Acta Geotechnica最新文献_第3页

Uncertainty quantification in data-driven modelling with application to soil properties prediction 数据驱动建模中的不确定性量化，应用于土壤特性预测

IF 5.6 1区工程技术

Acta Geotechnica Pub Date : 2025-01-03 DOI: 10.1007/s11440-024-02484-9

Geng-Fu He, Zhen-Yu Yin, Pin Zhang

{"title":"Uncertainty quantification in data-driven modelling with application to soil properties prediction","authors":"Geng-Fu He, Zhen-Yu Yin, Pin Zhang","doi":"10.1007/s11440-024-02484-9","DOIUrl":"10.1007/s11440-024-02484-9","url":null,"abstract":"<div><p>Accurate estimation of soil properties is crucial for reliability-based design in engineering practices. Conventional empirical equations and prevalent data-driven models rarely consider uncertainty quantification in both measurement and modelling processes. This study tailors three uncertainty quantification methods including Bayesian learning, Markov chain Monte Carlo and ensemble learning into data-driven modelling, in which support vector regression is selected as the baseline algorithm. The compression index of clay is adopted as an example for model training and testing. In this context, Bayesian learning and Markov chain quantify uncertainty by considering the distribution of function and hyper-parameters, respectively, while different sampled data are employed to explore model uncertainty. These models are evaluated in terms of accuracy, reliability and cost-effectiveness and also compared with Gaussian process regression, etc. The results reveal that based on built-in structural risk minimization, sparse solution and uncertainty quantification, developed models can capture more accurate and reliable correlations from actual measured data over other methods. Their practicability and generalization ability are also verified on a new creep index database. The proposed probabilistic methods are also compiled into a user-friendly platform, showing a significant potential to enrich the data-driven modelling framework and be applied in other geotechnical properties.</p></div>","PeriodicalId":49308,"journal":{"name":"Acta Geotechnica","volume":"20 2","pages":"843 - 859"},"PeriodicalIF":5.6,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143361751","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

Forward and inverse models of magnetically-susceptible grout in rock fracture grouting

IF 5.6 1区工程技术

Acta Geotechnica Pub Date : 2025-01-02 DOI: 10.1007/s11440-024-02491-w

Haizhi Zang, Shanyong Wang, John P. Carter

{"title":"Forward and inverse models of magnetically-susceptible grout in rock fracture grouting","authors":"Haizhi Zang, Shanyong Wang, John P. Carter","doi":"10.1007/s11440-024-02491-w","DOIUrl":"10.1007/s11440-024-02491-w","url":null,"abstract":"<div><p>Rock grouting is an important technique for sealing rock fractures, but it has long been plagued by the lack of a practical approach to delineate the extent of grout propagation inside the facture flow channels. Despite previous attempts to evaluate grout performance, barely any non-intrusive way can directly and accurately reveal the grout penetration region. In this study, a new inversion method is suggested, based on a magnetic forward model, to predict the burial depth, dip angle and lateral (horizontal) projection span of a grouted area in a single rock fracture. It is assumed that the grout flow route inside a rock mass can be magnetically observable when ferromagnetic materials are added to the grout. The method commences by forward modelling the magnetic field caused by an inclined sheet of magnetic material. Based on the analytical solutions for calculating the magnetic field in the presence of the sheet, a relationship between the magnetic anomalies and the geometric parameters of the sheet is established. Following the feasibility study of the forward model, an inversion procedure is proposed to determine the geometric information of the sheet using multiple observations of magnetic data obtained at various levels above the sheet. The results show the applicability of the inverse method for estimating the burial depth at observation distances up to five times the length down dip of the sheet. Moreover, a correction nomogram is proposed to address the sources of error with known approximate parameters, and this greatly improves the model’s performance. Finally, some insights into the application of the inversion process in a three-dimensional magnetic field are presented. The current solutions for predicting the geometry of grout intrusion in a rock fracture system are shown to be efficient. Both the forward and inverse models proposed should provide valuable contributions to the problem of addressing the error involved in non-destructive, remote detection of a grout region in a fractured rock mass.</p></div>","PeriodicalId":49308,"journal":{"name":"Acta Geotechnica","volume":"20 4","pages":"1503 - 1531"},"PeriodicalIF":5.6,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716683","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

