Acta Geotechnica最新文献_第6页

Particle-morphology-based characterization of the breakage behavior of particle assemblies under one-dimensional compression

IF 5.6 1区工程技术

Acta Geotechnica Pub Date : 2024-11-26 DOI: 10.1007/s11440-024-02466-x

Yihang Wu, Beibing Dai, Kangle Xu, Pei Liu, Yang Wu, Jiankun Liu

{"title":"Particle-morphology-based characterization of the breakage behavior of particle assemblies under one-dimensional compression","authors":"Yihang Wu, Beibing Dai, Kangle Xu, Pei Liu, Yang Wu, Jiankun Liu","doi":"10.1007/s11440-024-02466-x","DOIUrl":"10.1007/s11440-024-02466-x","url":null,"abstract":"<div><p>In this study, a series of one-dimensional compression tests are conducted to study the particle breakage behavior of carbonate sands, with a focus on the effect of particle grading. Advanced image processing techniques (i.e., the QICPIC imaging system and the X-ray micro-tomography) are employed to analyse the particle crushing phenomenon by tracing the evolution of particle morphology features which include the particle size and shape. The results show that particle shape tends to become more irregular with increasing overburden pressure. The evolution of the cumulative distribution of overall particle shape index (overall regularity, <i>OR</i>) will reach a steady state, which is analogous to the evolution of particle size distribution during the compression process. A new shape-dependent particle breakage index, termed relative shape breakage index (<i>S</i><sub>r</sub>), has been proposed to quantify the breakage degree, and its correlation with the particle size-dependent breakage index is analysed. Finally, the X-ray micro-tomography (μCT) data are utilized to explore the shape variation of child particles during the fragmentation of a single particle from a micromechanical perspective. The particle size effect on the breakage behavior of particle assemblies under one-dimensional compression is also schematically clarified.</p></div>","PeriodicalId":49308,"journal":{"name":"Acta Geotechnica","volume":"20 4","pages":"1813 - 1830"},"PeriodicalIF":5.6,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Development of pore water pressure in anisotropically consolidated sand under cyclic torsional loading

IF 5.6 1区工程技术

Acta Geotechnica Pub Date : 2024-11-25 DOI: 10.1007/s11440-024-02487-6

Futang Zhao, Zhijian Qiu, Yewei Zheng, Qixin Wu

{"title":"Development of pore water pressure in anisotropically consolidated sand under cyclic torsional loading","authors":"Futang Zhao, Zhijian Qiu, Yewei Zheng, Qixin Wu","doi":"10.1007/s11440-024-02487-6","DOIUrl":"10.1007/s11440-024-02487-6","url":null,"abstract":"<div><p>The development of pore water pressure plays a vital role in the evaluation of liquefaction resistance of sand. Sand in situ is typically anisotropically consolidated due to gravitational deposition and external loading. However, the influence of anisotropic consolidation stress state on the development of pore water pressure in sand has not been adequately investigated. In this study, a series of cyclic torsional shear tests were carried out using hollow cylinder apparatus for a broad range of initial anisotropic consolidation stress states and cyclic shear stress levels. The experimental results indicate that the consolidation stress-induced anisotropy leads to three different modes for the development of pore water pressure. A relationship between the pore water pressure at failure and generalized deviatoric strain is established, which enables the prediction of excess pore water pressure at failure for a broad range of anisotropic consolidation stress states. A prediction model that describes the evolution pattern of the excess pore water pressure ratio against the number of cycles is proposed. This model can capture the three different development patterns of excess pore water pressure considering the anisotropic consolidation stress state. The failure criterion defined by pore water pressure considering the influence of anisotropic consolidation is discussed.</p></div>","PeriodicalId":49308,"journal":{"name":"Acta Geotechnica","volume":"20 4","pages":"1703 - 1721"},"PeriodicalIF":5.6,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

CASM-U: a unified critical state model for unsaturated clays and sands CASM-U：非饱和粘土和砂土的统一临界状态模型

