Transportation Geotechnics最新文献_第7页

Thermo-mechanical response of sand-silt mixtures 砂-淤泥混合物的热机械响应

IF 4.9 2区工程技术

Transportation Geotechnics Pub Date : 2024-09-01 DOI: 10.1016/j.trgeo.2024.101342

引用次数: 0

An analytical model for permeability coefficient of soil-structure interface composed of different capillaries 由不同毛细管组成的土壤-结构界面渗透系数分析模型

IF 4.9 2区工程技术

Transportation Geotechnics Pub Date : 2024-09-01 DOI: 10.1016/j.trgeo.2024.101352

{"title":"An analytical model for permeability coefficient of soil-structure interface composed of different capillaries","authors":"","doi":"10.1016/j.trgeo.2024.101352","DOIUrl":"10.1016/j.trgeo.2024.101352","url":null,"abstract":"<div><p>The soil-structure interface, representing the contact surface between soil and structures such as buildings or rocks, assumes critical importance in water-related projects like earth dams, cut-off walls, side slopes, foundation pits, and water tunnels. Monitoring reports and studies consistently identify this interface as a vulnerable zone susceptible to seepage-related accidents. Despite this recognition, research on the topic has been limited, with a predominant focus on experimental methods that tend to underestimate permeability. This paper presents an analytical model, grounded in capillary theory, for calculating the permeability coefficient of the soil-structure interface. The study explores the differences in permeability between the interfacial soil and far-field soil. The study concludes that the higher porosity of the interfacial soil (porosity ≥ 0.48) compared to the far-field soil (porosity: 0.26–0.48) is a key factor in rendering the soil-structure interface susceptible to seepage. The calculated permeability coefficient of the interface, in relation to experimental values, exhibits a consistent ratio of 2.5–2.6 when the soil porosity is below 0.43, indicating reliable predictive utility. Moreover, the permeability coefficient of the interfacial soil proves to be at least 4.05–6.67 times larger than that of the far-field soil, potentially leading to the creation of preferential seepage channels at the interface.</p></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142117547","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

Pre- and Post-Improvement Performance of a Railway Embankment Stabilized with Ductile Inclusions 用延展性夹杂物稳定的铁路路堤的改进前和改进后性能

IF 4.9 2区工程技术

Transportation Geotechnics Pub Date : 2024-08-27 DOI: 10.1016/j.trgeo.2024.101362

{"title":"Pre- and Post-Improvement Performance of a Railway Embankment Stabilized with Ductile Inclusions","authors":"","doi":"10.1016/j.trgeo.2024.101362","DOIUrl":"10.1016/j.trgeo.2024.101362","url":null,"abstract":"<div><p>Large deflections and accumulation of permanent track geometry defects at railway soft spots cause significant operational issues including increased maintenance costs, decreased train speed, and, at an extreme, derailments and track failures. Reinforcing inclusions placed between the ties are a promising rehabilitation scheme to locally stabilize the embankment and transfer the loads to deeper, more suitable soils. In this paper we report the results of a long-term monitoring program to assess the performance of ductile inclusions, known commercially as “GeoSpike® elements”, to stabilize a rapidly deteriorating railway soft spot. Observations of track bed behavior are presented for 8 months prior to installation and 15 months after installation using a combination of LIDAR, Digital Image Correlation (DIC), and ShapeAccelArrays (SAA). Through the monitoring program, it was determined that the ductile inclusions decreased the average rate of deterioration by a factor of approximately 3, which allowed the frequency of site maintenance to be decreased from three times a year to once a year.</p></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2214391224001831/pdfft?md5=dabb1b873a290ec8a623690beb6a6e62&pid=1-s2.0-S2214391224001831-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142084117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Explicit consideration of geomaterial uncertainties in the load resistance factor design of piles driven into rock-based intermediate geomaterials 在设计打入岩基中间岩土材料的桩时明确考虑岩土材料的不确定性

IF 4.9 2区工程技术

Transportation Geotechnics Pub Date : 2024-08-23 DOI: 10.1016/j.trgeo.2024.101358