Time- and concentration-dependent shear strength evolvement of compacted GMZ bentonite in alkaline conditions

IF 5.6 1区工程技术

Acta Geotechnica Pub Date : 2024-12-28 DOI: 10.1007/s11440-024-02512-8

Yong-gui Chen, Yu-cheng Li, Chang-jie Li, Wei-min Ye, Qiong Wang

{"title":"Time- and concentration-dependent shear strength evolvement of compacted GMZ bentonite in alkaline conditions","authors":"Yong-gui Chen, Yu-cheng Li, Chang-jie Li, Wei-min Ye, Qiong Wang","doi":"10.1007/s11440-024-02512-8","DOIUrl":"10.1007/s11440-024-02512-8","url":null,"abstract":"<div><p>Understanding the shear behaviors of compacted bentonite has been imperative to evaluate the mechanical stability of the buffer/backfill materials, especially under the influence of the alkaline solutions generated by the degradation of cementitious materials. By soaking the compacted bentonite in the alkaline solutions for different periods (e.g., 60, 90, and 120 days) at constant volume condition, this study investigates the impact of different concentrations of NaOH solutions (e.g., 0 M, 0.1 M, 0.5 M, and 1.0 M) on the shear strength of compacted Gaomiaozi (GMZ) bentonite via direct shear tests. The microstructure and the mineralogical evolvement of the compacted bentonite were investigated through scanning electron microscope (SEM) and X-ray diffraction (XRD) tests, respectively. Results demonstrated that the peak shear strength of compacted bentonite generally increased with the concentrations of NaOH for a short soaking period (e.g., 60 days) with the friction angle increased from 3.66° to 12.24°. However, this trend became less pronounced over longer periods (e.g., 90 and 120 days), with the peak shear strength initially increasing and then decreasing after reaching a critical NaOH concentration (i.e., 0.5 M), which suggests the impact of alkaline solution on the shear strength of compacted bentonite is both time- and concentration-dependent. Analyses from SEM and XRD tests indicated that the microstructure degradation and mineral dissolution were induced by the alkaline solutions.The mechanical behaviors of compacted bentonite suggest the complex interplay between osmotic suction and mineral dissolution influencing the shear strength of compacted bentonite. Based on the fractal dimensions of the compacted bentonite, a modified model is proposed to account for both the osmotic and dissolution effects of the alkaline solutions on the compacted bentonite.</p></div>","PeriodicalId":49308,"journal":{"name":"Acta Geotechnica","volume":"20 4","pages":"1743 - 1757"},"PeriodicalIF":5.6,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716719","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

Interfacial mechanical behavior of epoxy-quartz: MD nanoindentation and nanoscratching study

