Soils and Foundations最新文献

Study on drainage mechanism of complete path for vacuum preloading based on thermodynamics theory

IF 3.3 2区工程技术

Soils and Foundations Pub Date : 2024-12-01 DOI: 10.1016/j.sandf.2024.101542

Fu Chen , Aiping Tang

{"title":"Study on drainage mechanism of complete path for vacuum preloading based on thermodynamics theory","authors":"Fu Chen , Aiping Tang","doi":"10.1016/j.sandf.2024.101542","DOIUrl":"10.1016/j.sandf.2024.101542","url":null,"abstract":"<div><div>Vacuum preloading has been a widely used consolidation method for soft clay ground improvement since the 1980s. Consolidation theory only explains the radial drainage process from soil to prefabricated vertical drains (PVD); however, the complete drainage path mechanism by which water drains vertically through PVD to the upper horizontal sand drainage layer and eventually to vacuum pumps is still unclear, resulting in controversies about vacuum preloading. A large oedometer test was performed to study the complete drainage-path mechanism for vacuum preloading. During vacuum preloading, the soil’s average internal temperature decreased to 5 °C below initial temperature, with the lowest temperate occurring near the PVD, which was 2 °C lower than the outskirt. A complete drainage path mechanism is proposed based on the phenomenon of internal temperature decreases. Water evaporates only in the PVD, and the vertical movement of water in the PVD is caused by a density difference between the gas molecules that is independent of gravity. Finally, the proposed mechanism was used to explain the controversy about vacuum preloading. For example, vacuum should not decay along the PVD, vacuum acting elevation at the top or bottom of the PVD has no effect on the final vacuum preloading effectiveness, there is no unsaturated zone formed, and the groundwater level does not drop during vacuum preloading.</div></div>","PeriodicalId":21857,"journal":{"name":"Soils and Foundations","volume":"64 6","pages":"Article 101542"},"PeriodicalIF":3.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747452","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

Insights into the mechanics of uncemented and lightly cemented compacted iron ore tailings under high confining pressures

IF 3.3 2区工程技术

Soils and Foundations Pub Date : 2024-12-01 DOI: 10.1016/j.sandf.2024.101543

Nilo Cesar Consoli , Hugo Carlos Scheuermann Filho , Alexia Cindy Wagner , João Vítor de Azambuja Carvalho , João Pedro Camelo Guedes , Inácio Carvalho , Bruno Guimarães Delgado , João Paulo de Sousa Silva

{"title":"Insights into the mechanics of uncemented and lightly cemented compacted iron ore tailings under high confining pressures","authors":"Nilo Cesar Consoli , Hugo Carlos Scheuermann Filho , Alexia Cindy Wagner , João Vítor de Azambuja Carvalho , João Pedro Camelo Guedes , Inácio Carvalho , Bruno Guimarães Delgado , João Paulo de Sousa Silva","doi":"10.1016/j.sandf.2024.101543","DOIUrl":"10.1016/j.sandf.2024.101543","url":null,"abstract":"<div><div>Grading changes due to particle breakage are crucial in geotechnical engineering problems involving high pressures, such as elevated-height dry stacking facilities for compacted filtered iron ore tailings disposal. However, understanding the iron ore tailings response at high stress is still in its early stages in the Brazilian context. It is now marked by the increasing need for alternatives to tailings allocation rather than the traditional slurry disposal in impoundments. The present research, which examines the mechanical response of iron ore tailings and lightly cemented iron ore tailings over confining pressures ranging from 1.2 to 120 MPa for dry stacking purposes, provides significant insights into this area. The study relied on triaxial tests conducted on a high-pressure apparatus that employed specimens compacted at three different compaction degrees. The cement addition incurred slight differences in isotropic compression, enlarging the range of achievable states. Still, the shearing response of both uncemented and lightly cemented tailings was very similar, particularly at higher stress levels, resulting in an equivalent critical state locus. In the <em>v</em>- ln <em>p</em>́ plane, an S-shaped function described the critical state and delineated the regions where particle breakage becomes an important source of volumetric strain. In brief, this study provides novel insights into the behaviour of uncemented and lightly cemented iron ore tailings in the context of elevated-height dry stacking facilities.</div></div>","PeriodicalId":21857,"journal":{"name":"Soils and Foundations","volume":"64 6","pages":"Article 101543"},"PeriodicalIF":3.3,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747382","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

