Transportation Geotechnics最新文献

筛选
英文 中文
Dynamic behavior of volcanic ash of Tajogaite (La Palma, Canary Islands, Spain) 西班牙加那利群岛拉帕尔马Tajogaite火山的火山灰动力学行为
IF 4.9 2区 工程技术
Transportation Geotechnics Pub Date : 2025-07-25 DOI: 10.1016/j.trgeo.2025.101644
Svetlana Melentijević , Rubén Ruiz , Sol López-Andrés , Maria Eugenia Martín Baanante , José Estaire
{"title":"Dynamic behavior of volcanic ash of Tajogaite (La Palma, Canary Islands, Spain)","authors":"Svetlana Melentijević ,&nbsp;Rubén Ruiz ,&nbsp;Sol López-Andrés ,&nbsp;Maria Eugenia Martín Baanante ,&nbsp;José Estaire","doi":"10.1016/j.trgeo.2025.101644","DOIUrl":"10.1016/j.trgeo.2025.101644","url":null,"abstract":"<div><div>The dynamic characterization of soils is essential for the analysis of their dynamic behavior, soil-structure interaction under seismic loading, seismic design of the constructions to be built on them, soil failure and liquefaction analysis under seismic loading, etc. Dynamic laboratory tests are usually performed over reconstituted sandy material, and sometimes over undisturbed sandy specimens. In this paper the performance of a volcanic sandy material in its fresh natural state, without subsequent consolidation and cementation, is studied to determine its strain dependent shear modulus and damping ratio under range of shear strains considering its location in affected seismic areas. In this study, reconstituted samples in their dry state under different initial relative densities and applied vertical pressures are examined by densification tests performed by cyclic direct simple shear test analyzing vertical strains, shear modulus and damping ratios. The highest densification is observed during the application of the first 10 to 100 cycles. In general, the lowest shear modulus values are obtained for low values of applied vertical stress, and a decrease of damping ratio is observed with the increase of the application of cycles. Also, resonant column tests are performed under different effective confining pressures, observing the general trend of degradation of normalized shear modulus and the increase of damping ratio for the increase of shear strains, with the linear initial relation of shear modulus with shear strains in the range of small strains. The comparison of this non-linear dynamic behavior is performed to the usually applied relations for ordinary sandy materials, providing satisfactory adjustment in this case.</div></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":"54 ","pages":"Article 101644"},"PeriodicalIF":4.9,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144704436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spatio-temporal prediction of soil hydro-thermal response in embankment to the varying climatic conditions using a Two-Step LSTM-ML approach 基于两步LSTM-ML方法的路堤土壤水热响应时空预测
IF 5.5 2区 工程技术
Transportation Geotechnics Pub Date : 2025-07-22 DOI: 10.1016/j.trgeo.2025.101648
Ni An , Enze Xie , Yang Yu , Yongyong Yang , Qing Lv , Shuai Zhang , Wei Zhan , Yadong Wu
{"title":"Spatio-temporal prediction of soil hydro-thermal response in embankment to the varying climatic conditions using a Two-Step LSTM-ML approach","authors":"Ni An ,&nbsp;Enze Xie ,&nbsp;Yang Yu ,&nbsp;Yongyong Yang ,&nbsp;Qing Lv ,&nbsp;Shuai Zhang ,&nbsp;Wei Zhan ,&nbsp;Yadong Wu","doi":"10.1016/j.trgeo.2025.101648","DOIUrl":"10.1016/j.trgeo.2025.101648","url":null,"abstract":"<div><div>Soil hydro-thermal response is vital in the assessment of embankment stability, especially considering the increasing extreme climate events along with global climate change. Machine learning has emerged as a promising approach to estimate soil hydro-thermal dynamics. Current spatio-temporal prediction methods of soil hydro-thermal response faces significant challenges when applied to embankments, including the employment of remote sensing data with large-scale resolution, extensive datasets and high computational costs requested by layered modeling approaches. To address these limitations, this study develops a Two-Step LSTM-ML approach to predict the spatio-temporal variations of soil temperature and volumetric water content in embankments. The method is conducted in two steps: a Long Short-Term Memory (LSTM) model for the prediction of surface soil hydro-thermal response in step 1 and then combined