IF 5.6 1区工程技术

Acta Geotechnica Pub Date : 2024-12-27 DOI: 10.1007/s11440-024-02503-9

Pengchang Wei, Zhen-Yu Yin, Pierre-Yves Hicher, Wangqi Xu

{"title":"Interfacial mechanical behavior of epoxy-quartz: MD nanoindentation and nanoscratching study","authors":"Pengchang Wei, Zhen-Yu Yin, Pierre-Yves Hicher, Wangqi Xu","doi":"10.1007/s11440-024-02503-9","DOIUrl":"10.1007/s11440-024-02503-9","url":null,"abstract":"<div><p>Fiber-reinforced polymer (FRP) is widely used in various engineering fields due to its several outstanding properties. In geotechnical engineering, the interactions between FRP and soil play an essential role. In this paper, molecular dynamics (MD) simulation method has been performed to study the interfacial mechanical behavior of epoxy-quartz interface as a subsystem of FRP-soil structure. Uniaxial traction on bulk epoxy was conducted to verify the accuracy of the model. The nanoindentation and nanoscratching mechanisms of epoxy-quartz interface were analyzed, considering the effect of loading rate, sliding velocity, and indentation depth. Abrasion models have been proposed based on the relationship between forces and displacements. Simulation results indicated that the indenter force and the indentation hardness of epoxy substrate increased with the loading rate during nanoindentation, and the relationship between indenter force and indentation depths could be expressed by a power law. The forces along three directions increased with the sliding velocity or indentation depths during nanoscratching, the sliding force and the sliding distance following an exponential function. The numerical simulations demonstrated that the surface wear of the epoxy substrate had the shape of a groove in nanoindentation and a fan-shaped distribution during the nanoscratching process.</p></div>","PeriodicalId":49308,"journal":{"name":"Acta Geotechnica","volume":"20 4","pages":"1599 - 1620"},"PeriodicalIF":5.6,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11440-024-02503-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716651","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

Sensitivity analysis on critical combinations of input parameters in DEM granular flow analysis DEM颗粒流分析中输入参数关键组合的敏感性分析

IF 5.6 1区工程技术

Acta Geotechnica Pub Date : 2024-12-20 DOI: 10.1007/s11440-024-02499-2

Junsen Xiao, Kenta Tozato, Reika Nomura, Yu Otake, Kenjiro Terada, Shuji Moriguchi

{"title":"Sensitivity analysis on critical combinations of input parameters in DEM granular flow analysis","authors":"Junsen Xiao, Kenta Tozato, Reika Nomura, Yu Otake, Kenjiro Terada, Shuji Moriguchi","doi":"10.1007/s11440-024-02499-2","DOIUrl":"10.1007/s11440-024-02499-2","url":null,"abstract":"<div><p>Granular flow is a typical process that occurs in sediment disasters, including rockfalls, avalanches and landslides, etc. The runout distance in granular flow is closely associated with the ultimate impact range of these sediment disasters. However, this factor is often highly sensitive to various physical parameters and exhibits significant randomness. Hence the study of granular flow is crucial to elucidating the mechanism of such disasters and even to disaster prevention and mitigation. In recent years, a numerical simulation called discrete element method (DEM) that simulates at the particle level has been widely used in this field. Based on the above situation, this study aimed to capture the critical DEM input parameter combinations for risk assessment in a four-dimensional parameter space considering the particle size distribution. XGBoost feature importance is employed to decide the search priority, and its results indicate that the friction angle with bottom surface (FABS) and coefficient of restitution (COR) are the key parameters. The two key parameter spaces were then comprehensively explored using Gaussian process regression response surfaces. The correlation between the FABS and runout distance appeared as a convex function. The COR exhibited diverse degrees of approximately linear correlation with the runout distance throughout the granular flow. The particle size distribution indirectly led to inconsistencies between the bidisperse flow and other granular flows in the influence mechanisms of the key parameters. By clarifying this effect, we efficiently identified two critical parameter combinations for granular flow DEM simulation.</p></div>","PeriodicalId":49308,"journal":{"name":"Acta Geotechnica","volume":"20 1","pages":"387 - 412"},"PeriodicalIF":5.6,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11440-024-02499-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142963145","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

Novel insights into the dilatancy and non-coaxiality of sand under generalised constant-η loading