Wellbore stability research based on transversely isotropic strength criteria in shale formation 基于页岩层横向各向同性强度标准的井筒稳定性研究

IF 3.3 2区工程技术

Soils and Foundations Pub Date : 2024-11-21 DOI: 10.1016/j.sandf.2024.101541

Xiangsen Gao , Min Wang , Xian Shi , Peng Dai , Mingming Zhang

{"title":"Wellbore stability research based on transversely isotropic strength criteria in shale formation","authors":"Xiangsen Gao , Min Wang , Xian Shi , Peng Dai , Mingming Zhang","doi":"10.1016/j.sandf.2024.101541","DOIUrl":"10.1016/j.sandf.2024.101541","url":null,"abstract":"<div><div>Borehole instability is a significant concern when drilling inclined wells through bedding layers. Traditional drilling techniques have encountered various challenges due to shale’s tendency to shear and slide along faults, joints, and weak planes. This study explores the mechanisms behind borehole instability in layered shale formations by conducting triaxial compression experiments on shale samples with varying bedding angles. It examines the anisotropic nature of shale properties and how strength varies with bedding angle. By integrating anisotropic strength criteria and transversely isotropic stress models around wells, the study develops a predictive model for borehole instability in layered shale formations and assesses the impact of different anisotropic strength criteria on predicting collapse pressures. The results show that shale’s elastic modulus and Poisson’s ratio have an inverse relationship with the increasing bedding angle. Besides, the patchy plane of weakness model, characterized by the parameter η, accurately predicts strength during inherent shear failure, sliding along bedding planes, and mixed failure. In contrast, the single plane of weakness model yields the highest collapse pressure predictions, while the Mohr-Coulomb criterion provides the lowest. The patchy plane of weakness model offers intermediate and more realistic pressure predictions. Moreover, while the type of in-situ stress does not affect the magnitude of collapse pressure, it influences the distribution characteristics of the collapse pressure cloud map. These findings, which account for shale anisotropy in minimum mud pressure analysis, have the potential to enhance drilling efficiency in practical applications.</div></div>","PeriodicalId":21857,"journal":{"name":"Soils and Foundations","volume":"64 6","pages":"Article 101541"},"PeriodicalIF":3.3,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142701216","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

Efficient reliability analysis of unsaturated slope stability under rapid drawdown using XGBoost-based surrogate model 利用基于 XGBoost 的代用模型对快速缩减条件下的非饱和边坡稳定性进行高效可靠性分析

IF 3.3 2区工程技术

Soils and Foundations Pub Date : 2024-11-15 DOI: 10.1016/j.sandf.2024.101539

Wengang Zhang , Bo Ran , Xin Gu , Yanmei Zhang , Yulin Zou , Peiqing Wang

{"title":"Efficient reliability analysis of unsaturated slope stability under rapid drawdown using XGBoost-based surrogate model","authors":"Wengang Zhang , Bo Ran , Xin Gu , Yanmei Zhang , Yulin Zou , Peiqing Wang","doi":"10.1016/j.sandf.2024.101539","DOIUrl":"10.1016/j.sandf.2024.101539","url":null,"abstract":"<div><div>Reservoir slope stability during water level drawdown has drawn increasing concern in geotechnical engineering in recent years. In this study, an efficient reliability analysis framework based on the extreme gradient boosting (XGBoost) surrogate model is employed to evaluate the failure probability of unsaturated slopes subjected to the rapid drawdown considering the depth-dependent properties of spatially varying soils. A <em>c</em>-<em>φ</em> slope is selected as an illustrative example to investigate the coupled influence of the non-stationary characteristic of shear strength parameters and saturated hydraulic conductivity, as well as water level drawdown velocity, maximum drop height and scale of fluctuation on the slope failure probability. Results show that the adopted framework can estimate the low-level probability of slope failure with high accuracy and efficiency. It is found that the velocity and maximum height of water level drawdown have a significant effect on the unsaturated slope stability. Furthermore, it is recommended that the depth-dependent non-stationary soil properties be considered in most cases to ensure a more accurate result.</div></div>","PeriodicalId":21857,"journal":{"name":"Soils and Foundations","volume":"64 6","pages":"Article 101539"},"PeriodicalIF":3.3,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663552","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