with machine learning algorithms, e.g., Support Vector Regression (SVR), Random Forest (RF), and Artificial Neural Networks (ANN), to estimate the soil hydro-thermal response at various depths in step 2. The developed approach is trained and validated using measured data from July 6, 2011 to October 7, 2011 at the Héricourt embankment in France. The results demonstrate that the LSTM model effectively captures temporal variations in surface soil temperature and volumetric water content, while spatial mapping using RF and ANN models provides reliable predictions of soil variables at different depths. Additionally, this study examines the effects of different time-step and an iterative computation approach for surface soil variable prediction, further refining the model’s performance. The proposed method offers a robust and efficient framework for predicting soil temperature and volumetric water content in embankments, with potential applications for transportation infrastructure management and climate change adaptation.</div></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":"55 ","pages":"Article 101648"},"PeriodicalIF":5.5,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144721471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of Initial Stress Anisotropy on Small-Strain Properties of Fiber-reinforced Calcareous Sand 初始应力各向异性对纤维增强钙质砂小应变性能的影响
IF 4.9 2区 工程技术
Transportation Geotechnics Pub Date : 2025-07-21 DOI: 10.1016/j.trgeo.2025.101651
Mohammad Hassan Baziar , Mahdi Delavar , Yasser Jafarian
{"title":"Effect of Initial Stress Anisotropy on Small-Strain Properties of Fiber-reinforced Calcareous Sand","authors":"Mohammad Hassan Baziar ,&nbsp;Mahdi Delavar ,&nbsp;Yasser Jafarian","doi":"10.1016/j.trgeo.2025.101651","DOIUrl":"10.1016/j.trgeo.2025.101651","url":null,"abstract":"<div><div>This research presents the effects of using glass fibers as an eco-friendly additive on the small-strain properties of calcareous sand, commonly found in coastal and land reclamation areas. A series of resonant column tests were conducted on Hormoz calcareous sand, reinforced with randomly distributed glass fibers, under isotropic and anisotropic stress conditions. The results showed that glass fibers increased the small-strain shear modulus. Moreover, with increasing confining pressure, the optimal fiber content decreased from 2% to 1% (by weight). The damping ratio slightly decreased with 2% fiber content but increased with 1%. Overall, both shear modulus and damping ratio were increased with an appropriate amount of glass fiber reinforcement. The results of all tests indicated that initial stress anisotropy increased the shear modulus. However, fiber content and initial stress anisotropy had a negligible effect on the normalized shear modulus. In this study, an empirical relationship was also proposed to estimate the ratio between the maximum shear modulus under anisotropic and isotropic stress conditions. This relationship was validated using a comprehensive laboratory dataset, and it was found to depend only on the initial stress anisotropy and to be independent of confining pressure, fiber content, particle shape, or void ratio.</div></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":"54 ","pages":"Article 101651"},"PeriodicalIF":4.9,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144695292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Responses of karst-penetrating piles under active and passive loading: experimental and numerical investigation 主动和被动荷载作用下穿岩溶桩的响应:试验与数值研究
IF 4.9 2区 工程技术
Transportation Geotechnics Pub Date : 2025-07-20 DOI: 10.1016/j.trgeo.2025.101649
Wenzhe Peng , Xiaojie Jiang , Qin Zhu , Ling Zhang , Minghua Zhao , Dequan Zhou