IF 5.6 1区工程技术

Acta Geotechnica Pub Date : 2024-12-18 DOI: 10.1007/s11440-024-02465-y

P. K. Triantafyllos, V. N. Georgiannou, I.-O. Georgopoulos

{"title":"Novel insights into the dilatancy and non-coaxiality of sand under generalised constant-η loading","authors":"P. K. Triantafyllos, V. N. Georgiannou, I.-O. Georgopoulos","doi":"10.1007/s11440-024-02465-y","DOIUrl":"10.1007/s11440-024-02465-y","url":null,"abstract":"<div><p>The present study investigates the behaviour of sand under generalised compression loading. A stress path architecture is devised featuring the repetition of loading and unloading at constant η = q/p′ for a sequence of increasing α<sub>σ′1</sub> and <i>b</i> = sin<sup>2</sup>α<sub>σ′1</sub>; where α<sub>σ′1</sub> is the principal direction of stress, and <i>b</i> = <span>(frac{{left( {sigma{prime} 2 - sigma{prime} 3} right)}}{{left( {sigma{prime} 1 - sigma{prime} 3} right)}})</span> is the intermediate principal stress ratio. Irrecoverable volumetric and shear strains develop under compression with the former being considerably lower than the latter, exhibiting weaker variations with η and α<sub>σ′1</sub>. It is shown that the compression of pre-loaded sand at the same η but different α<sub>σ′1</sub> induces non-coaxiality uncorrelated to excessive plastic contraction. The volumetric and shear strains increase when one of the planes of maximum stress obliquity aligns with the horizontal bedding plane. Furthermore, the compressibility, dε<sub>vol</sub>/dp′, oscillates with the increase in α<sub>σ′1</sub> at constant η. The dilatancy, D = dε<sub>vol</sub>/dε<sub>q</sub>, varies from very large values to zero depending on the stress path and stress history. It is also shown that the variable dε<sub>q</sub>/dp′ normalises effectively both the non-coaxiality angle, ξ = α<sub>dε1</sub>-α<sub>σ′1</sub>, and the dilatancy, D. Specifically, a unique curve describes the relationship between ξ and dε<sub>q</sub>/dp′ for a given α<sub>σ′1</sub> irrespective of η, p′, and ψ (state parameter). On the other hand, a unique curve describes the relationship between D and dε<sub>q</sub>/dp′ irrespective of the value of the variables η, α<sub>σ′1</sub>, b, p′, and ψ, and of the pre-shearing and pre-loading. This inverse proportion relationship indicates the decoupling of the incremental volumetric strains from the incremental shear strains in the compression mode.</p></div>","PeriodicalId":49308,"journal":{"name":"Acta Geotechnica","volume":"20 3","pages":"1103 - 1139"},"PeriodicalIF":5.6,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143571117","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

Investigations on mechanical responses of frozen soil–rock mixture under cyclic loading: experiments and binary-medium-based multiscale constitutive model 循环荷载作用下冻土-岩石混合体力学响应研究：试验与二元介质多尺度本构模型

IF 5.6 1区工程技术

Acta Geotechnica Pub Date : 2024-12-18 DOI: 10.1007/s11440-024-02480-z

Dan Wang, Enlong Liu, Qihao Yu, Chengsong Yang, Yunming Yang, Bingtang Song, Jian Kang, Ling Chen, Haotian Wei, Qiong Li

{"title":"Investigations on mechanical responses of frozen soil–rock mixture under cyclic loading: experiments and binary-medium-based multiscale constitutive model","authors":"Dan Wang, Enlong Liu, Qihao Yu, Chengsong Yang, Yunming Yang, Bingtang Song, Jian Kang, Ling Chen, Haotian Wei, Qiong Li","doi":"10.1007/s11440-024-02480-z","DOIUrl":"10.1007/s11440-024-02480-z","url":null,"abstract":"<div><p>In cold regions, the frozen soil–rock mixture (FSRM) is subjected to cyclic loading coupled with freeze–thaw cycles due to seismic loading and ambient temperature changes. In this study, in order to investigate the dynamic mechanical response of FSRM, a series of cyclic cryo-triaxial tests were performed at a temperature of −10 °C on FRSM with different coarse-grained contents under different loading conditions after freeze–thaw cycles. The experimental results show that the coarse-grained contents and freeze–thaw cycles have a significant influence on the deformation properties of FSRM under cyclic loading. Correspondingly, a novel binary-medium-based multiscale constitutive model is firstly proposed to describe the dynamic elastoplastic deformation of FSRM based on the coupling theoretical framework of breakage mechanics for geomaterials and homogenization theory. Considering the multiscale heterogeneities, ice-cementation differences, and the breakage process of FSRM under external loading, the relationship between the microscale compositions, the mesoscale deformation mechanism (including cementation breakage and frictional sliding), and the macroscopic mechanical response of the frozen soil is first established by two steps of homogenization on the proposed model. Meanwhile, a mixed hardening rule that combines the isotropic hardening rule and kinematic hardening is employed to properly evaluate the cyclic plastic behavior of FSRM. Finally, comparisons between the predicted results and experimental results show that the proposed multiscale model can simultaneously capture the main feature of stress–strain (nonlinearity, hysteresis, and plastic strain accumulation) and volumetric strain (contraction and dilatancy) of the studied material under cyclic loading.</p></div>","PeriodicalId":49308,"journal":{"name":"Acta Geotechnica","volume":"20 1","pages":"231 - 263"},"PeriodicalIF":5.6,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142963107","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