{"title":"Explicit consideration of geomaterial uncertainties in the load resistance factor design of piles driven into rock-based intermediate geomaterials","authors":"","doi":"10.1016/j.trgeo.2024.101358","DOIUrl":"10.1016/j.trgeo.2024.101358","url":null,"abstract":"<div><p>The study presents a method for estimating the end bearing of piles driven into rock-based intermediate geomaterials (IGMs). Existing design methods, rooted in soil mechanics, often fall short when applied to IGMs. Moreover, the geomaterial (geological and ground properties) uncertainties are neglected and the piles are designed based on subsurface information from distant boreholes. To address this gap, the study introduces an approach that explicitly considers geomaterial uncertainties by combining empirical models and geostatistical simulation to predict end bearing. Using data from 87 piles driven into various rock-based IGMs with dynamic load testing as the construction control technique, this study introduces the Proposed Design Method (PDM) for the prediction of end bearing. PDM is compared to the Current Design Method (CDM), which is based on traditional soil-mechanics methods. Predictions from these methods are subsequently evaluated against the measured end bearings. The results demonstrate that while the PDM yields comparable predictions to the CDM, it offers a more robust consideration of geomaterial uncertainties. The PDM leads to an approximate 13.60% to 19.35% increase in uncertainties compared to CDM across various IGMs. These findings advance the understanding of pile behavior in the presence of geomaterial uncertainties and inherent variability.</p></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142076294","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

Dynamic response of dry sands subjected to dual patch impact loads of a wheeled helicopter 干沙在轮式直升机双片冲击载荷作用下的动态响应

IF 4.9 2区工程技术

Transportation Geotechnics Pub Date : 2024-08-22 DOI: 10.1016/j.trgeo.2024.101345

{"title":"Dynamic response of dry sands subjected to dual patch impact loads of a wheeled helicopter","authors":"","doi":"10.1016/j.trgeo.2024.101345","DOIUrl":"10.1016/j.trgeo.2024.101345","url":null,"abstract":"<div><p>Dual patch impact loads are applied through two tires attached to a single landing gear during the landing of wheeled helicopters. To investigate the dynamic response of dry sands under dual patch impact loads from wheeled helicopters, model tests and validated numerical simulations were performed. The findings reveal that the settlement pattern in the shallow sand layer exhibits a characteristic W-shape, with the maximum settlement occurring directly beneath the center of each tamper. The time-history curve of the vertical dynamic pressure along the centerline of each tamper shows a single peak pulse with a duration of approximately 0.01 s. The peak value diminishes with increasing depth. Both the settlement and dynamic vertical soil pressure are dependent on impact energy, increasing as impact energy rises. The center-to-center spacing between the two tampers has a minimal effect on the maximum settlement and peak dynamic soil pressure along the centerline of each tamper. However, it significantly affects the maximum settlement and peak dynamic soil pressure along the centerline between the two tampers. As the spacing increases, the maximum settlement and peak dynamic soil pressure along the centerline between the two tampers decrease due to the attenuation of interaction between the two tampers.</p></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142076293","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

Experimental study on backward erosion piping of a double-layer dike foundation under variable exit geometries 出口几何形状可变条件下双层堤基逆向侵蚀管道的试验研究

IF 4.9 2区工程技术

Transportation Geotechnics Pub Date : 2024-08-22 DOI: 10.1016/j.trgeo.2024.101353