Advancement ratio effect on screw pile performance in the bearing layer 推进比对承载层螺旋桩性能的影响

IF 3.3 2区工程技术

Soils and Foundations Pub Date : 2024-11-14 DOI: 10.1016/j.sandf.2024.101537

Adnan Anwar Malik , Shekh Istiaq Ahmed , Umair Ali , Syed Kamran Hussain Shah , Jiro Kuwano

{"title":"Advancement ratio effect on screw pile performance in the bearing layer","authors":"Adnan Anwar Malik , Shekh Istiaq Ahmed , Umair Ali , Syed Kamran Hussain Shah , Jiro Kuwano","doi":"10.1016/j.sandf.2024.101537","DOIUrl":"10.1016/j.sandf.2024.101537","url":null,"abstract":"<div><div>The advantages of using screw piles are quite evident nowadays, which enhances its importance in the field of deep foundations. Moreover, the current environmental challenges direct the construction industry towards sustainability, creating more opportunities for such type of piling techniques to be used in the future. Therefore, more investigation is required to optimise screw pile performance in terms of ultimate bearing capacity associated with installation efforts. To explore further, the current study focused on the effect of the advancement ratio on ultimate bearing capacity and work done due to installation load and torque. The model scale of testing is adopted, and two kinds of ground (using Toyoura sand), i.e., scenario I: loose sand over dense sand and scenario II: loose sand, are prepared to install the single helix screw pile. In the case of scenario I, the screw is installed up to 1 times the helix diameter into the dense bearing layer. Based on the experimental results, it was observed that as the advancement ratio (from 0.25 to 1.25) increased, the installation load also increased. On the other hand, the installation torque decreased with the increase in advancement ratio. This was due to the increase in the number of rotations per pitch penetration and the resultant movement of sand particles. The change in the state of the ground around the screw pile is strongly related to the advancement ratio and initial density. The ideal advancement ratio (1.0) is difficult to attain in the field due to high pressing load demand; empirical equations are developed, which can be used to estimate the increase/decrease of ultimate bearing capacity and associated installation requirements in terms of work done for the initial design stage.</div></div>","PeriodicalId":21857,"journal":{"name":"Soils and Foundations","volume":"64 6","pages":"Article 101537"},"PeriodicalIF":3.3,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663550","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

Spatial earth pressure analysis of clayey fill behind retaining wall in V-shaped gully terrain V 型沟谷地形中挡土墙后粘土填料的空间土压力分析

IF 3.3 2区工程技术

Soils and Foundations Pub Date : 2024-11-13 DOI: 10.1016/j.sandf.2024.101538

Yun Que , Jisong Zhang , Yu Tian , Xiaosong Li

{"title":"Spatial earth pressure analysis of clayey fill behind retaining wall in V-shaped gully terrain","authors":"Yun Que , Jisong Zhang , Yu Tian , Xiaosong Li","doi":"10.1016/j.sandf.2024.101538","DOIUrl":"10.1016/j.sandf.2024.101538","url":null,"abstract":"<div><div>Mountain road construction often involves crossing numerous ravine terrains. To ensure road safety, numerous shoulder retaining walls are built to stabilize the roadbed. However, the limitations imposed by gullies result in significant spatial effects on the soil pressure distribution behind the walls, rendering traditional two-dimensional soil pressure theories inadequate. To investigate the spatial distribution of active earth pressure on clayey fill behind the walls, this paper presents a three-dimensional theoretical solution for earth pressure on V-type retaining walls in gully terrains, using theoretical analysis and numerical simulation. The results indicate that the clayey fill causes a slip crack behind the wall, forming a tension crack region with zero earth pressure, the depth of which increases with the fill’s cohesive force. Additionally, the earth pressure distribution behind the V-type retaining wall exhibits a significant spatial effect, being “larger in the middle and smaller at the ends” along the wall’s width. Compared to traditional two-dimensional theories, the earth pressure predicted by this spatial theory is lower, and the resultant force location is higher, and the overturning resistance in region III is largest. Therefore, this part should be enhanced in construction design.</div></div>","PeriodicalId":21857,"journal":{"name":"Soils and Foundations","volume":"64 6","pages":"Article 101538"},"PeriodicalIF":3.3,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663551","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