Cosserat model incorporating anisotropy evolution and its application in numerical analysis of strain localization in clay 考虑各向异性演化的Cosserat模型及其在粘土应变局部化数值分析中的应用

IF 5.6 1区工程技术

Acta Geotechnica Pub Date : 2024-12-16 DOI: 10.1007/s11440-024-02483-w

Wencheng Wei, Hongxiang Tang, Yang Liu, Haolong Chen

{"title":"Cosserat model incorporating anisotropy evolution and its application in numerical analysis of strain localization in clay","authors":"Wencheng Wei, Hongxiang Tang, Yang Liu, Haolong Chen","doi":"10.1007/s11440-024-02483-w","DOIUrl":"10.1007/s11440-024-02483-w","url":null,"abstract":"<div><p>This paper deeply couples the exponential-type nonlinear strain softening with the anisotropic method of microstructure tensor combined stress invariants, proposing an effective strength formula that reflects the anisotropy evolution of soil. Furthermore, an expression for the anisotropy ratio <i>k</i> of strength as an equivalent plastic strain-related variable is derived. For natural clay, this evolution of strength anisotropy is incorporated into the Mohr–Coulomb-matched Drucker–Prager (MC-matched DP) yield criterion within the Cosserat continuum framework, resulting in a more refined soil constitutive model. The main strength parameters required for this model can be conveniently obtained based on conventional soil tests, and the model functionality can be degraded through parameter adjustments. The detailed procedure of stress updating algorithm and the elastoplastic tangent modulus matrix are provided for the constitutive integration. Through the finite element implementation, the superiority of the model is demonstrated compared with existing literature. Also, a biaxial compression example is systematically analyzed to prove that the model can effectively reflect the sensitivity of soil to loading direction. Moreover, the evolution of the shear band morphology, particle rotation in the shear band, and the anisotropy degree presented by the model are consistent with previous experimental studies and discrete element method (DEM)-related literature results. Furthermore, the proposed model effectively addresses numerical convergence issues and mesh size dependence usually encountered in classical models during the simulation of strain localization occurred in the soil.</p></div>","PeriodicalId":49308,"journal":{"name":"Acta Geotechnica","volume":"20 1","pages":"365 - 385"},"PeriodicalIF":5.6,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142963102","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

Final steady state of sloping capillary barriers under constant intensity rain: development and numerical validation of a simplified method of analysis 恒强雨作用下倾斜毛细屏障的最终稳态：一种简化分析方法的发展与数值验证