{"title":"Responses of karst-penetrating piles under active and passive loading: experimental and numerical investigation","authors":"Wenzhe Peng ,&nbsp;Xiaojie Jiang ,&nbsp;Qin Zhu ,&nbsp;Ling Zhang ,&nbsp;Minghua Zhao ,&nbsp;Dequan Zhou","doi":"10.1016/j.trgeo.2025.101649","DOIUrl":"10.1016/j.trgeo.2025.101649","url":null,"abstract":"<div><div>This study, part of a preliminary safety evaluation for a real project, investigates the responses of karst-penetrating piles under active and passive loading, compared to non-cave cases. A series of reduced-scale model experiments and numerical simulations were conducted with a 1:35 similarity ratio, considering the effects of cave number and height on dimensionless pile responses. The results revealed that the decrease in axial force within and near the caves is due to the vertical resistance generated by the bulged pile segment, the pile-rock interface, and the cave bottom against the bulged pile segment. The deflection and bending moment profiles of karst-penetrating piles, which are significantly affected by pile head constraints, resemble those in non-cave cases, but with increased magnitudes as cave number and height rise. Additionally, reduced pile-rock contact shortens the effective pile length, preventing the shallow soil layer from providing sufficient lateral resistance. Consequently, deeper soil layers must mobilize their resistance to maintain lateral equilibrium. The effects of caves on pile responses depend on their position relative to the critical pile length of 4/<em>α</em>. Finally, pile head settlement and deflection exhibit a nearly linear positive relationship with both cave number and height. To simplify future predictions, several fitting formulas are proposed to link pile responses with and without karst caves. These formulas enable convenient prediction of the responses of karst-penetrating piles by scaling non-cave responses, reducing the need for extensive testing across various undetected cave scenarios.</div></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":"54 ","pages":"Article 101649"},"PeriodicalIF":4.9,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144679147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on the shear characteristics of undrained circulation of rubber sand under traffic load 交通荷载作用下橡胶砂不排水循环剪切特性研究
IF 4.9 2区 工程技术
Transportation Geotechnics Pub Date : 2025-07-18 DOI: 10.1016/j.trgeo.2025.101650
Xingmin Zheng , Jiawei Ji , Feiyu Liu , Weixiang Zeng
{"title":"Study on the shear characteristics of undrained circulation of rubber sand under traffic load","authors":"Xingmin Zheng ,&nbsp;Jiawei Ji ,&nbsp;Feiyu Liu ,&nbsp;Weixiang Zeng","doi":"10.1016/j.trgeo.2025.101650","DOIUrl":"10.1016/j.trgeo.2025.101650","url":null,"abstract":"<div><div>As a lightweight and environmentally friendly granular material, rubber-sand mixtures have been widely utilized in roadbed filling engineering due to their excellent vibration-damping performance. However, systematic and in-depth research on the dynamic response mechanisms of rubber–sand mixtures under traffic loading remains limited. In this study, hollow cylinder torsional shear tests were conducted to investigate the effects of varying rubber contents (0 %, 20 %, 40 %, and 60 %) on the dynamic shear characteristics of rubber sand subjected to traffic loading. Additionally, a three–dimensional discrete element method (DEM)–based undrained hollow cylinder torsional shear model was established to analyze the evolution of particle displacement, particle mechanical coordination number, strong chain percentage, and fabric anisotropy during the torsional shear process. The results indicate that at low and medium rubber contents (20 %, 40 %), liquefaction and reorganization of the particle skeleton trigger abrupt increases in axial strain and suppress the rebound effect. Meanwhile, horizontal shear–band reorientation accelerates axial strain accumulation. Under these conditions, as rubber content increases, the damping ratio rises linearly, while the shear modulus decreases. At the microscopic level, the particle contact network experiences a reduction in the ratio of mechanical coordination numbers and strong force chains, accompanied by an accelerated decay of normal contact forces in the vertical direction. However, when the rubber content reaches 60 %, the elastic continuous phase formed by densely packed rubber particles stabilizes the strain field and suppresses displacement localization, enhancing stiffness. Microscopically, the number of normal contacts increases, the percentage of strong chains stabilizes, and the rate of decay of vertical normal contact forces is significantly reduced.</div></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":"54 ","pages":"Article 101650"},"PeriodicalIF":4.9,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144679146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Direct shear behavior of ballasts under differential cyclic normal loading conditions 差动循环法向载荷条件下压舱物的直剪特性