{"title":"Experimental study on backward erosion piping of a double-layer dike foundation under variable exit geometries","authors":"","doi":"10.1016/j.trgeo.2024.101353","DOIUrl":"10.1016/j.trgeo.2024.101353","url":null,"abstract":"<div><p>Double-layer dike foundation is composed of a weakly permeable overlying clay layer and a highly permeable underlying sand layer, which is one of the most common stratum types in dike engineering with the highest probability of catastrophic damage, and the main danger is backward erosion piping. Existing research on backward erosion piping of double-layer dike foundation has not fully considered the influence of the exit on the erosion process. Therefore, a self-designed test device is used to assess the influences of the size, position and type of different exits, and the circular exit is connected with the slot exit via the exit area to explore the critical identification conditions and the pipe development mechanism toward the upstream direction under different exit geometry conditions. The results show that both the local and global hydraulic gradients borne by the exit are inversely proportional to the exit area and are less notably affected by the location of the exit. The development process of slot exit pipes differs from that of circular exit pipes, and pipes are usually developed alternately at the two corners of the exit near the upstream end and then converge into one pipe. The average pipe depth and width are proportional to the exit size and the seepage length. With increasing average pipe area of the slot exit, pipes develop more rapidly after head enhancement, and the damage to the dike foundation increases.</p></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142048950","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

Calculation method for static and seismic active earth pressure on counterweight retaining walls under translation based on two critical slip surfaces 基于两个临界滑移面的平移作用下配重挡土墙的静力和地震活动土压力计算方法

IF 4.9 2区工程技术

Transportation Geotechnics Pub Date : 2024-08-22 DOI: 10.1016/j.trgeo.2024.101349

{"title":"Calculation method for static and seismic active earth pressure on counterweight retaining walls under translation based on two critical slip surfaces","authors":"","doi":"10.1016/j.trgeo.2024.101349","DOIUrl":"10.1016/j.trgeo.2024.101349","url":null,"abstract":"<div><p>The counterweight retaining wall with polyline wall back is a kind of gravity walls, which can be alternatively used in high embankments. To completely analyze active earth pressure on the polyline back under the wall translation mode, a comprehensive method is proposed based on two planar slip surfaces in the retained soil, an inclined slice method within the frame of limit equilibrium, and the pseudo-static approach. Meanwhile, the two critical slip surfaces include the global and local ones in the soils behind the whole wall and only the upper wall, respectively; and mobilized shear strength coefficients on interslice surfaces are introduced to fully consider the interslice shear forces. Some examples show that the proposed resultant forces on the whole wall are close to the experimental and numerical results generally within 10% error. The dip angle of backfill surface has a significant effect on the two slip surfaces, and the inclination of the lower back mostly influences the global slip surface. The unloading effect of the platform on the lower earth pressure becomes obvious as the upper wall lengthens under a constant height of the whole wall. The magnitude and profile of the seismic earth pressure on the polyline back are greatly influenced by the seismic coefficients.</p></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142076292","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

How to identify earth pressures on in-service tunnel linings: Insights from Bayesian inversion to address non-uniqueness 如何确定在役隧道衬砌的土压力：贝叶斯反演对解决非唯一性问题的启示

IF 4.9 2区工程技术

Transportation Geotechnics Pub Date : 2024-08-22 DOI: 10.1016/j.trgeo.2024.101344

{"title":"How to identify earth pressures on in-service tunnel linings: Insights from Bayesian inversion to address non-uniqueness","authors":"","doi":"10.1016/j.trgeo.2024.101344","DOIUrl":"10.1016/j.trgeo.2024.101344","url":null,"abstract":"<div><p>Identifying earth pressures on in-service transportation tunnel linings is essential for their health monitoring and performance prediction, particularly in structures that exhibit poor performance. Due to the high costs associated with pressure gauges, pressure inversion based on easily observed structural responses, such as deformations, is preferred. A significant challenge lies in the non-uniqueness of inversion results, where various pressures can yield similar structural responses. Existing approaches often overlook detailed discussions on this critical issue. In addressing this gap, this study introduces a Bayesian approach. The proposed statistical framework effectively quantifies the uncertainty induced by non-uniqueness. Further analysis identifies the uniform component in distributed pressures as the primary source of non-uniqueness. Insights into mitigation strategies are provided, including increasing the quantity of deformation data or incorporating an observation of internal normal force within the tunnel lining — the latter proving to be notably more effective. A practical application in a numerical case study demonstrates the effectiveness of this approach. In addition, our investigation recommends maintaining deformation measurement accuracy within the range of [–1, 1] mm to ensure satisfactory outcomes. Finally, deficiencies and potential future extensions of this approach are discussed.</p></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142048951","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