IF 5.6 1区工程技术

Acta Geotechnica Pub Date : 2024-11-24 DOI: 10.1007/s11440-024-02462-1

Pei-Zhi Zhuang, En-Ci Sun, Jia-Liang Zhang, Ze-Xiang Wu, Hai-Sui Yu, He Yang

{"title":"CASM-U: a unified critical state model for unsaturated clays and sands","authors":"Pei-Zhi Zhuang, En-Ci Sun, Jia-Liang Zhang, Ze-Xiang Wu, Hai-Sui Yu, He Yang","doi":"10.1007/s11440-024-02462-1","DOIUrl":"10.1007/s11440-024-02462-1","url":null,"abstract":"<div><p>This paper proposes a coupled hydro-mechanical constitutive model for unsaturated clay and sand (CASM-U) in a critical state framework. The mechanical behaviour of unsaturated soils is modelled by modifying the unified clay and sand model (CASM) with Bishop’s effective stress, bounding surface concept and loading collapse (LC) yield surface. The hydraulic behaviour is described by a soil–water characteristic curve (SWCC) with nonlinear scanning law, considering the coupled effects of soil deformation and hysteresis. CASM-U is implemented into a commercial finite element software through the user-defined material subroutine (UMAT), and the implementation is benchmarked by a new semi-analytical cavity expansion solution adopting CASM-U. Finally, the performance of CASM-U in predicting hydro-mechanical behaviour of unsaturated clays and sands is examined by comparing with experimental data from tests along various loading paths, including isotropic compression, cyclic drying–wetting, triaxial shearing, and their combinations. It is shown that CASM-U can provide reasonable predictions for hydro-mechanical behaviour of unsaturated soils with a total of 15 material parameters.</p></div>","PeriodicalId":49308,"journal":{"name":"Acta Geotechnica","volume":"20 1","pages":"211 - 230"},"PeriodicalIF":5.6,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142962959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Deciphering the dynamics of debris flows through basal stress responses in model experiments

IF 5.6 1区工程技术

Acta Geotechnica Pub Date : 2024-11-24 DOI: 10.1007/s11440-024-02461-2

Cong-jiang Li, Yu-Xiang Hu, Hai-bo Li, Jia-wen Zhou

{"title":"Deciphering the dynamics of debris flows through basal stress responses in model experiments","authors":"Cong-jiang Li, Yu-Xiang Hu, Hai-bo Li, Jia-wen Zhou","doi":"10.1007/s11440-024-02461-2","DOIUrl":"10.1007/s11440-024-02461-2","url":null,"abstract":"<div><p>Comprehending the basal stress and stress fluctuations of debris flows at their boundaries and understanding how these effects influence the dynamics of debris flows are crucial for disaster reduction. In this study, a series of physical model experiments were conducted with varying initial conditions to investigate the basal stress responses and dynamic behaviors of debris flow. Experimental results show that the basal stress at the contact surface of debris flow is significantly influenced by material composition and slope. Specifically, an increase in gravel fraction and slope lead to enhanced basal normal and shear stresses, whereas higher water content exerts the opposite effect. Additionally, the fluctuating stress in normal stress is primarily influenced by material composition, particularly the proportion of coarser materials. Notably, particle agitation is linked to the inertial stress within the debris flow, exhibiting a positive correlation. Enhanced particle agitation facilitates the sparse and vigorous movement of debris flow, further promoting its development. Lastly, a method for predicting flow resistance in debris flow based on macro-scale stress fluctuation monitoring is proposed, providing valuable insights for disaster prevention and mitigation strategies.</p></div>","PeriodicalId":49308,"journal":{"name":"Acta Geotechnica","volume":"20 4","pages":"1777 - 1794"},"PeriodicalIF":5.6,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

A weight combination anisotropic strength criterion considering the effect of joint orientation

IF 5.6 1区工程技术

Acta Geotechnica Pub Date : 2024-11-23 DOI: 10.1007/s11440-024-02467-w

Qingci Qin, Kegang Li, Mingliang Li, Shunchuan Wu, Naeem Abbas, Rui Yue

{"title":"A weight combination anisotropic strength criterion considering the effect of joint orientation","authors":"Qingci Qin, Kegang Li, Mingliang Li, Shunchuan Wu, Naeem Abbas, Rui Yue","doi":"10.1007/s11440-024-02467-w","DOIUrl":"10.1007/s11440-024-02467-w","url":null,"abstract":"<div><p>In natural geological bodies, many sedimentary or metamorphic rocks exhibit significant bedding or cleavage characteristics. Such rocks show remarkable anisotropy and nonlinearity in mechanical behavior. Therefore, the strength theory of isotropic homogeneous bodies is difficult to meet the design requirements of this type of rock mass engineering. In particular, there are few reports on the research of anisotropic strength criteria under multiaxial stress, which seriously affects the safety of underground rock mass engineering construction and design. The spatial relationship between weak planes and principal stresses is the key to the anisotropy of the mechanical properties of jointed rock masses. In view of this, this paper deduces the strength criterion of layered rock masses under multiaxial stress by analyzing the normal stress and shear stress on the weak planes of joints and combining it with the Mohr–Coulomb strength theory. However, this criterion cannot describe the failure of intact rock matrix materials. To address this limitation, this paper normalizes the influence of joint orientation on strength and constructs a weight combination anisotropic multiaxial strength criterion considering the influence of joint direction. Then, taking the influence of joint direction as a weight parameter and multiplying it by the strength criterion of intact rock, the relationship between the failure strength of layered jointed rocks and joint direction is established. The model was verified by 507 sets of experimental data from nine types of rocks, confirming its good applicability and reliability in describing the influence of joint orientation on rock strength.</p></div>","PeriodicalId":49308,"journal":{"name":"Acta Geotechnica","volume":"20 4","pages":"1681 - 1701"},"PeriodicalIF":5.6,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Large strain consolidation model for very soft soils with prefabricated horizontal drains considering nonlinear compression and creep