IF 4.9 2区 工程技术
Transportation Geotechnics Pub Date : 2025-07-16 DOI: 10.1016/j.trgeo.2025.101647
Wengang Dang , Xingling Li , Hongfei Duan , Junpeng Zou , Kang Tao , Linchong Huang , Wenhao Zhang , Yuyong Jiao
{"title":"Direct shear behavior of ballasts under differential cyclic normal loading conditions","authors":"Wengang Dang ,&nbsp;Xingling Li ,&nbsp;Hongfei Duan ,&nbsp;Junpeng Zou ,&nbsp;Kang Tao ,&nbsp;Linchong Huang ,&nbsp;Wenhao Zhang ,&nbsp;Yuyong Jiao","doi":"10.1016/j.trgeo.2025.101647","DOIUrl":"10.1016/j.trgeo.2025.101647","url":null,"abstract":"<div><div>Ballast is a common construction material, which often faces complex stress disturbances from nature and human activities. In this study, we conducted a series of direct shear tests on ballasts under constant and differential cyclic normal stresses. The effects of normal loading/unloading timespan ratios (<em>ξ</em>), applied peak normal stresses (<em>σ</em><sub>p</sub>), and shear rates (<em>v</em>) were explored. We found that the normal loading and unloading stiffness is related to <em>ξ</em>, <em>σ</em><sub>p</sub>, and <em>v</em>. Also, as <em>ξ</em>, <em>σ</em><sub>p</sub>, and <em>v</em> increase, the peak shear stress increases. The changing pattern of the time lag between the peak normal stress and peak shear stress is only related to <em>ξ</em>. When <em>ξ</em> ≤ 1/1, the peak shear stress lags behind the peak normal stress, showing dynamic weakening of shear strength. When <em>ξ</em> &gt; 1/1, the peak shear stress and peak normal stress occur simultaneously, showing dynamic strengthening of shear strength. Moreover, it always shows dynamic strengthening for different <em>σ</em><sub>p</sub>, while increasing <em>v</em> makes the shear strength transitions from dynamic weakening to dynamic strengthening. In the normal stress loading stage, the shear stress increases linearly, whereas in the normal stress unloading stage, the shear stress curves exhibit non-linear evolutions, resulting in differences in the slope coordination between the shear stress and normal stress. Our findings provide valuable insights into mechanical behavior of ballasts under irregular stress disturbance, aiding in mitigating associated risks in railway engineering.</div></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":"54 ","pages":"Article 101647"},"PeriodicalIF":4.9,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144654830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Evaluation of dynamic stress behavior in CRTS III slab track subjected to differential subgrade settlement and temperature gradient 不同地基沉降和温度梯度作用下CRTS III型平板轨道动应力特性评价
IF 4.9 2区 工程技术
Transportation Geotechnics Pub Date : 2025-07-16 DOI: 10.1016/j.trgeo.2025.101632
Xi Wang , Qingyuan Xu , Shengwei Sun , Bin Li , Qi Wei , Hao Sun
{"title":"Evaluation of dynamic stress behavior in CRTS III slab track subjected to differential subgrade settlement and temperature gradient","authors":"Xi Wang ,&nbsp;Qingyuan Xu ,&nbsp;Shengwei Sun ,&nbsp;Bin Li ,&nbsp;Qi Wei ,&nbsp;Hao Sun","doi":"10.1016/j.trgeo.2025.101632","DOIUrl":"10.1016/j.trgeo.2025.101632","url":null,"abstract":"<div><div>The CRTS III slab track operates in a complex environment where differential subgrade settlement (DSS) and temperature gradient (TG) significantly affect its mechanical properties and geometry, thereby impacting track durability and train safety. A train-CRTS III slab track-subgrade coupled dynamic model considering the contact nonlinearity is developed. Taking the state of track structure caused by DSS and TG as the initial condition, the combined effects of DSS and TG on the dynamic stress behavior in CRTS III slab track under moving train are explored. Results show that DSS causes sharp peaks in initial mechanical responses within the DSS region, while TG induces cyclic fluctuations across the entire track. Under combined loads, the moving train induces the greatest amplification in fastener compression force (increasing by 5.51 times), and the least amplification in base plate (BP) tensile stress (increasing by 0.11 times), relative to their initial values. The tensile stress in BP is primarily influenced by DSS, while the pressure stress on BP is predominantly affected by TG, and other indicators are influenced by both DSS and TG. DSS and TG significantly affect track structures, with composite slab failing when DSS exceeds 12.5 mm, BP failing when DSS exceeds 11 mm, and fasteners and subgrade requiring both high DSS and TG for failure. This research provides critical insights into track design and maintenance strategies to ensure the stability and safety of high-speed railway systems under dynamic loading conditions.