Experimental study on tunneling-induced soil arching evolution in pile-raft foundations 隧道工程诱发桩筏地基土拱演变的实验研究

IF 4.9 2区工程技术

Transportation Geotechnics Pub Date : 2024-08-22 DOI: 10.1016/j.trgeo.2024.101340

{"title":"Experimental study on tunneling-induced soil arching evolution in pile-raft foundations","authors":"","doi":"10.1016/j.trgeo.2024.101340","DOIUrl":"10.1016/j.trgeo.2024.101340","url":null,"abstract":"<div><p>The evolution and progressive failure of the tunneling-induced soil arching effect in pile-raft foundations are still unclear. A series of tunnel-shaped trapdoor tests in a pile−raft foundation were conducted to study the effects of the tunnel−pile distance and the load on the subgrade surface on the progressive failure of the tunneling-induced soil arching effect. PIV technology was used to measure the evolution of the deformation pattern and shear bands of foundation soil with increasing tunnel volume loss. The ground reaction curve (GRC) for the tunnels and the pile settlement were measured by using a load cell and LVDTs. The results revealed that the minimum tunnel pressure in the pile-raft foundation was greater than that in the greenfield foundation because of the lower soil arching effect. The GRC curve in the pile−raft foundation can be divided into three stages: initial arching, maximum arching, and the ultimate stage. The minimum soil arching ratio decreased with increasing tunnel−pile distance and surface load. In the pile-raft foundation, a triangular disturbed zone was observed above the tunnel crown in the initial stage and gradually developed upward within a rectangular zone as the tunnel volume loss increased. The width of the tunneling-disturbed area was larger than the tunnel diameter in the ultimate stage. As the tunnel−pile distance increased, the evolution pattern of the tunnel-induced loosened area changed from “triangular expanding expansion” to “equal settlement expansion”. The effects of the tunnel−pile distance and surface loads on the tunneling-induced failure mechanism of pile−raft foundations are also discussed in this study, which provides valuable guidance for underground engineering construction.</p></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142087885","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

Digital reconstruction of railway steep slope from UAV+TLS using geometric transformer 利用几何变换器从无人机+TLS 对铁路陡坡进行数字重建

IF 4.9 2区工程技术

Transportation Geotechnics Pub Date : 2024-08-22 DOI: 10.1016/j.trgeo.2024.101343

{"title":"Digital reconstruction of railway steep slope from UAV+TLS using geometric transformer","authors":"","doi":"10.1016/j.trgeo.2024.101343","DOIUrl":"10.1016/j.trgeo.2024.101343","url":null,"abstract":"<div><p>Accurate representation of railway slopes, especially those that are steep, is vital for real-time risk perception. Also, temporary structures also present certain safety hazards due to lack of monitoring. Traditional point cloud modeling, employing Unmanned Aerial Vehicle (UAV) or Terrestrial Laser Scanning (TLS), often struggles to simultaneously account for the precision of both surface and overhead models, leading to considerable model distortion, roughness, and deviation. Addressing these issues, A new 3D point cloud modeling algorithm for railway slopes based on a geometric transformer is presented in this paper. This involves an innovative rough point cloud denoising technique leveraging adaptive segmentation, multi-scale denoising, and deep learning point cloud registration. Our approach significantly enhances UAV point cloud accuracy and supplements missing portions of the TLS point cloud dataset occluded by objects block, using data from the UAV point cloud set. An experimental study shows that the score-based denoising algorithm improves precision from 37.44 mm to 8.11 mm for a UAV 3D point cloud. Further, by registering the UAV and TLS point cloud sets using the Geometric Transformer algorithm, the precision of the 3D point cloud was further augmented to 5.11 mm, representing a sevenfold enhancement over the initial UAV point cloud accuracy prior to denoising. Consequently, a high-fidelity 3D point cloud model of steep railway slopes has been created.</p></div>","PeriodicalId":56013,"journal":{"name":"Transportation Geotechnics","volume":null,"pages":null},"PeriodicalIF":4.9,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142084116","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