IF 5.6 1区工程技术

Acta Geotechnica Pub Date : 2024-12-16 DOI: 10.1007/s11440-024-02492-9

Simon J. Wheeler, Paverean Mudcharoen, Riccardo Scarfone

{"title":"Final steady state of sloping capillary barriers under constant intensity rain: development and numerical validation of a simplified method of analysis","authors":"Simon J. Wheeler, Paverean Mudcharoen, Riccardo Scarfone","doi":"10.1007/s11440-024-02492-9","DOIUrl":"10.1007/s11440-024-02492-9","url":null,"abstract":"<div><p>A new simplified method of analysis is proposed for predicting the final steady state behaviour of sloping capillary barriers subjected to continuous rain of constant intensity. In contrast to an existing simplified method, the proposed new method assumes approximate final steady state suction profiles on vertical cross-sections of the finer layer that are appropriate for sloping capillary barriers, with flow parallel to the slope in the lower part of the finer layer. Numerical validation, performed by hydraulic FE modelling, shows that, in all cases studied, the final steady state profiles of suction, degree of saturation and horizontal seepage velocity predicted by the new simplified method are excellent matches to the corresponding results from FE simulations. As a consequence, values of water storage capacity and water transfer capacity are accurately predicted in all cases, together with the final steady state variation of water stored with horizontal coordinate. A parametric study shows the influence of key variables (slope angle, material of finer layer, thickness of finer layer and rainfall intensity) on water storage capacity and water transfer capacity of sloping capillary barriers.</p></div>","PeriodicalId":49308,"journal":{"name":"Acta Geotechnica","volume":"20 1","pages":"1 - 21"},"PeriodicalIF":5.6,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142963103","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

Mechanical and deformation behavior of layered hydrate-bearing clayey-silty sediments: different effective confining pressures and clay content analyses

IF 5.6 1区工程技术

Acta Geotechnica Pub Date : 2024-12-14 DOI: 10.1007/s11440-024-02496-5

Songkui Sang, Liang Kong, Zhaoyuan Zeng, Yapeng Zhao, Jiaqi Liu, Shijun Zhao

{"title":"Mechanical and deformation behavior of layered hydrate-bearing clayey-silty sediments: different effective confining pressures and clay content analyses","authors":"Songkui Sang, Liang Kong, Zhaoyuan Zeng, Yapeng Zhao, Jiaqi Liu, Shijun Zhao","doi":"10.1007/s11440-024-02496-5","DOIUrl":"10.1007/s11440-024-02496-5","url":null,"abstract":"<div><p>The layered distribution of hydrates significantly influences the mechanical properties of hydrate-bearing sediments (HBS). A comprehensive understanding of the mechanical and deformation behaviors of layered HBS is essential for the safe and effective exploitation of hydrates. In this study, marine clay from the South China Sea and quartz sand were used to simulate hydrate-bearing clayey-silty sediments, and layered hydrate-bearing clayey-silty sediments (LHBCSS) were prepared. A series of consolidated-drained triaxial tests were conducted, and the results were compared with those from homogeneous hydrate-bearing clayey-silty sediments (HHBCSS) to analyze the differences in mechanical properties and deformation characteristics. The shear strength and deformation behavior of LHBCSS were further investigated. The results show that the layered distribution of hydrates reduces the initial stiffness and strength of HBS, while promoting strain hardening in the specimens. The failure strength of LHBCSS is significantly influenced by the effective confining pressure, with the clay content having no obvious effect. However, the clay content is negatively correlated with the secant modulus (<i>E</i><sub>50</sub>). The internal friction angle of the LHBCSS is higher than that of the HHBCSS, and the cohesion of the LHBCSS gradually increases with the clay content. The layered hydrate distribution causes the volumetric strain of HBS to favor shear contraction. The maximum shear dilatation rate of LHBCSS is notably lower than that of HHBCSS, and the clay content has a minimal effect on the critical stress ratio of LHBCSS. The layered distribution of hydrates alters the stress behavior between the upper and lower layers of the specimen, with the low hydrate saturation layer having a greater influence on the overall strength and deformation characteristics of the HBS.</p></div>","PeriodicalId":49308,"journal":{"name":"Acta Geotechnica","volume":"20 2","pages":"861 - 890"},"PeriodicalIF":5.6,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143362008","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