</div></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":"54 ","pages":"Article 101632"},"PeriodicalIF":4.9,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144687565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Deformation of tunnel surrounding soil under traffic loads considering Bi-directional PSR 考虑双向PSR的交通荷载下隧道周围土体变形
IF 4.9 2区 工程技术
Transportation Geotechnics Pub Date : 2025-07-16 DOI: 10.1016/j.trgeo.2025.101621
Weipin Wu , Yung-Tsang Chen , Dariusz Wanatowski , Juntian Wang , Xiang Li
{"title":"Deformation of tunnel surrounding soil under traffic loads considering Bi-directional PSR","authors":"Weipin Wu ,&nbsp;Yung-Tsang Chen ,&nbsp;Dariusz Wanatowski ,&nbsp;Juntian Wang ,&nbsp;Xiang Li","doi":"10.1016/j.trgeo.2025.101621","DOIUrl":"10.1016/j.trgeo.2025.101621","url":null,"abstract":"<div><div>Under complex loading condition such as train-induced traffic loads, the foundation soil of transportation infrastructure experiences Bi-directional Principal Stress Rotation (PSR). Ignoring Bi-directional PSR may lead to an underestimation of the soil’s long-term deformation. However, due to the limitations in test equipment, current research predominantly focuses on considering only Uni-directional PSR. To tackle such challenge, this research first used the Finite Element Method (FEM) to obtain the stress paths in the soil around the tunnel under subway traffic loads, including the Bi-directional PSR. Based on these paths, Bi-directional dynamic simple shear tests on Leighton Buzzard sand were conducted. The axial and shear deformation, axial resilient modulus, and shear modulus under Bi-directional PSR were investigated. Results indicated that, under Bi-directional PSR, the vertical deformation of the soil under the tunnel was larger than that under Uni-directional PSR. In particular, the vertical deformation in the soil at few meters away from the centerline of the tunnel was larger than that at the centerline. Therefore, in prediction of vertical deformation of the surrounding soil of the tunnel subjected to long-term traffic loads, considering Bi-directional PSR provides more accurate results. This work provides valuable insights into the mechanical behavior of the subsoil of the tunnel under train-induced traffic loads.</div></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":"54 ","pages":"Article 101621"},"PeriodicalIF":4.9,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144654826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Discrete element analysis of the influence of sleeper longitudinal creeping on the degradation of ballast bed lateral resistance 轨枕纵向爬行对道床横向阻力退化影响的离散元分析
IF 4.9 2区 工程技术
Transportation Geotechnics Pub Date : 2025-07-14 DOI: 10.1016/j.trgeo.2025.101645
Xuhao Cui , Yapeng Liu , Yang Xu , Yi Li , Zhihai Zhang , Yang Wang , Yunhao Gao
{"title":"Discrete element analysis of the influence of sleeper longitudinal creeping on the degradation of ballast bed lateral resistance","authors":"Xuhao Cui ,&nbsp;Yapeng Liu ,&nbsp;Yang Xu ,&nbsp;Yi Li ,&nbsp;Zhihai Zhang ,&nbsp;Yang Wang ,&nbsp;Yunhao Gao","doi":"10.1016/j.trgeo.2025.101645","DOIUrl":"10.1016/j.trgeo.2025.101645","url":null,"abstract":"<div><div>With the continuous expansion of mountainous railway networks, the stability challenges posed by longitudinal sleeper creeping in steep-gradient sections of continuous welded rail systems have become increasingly prominent. This study addresses the lateral resistance degradation of ballast beds induced by gradient-directional sleeper creeping. A refined three-dimensional sleeper-ballast bed coupling model was developed using the discrete element method, enabling coupled simulations of multi-stage longitudinal displacement loading and lateral resistance testing. The investigation systematically elucidates cross-scale