IF 5.6 1区工程技术

Acta Geotechnica Pub Date : 2024-11-22 DOI: 10.1007/s11440-024-02452-3

Peng-Lin Li, Ding-Bao Song, Zhen-Yu Yin, Jian-Hua Yin

{"title":"Large strain consolidation model for very soft soils with prefabricated horizontal drains considering nonlinear compression and creep","authors":"Peng-Lin Li, Ding-Bao Song, Zhen-Yu Yin, Jian-Hua Yin","doi":"10.1007/s11440-024-02452-3","DOIUrl":"10.1007/s11440-024-02452-3","url":null,"abstract":"<div><p>The use of horizontal drains assisted by vacuum loading is an effective method for speeding up the consolidation of dredged soil slurry. However, few studies developed models for the large strain consolidation of clayey slurry with prefabricated horizontal drains (PHDs) under self-weight and vacuum loading considering the effects of nonlinear compression and creep. This study introduces a PHD-assisted finite strain consolidation model considering nonlinear compression and limited creep by incorporating an improved elasto-viscoplastic constitutive equation. Firstly, the governing equations for the consolidation of very soft soil with PHDs were derived and solved by the finite-difference method. Subsequently, the proposed consolidation model was verified by comparing the calculations with the finite element solutions, a laboratory model test, and a field trial performed in Hong Kong. Good agreement with the numerical solutions and measured results indicates that the proposed model can capture the consolidation features with PHD combining staged filling and time-dependent vacuum loading. Then, the proposed model was used to estimate a self-weight consolidation test and field test in Japan to show the performance of the proposed model. Finally, parametric studies were conducted to explore the influence of nonlinear compression and creep on the consolidation of soft soil with PHDs.</p></div>","PeriodicalId":49308,"journal":{"name":"Acta Geotechnica","volume":"20 3","pages":"1431 - 1453"},"PeriodicalIF":5.6,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11440-024-02452-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143570965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Investigation on the mechanism of size effect on suffusion via CFD-DEM simulations CFD-DEM模拟研究尺寸效应对渗流的影响机制

IF 5.6 1区工程技术

Acta Geotechnica Pub Date : 2024-11-21 DOI: 10.1007/s11440-024-02451-4

Yanzhen Zhu, Lingkai Hu, Shanlin Xu, Zheng Hu, Honglei Sun, Zhenqi Weng, Yongming Wang

{"title":"Investigation on the mechanism of size effect on suffusion via CFD-DEM simulations","authors":"Yanzhen Zhu, Lingkai Hu, Shanlin Xu, Zheng Hu, Honglei Sun, Zhenqi Weng, Yongming Wang","doi":"10.1007/s11440-024-02451-4","DOIUrl":"10.1007/s11440-024-02451-4","url":null,"abstract":"<div><p>Suffusion is a critical issue in geotechnical engineering. Despite extensive studies, the effect of soil specimen dimensions on suffusion remains unclear. In this paper, a coupled computational fluid dynamics and discrete element method (CFD-DEM) approach is employed to study the suffusion of gap-graded soils with varying aspect ratios, and the underlying physical mechanisms are discussed. The results indicate that as the aspect ratio increases, erosion degree, mechanical coordination numbers, and unevenness in the fines distribution decrease, while the likelihood of fine particles integrating into the soil skeleton rises. Before suffusion, specimens with lower aspect ratios show higher peak strengths. After suffusion, peak strength decreases with erosion degree. However, all specimens exhibit comparable residual strengths. The mechanism behind different suffusion behaviors in specimens with varying aspect ratios is primarily governed by their unique suffusion boundary conditions. Accounting for suffusion boundaries significantly modify erosion laws and eroded soil mechanics behaviors. A standardized specimen size is proposed to account for suffusion boundary effects, thereby minimizing errors attributed to variations in outlet sieve aperture sizes and inconsistencies in specimen dimensions. The results obtained highlight the influence of specimen size on suffusion, advancing our precise understanding of eroded soil behavior.</p></div>","PeriodicalId":49308,"journal":{"name":"Acta Geotechnica","volume":"20 1","pages":"347 - 364"},"PeriodicalIF":5.6,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142963114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Concept on plug development in jacked open-ended piles in clay considering total stresses