mechanisms governing lateral resistance characteristics, mesoscopic contact redistribution, and ballast migration patterns under creeping conditions. Key findings reveal that longitudinal displacements reduce lateral resistance by 2.40 kN during the initial loading phase (0–1.0 mm lateral displacement) through weakened sleeper-base constraints and intensified leading-side friction. The resistance evolution exhibits triphasic behavior: differentiated growth phase (2.40 kN inter-case disparity), differential attenuation phase (disparity reduced to 1.22 kN), and stabilized equilibrium phase (0.66 kN residual difference). Longitudinal creeping fundamentally redistributes lateral resistance components, decreasing the sleeper-base contribution from 57 % (0 mm creeping) to 22 % (5 mm creeping) while increasing leading-side participation from 14 % to 53 % via enhanced ballast compaction. The asymmetric disturbance pattern amplifies particle migration in leading-side crib zones during lateral loading, creating pronounced spatial heterogeneity detrimental to ballast bed uniformity and stability. These findings establish a theoretical framework for optimizing CWR anti-buckling designs and implementing scientific maintenance strategies in steep-gradient railway sections.</div></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":"54 ","pages":"Article 101645"},"PeriodicalIF":4.9,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144654772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Theoretical analysis of adaptive precise control of high-speed railway track under the action of fault dislocation 断层位错作用下高速铁路轨道自适应精确控制的理论分析
IF 4.9 2区 工程技术
Transportation Geotechnics Pub Date : 2025-07-14 DOI: 10.1016/j.trgeo.2025.101646
Hongliang Tu , Hui Zhou , Mingming Hu , Jun Zheng , Yang Gao , Hongbin Xu , Liu Yang , Chengwei Zhao
{"title":"Theoretical analysis of adaptive precise control of high-speed railway track under the action of fault dislocation","authors":"Hongliang Tu ,&nbsp;Hui Zhou ,&nbsp;Mingming Hu ,&nbsp;Jun Zheng ,&nbsp;Yang Gao ,&nbsp;Hongbin Xu ,&nbsp;Liu Yang ,&nbsp;Chengwei Zhao","doi":"10.1016/j.trgeo.2025.101646","DOIUrl":"10.1016/j.trgeo.2025.101646","url":null,"abstract":"<div><div>The operational deformation tolerance of high-speed railways demands millimeter-scale precision, which starkly contrasts with the meter-scale fault displacements commonly observed in seismic events. Resolving this critical conflict between infrastructure resilience and tectonic deformation remains fundamental to ensuring railway safety. On 8 January 2022, a magnitude M6.9 earthquake (epicentral depth: 10 km; seismic intensity: IX) struck Menyuan County, Qinghai Province, China. This event induced significant fault dislocation that severely damaged the Daliang tunnel on the Lanzhou-Xinjiang high-speed railway, leading to track warping deformation. Aiming at the adaptive precise control of high-speed railway track under fault dislocation, the research was conducted using the Daliang tunnel as an engineering case study. Key findings include: (1) The theory and technology of the trajectory adaptive precise control under strike-slip fault dislocation are established, with the motion trajectory equations of bearing center and boundary tangent points derived. (2) Based on the project’s actual dimensions, a 1:10 scale-down model of the control device was fabricated, followed by physical simulation tests to validate the accuracy of the regulation theory. (3) Parametric analysis identifies the distinct geometric effects of bearing radius, bevel gear radius, initial moment arm, and lead screw stroke on the sliding groove curve. Comparative analysis reveals that the condition that the initial force arm multiplied by the transmission coefficient equals 1 yields the optimal sliding groove geometry, achieving simultaneous reductions in structural thrust and bending moment while maintaining bearing mobility through minimized curvature discontinuities. These findings play an important supporting role in the high-quality construction of high-speed railways.</div></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":"54 ","pages":"Article 101646"},"PeriodicalIF":4.9,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144662018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信