IF 5.6 1区工程技术

Acta Geotechnica Pub Date : 2024-11-21 DOI: 10.1007/s11440-024-02455-0

Philipp Wiesenthal, Sascha Henke

引用次数: 0

Micromechanics of fine-grain infiltration in coarse grain sands

IF 5.6 1区工程技术

Acta Geotechnica Pub Date : 2024-11-20 DOI: 10.1007/s11440-024-02464-z

Fan Chen, Antoine Wautier, Pierre Philippe, Nadia Benahmed, François Nicot

{"title":"Micromechanics of fine-grain infiltration in coarse grain sands","authors":"Fan Chen, Antoine Wautier, Pierre Philippe, Nadia Benahmed, François Nicot","doi":"10.1007/s11440-024-02464-z","DOIUrl":"10.1007/s11440-024-02464-z","url":null,"abstract":"<div><p>The loss of fine particles can induce mechanical instabilities in granular soils subjected to internal fluid flow. An appealing countermeasure consists of the re-injection of fine grains with the objective of achieving retention in the soil matrix. In this study, both gravity- and fluid-driven infiltration of fine particles into coarse-grain columns with different solid fraction <span>(phi)</span> and size ratios <i>R</i> have been studied using coupled pore-scale finite volume (PFV) and discrete element method (DEM) schemes. Three clogging regimes, surface clogging, deep infiltration, and percolation are detected, and the characteristic infiltration depths <span>(L_{0})</span> are found to grow exponentially with <i>R</i> under gravity- and fluid-driven cases. A probabilistic model derived from pore-constriction size statistics is then put forward, which could efficiently interpret the decaying distribution of fine retention for a given size ratio <i>R</i> and packing density. The mean transit velocity of fine grains follows an increasing trend with <i>R</i> under fixed <span>(phi)</span> and can be collapsed over an almost constant value with the appropriate scaling of <span>(phi /sqrt{R})</span>. Compared to gravitational percolation, more lateral dispersion is found in fluid-driven conditions, and an estimation of the related lateral dispersion coefficient <i>D</i> is provided based on <span>(phi)</span> and <i>R</i>.</p></div>","PeriodicalId":49308,"journal":{"name":"Acta Geotechnica","volume":"20 4","pages":"1533 - 1548"},"PeriodicalIF":5.6,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Inferred Winkler model for stiffness of suction caisson foundation under combined loading in non-homogeneous and layered soil

IF 5.6 1区工程技术

Acta Geotechnica Pub Date : 2024-11-20 DOI: 10.1007/s11440-024-02460-3

Zhenhao Shi, He Cui, Maosong Huang, Kanmin Shen, Bin Wang

{"title":"Inferred Winkler model for stiffness of suction caisson foundation under combined loading in non-homogeneous and layered soil","authors":"Zhenhao Shi, He Cui, Maosong Huang, Kanmin Shen, Bin Wang","doi":"10.1007/s11440-024-02460-3","DOIUrl":"10.1007/s11440-024-02460-3","url":null,"abstract":"<div><p>With the development of offshore wind turbines in deep water, suction caisson foundations jointly used with jackets have become a promising foundation type for those constructed in windfarms covered with soft soil. Reasonable prediction of the stiffness of suction caisson has a significant influence on analyzing both static and dynamic response of supported structures. Distributed spring-based Winkler models have been successfully constructed to evaluate the stiffness of pile and caisson foundations under vertical and lateral loading. However, the counterparts for suction caisson under general loading conditions (i.e., combined vertical, horizontal, and moment loading, V–H–M) are relatively under-developed, despite the latter representing one of the most fundamental working scenarios of the foundation. The goal of this work is to establish a simplified Winkler model capable of calculating stiffness of suction caisson foundation under combined loading (V–H–M) in non-homogeneous and layered soil. This purpose is achieved via the concept of “Inferred Winkler model.” In particular, we construct a special model structure that accounts for the distinct influences of foundation embedment and non-uniform distribution of soil reactions, while maintaining theoretical consistency with well-established Winkler models for pile and shallow foundations. Specific relationships and expressions in the above model are then inferred from finite element analysis (FEA). The performance of the proposed model is evaluated against FEA regarding both foundation response and soil reaction distributions under combined loadings in homogeneous, non-homogeneous and layered elastic soil. Reasonable agreement between the calculation results suggests that the proposed model is reliable for foundation stiffness assessments and has a much lower computational cost compared to FEA.</p></div>","PeriodicalId":49308,"journal":{"name":"Acta Geotechnica","volume":"20 3","pages":"1069 - 1087"},"PeriodicalIF":5.6,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143571141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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