Instability of sand under a lateral extrusion stress path with different drainage conditions 不同排水条件下横向挤压应力路径下沙子的不稳定性

IF 3.3 2区工程技术

Soils and Foundations Pub Date : 2024-11-12 DOI: 10.1016/j.sandf.2024.101529

Antonio Souza , Ana Claudia Telles , David Reid , Andy Fourie , Marcio Almeida

{"title":"Instability of sand under a lateral extrusion stress path with different drainage conditions","authors":"Antonio Souza , Ana Claudia Telles , David Reid , Andy Fourie , Marcio Almeida","doi":"10.1016/j.sandf.2024.101529","DOIUrl":"10.1016/j.sandf.2024.101529","url":null,"abstract":"<div><div>A series of lateral extrusion (LE) tests were carried out on silica fine sand using the triaxial device to study the initiation of instability under various drainage conditions on this stress path. All specimens were reconstituted using the moist tamping technique, having achieved state parameter (ψ<sub>0</sub>) values between −0.020 and +0.086 after anisotropic consolidation. The LE stress path consists in a decrease of mean effective stress and increase of the deviator stress at a constant rate, maintaining the vertical stress constant. The LE tests were performed either with the drainage valves open or with undrained increments followed by drainage. Different magnitudes of undrained increments were tested. For the same initial state parameter, the results indicated that the instability stress ratio (<span><math><mrow><mi>η</mi></mrow></math></span><em><sub>IL</sub></em>) decreases as drainage conditions changes from drained to undrained/drained increments. As the magnitude of the undrained increment increases, <span><math><mrow><mi>η</mi></mrow></math></span><em><sub>IL</sub></em> decreases. Further, consistent with previous studies, the test data shows that the static liquefaction can be triggered in tests where the drainage valves are open, generating high values of excess of pore pressure only after the onset of instability. The results were also compared to results from CSD and CAU tests.</div></div>","PeriodicalId":21857,"journal":{"name":"Soils and Foundations","volume":"64 6","pages":"Article 101529"},"PeriodicalIF":3.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663593","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

Inverse analysis for estimating geotechnical parameters using physics-informed neural networks 利用物理信息神经网络进行反分析以估算岩土工程参数

IF 3.3 2区工程技术

Soils and Foundations Pub Date : 2024-11-09 DOI: 10.1016/j.sandf.2024.101533

Shinichi Ito , Ryusei Fukunaga , Kazunari Sako

引用次数: 0

Electrodeposition-based self-healing technique for structures with loosely compacted sand 基于电沉积的松散压实砂结构自修复技术

IF 3.3 2区工程技术

Soils and Foundations Pub Date : 2024-11-09 DOI: 10.1016/j.sandf.2024.101535

Ibuki Nishimura, Hitoshi Matsubara

{"title":"Electrodeposition-based self-healing technique for structures with loosely compacted sand","authors":"Ibuki Nishimura, Hitoshi Matsubara","doi":"10.1016/j.sandf.2024.101535","DOIUrl":"10.1016/j.sandf.2024.101535","url":null,"abstract":"<div><div>The natural erosion of sand along coastlines and in landfills is a complex phenomenon influenced by interactions among currents, waves, tides, and wind. Countermeasures against internal erosion in landfills often involve installing geotextile sheets and/or filters between seawalls and landfills. However, the mere installation of such structures proves insufficient for comprehensively monitoring and mitigating soil erosion, and ensuring adequate ground stability and safety is challenging. This study focuses on the application of electrodeposition for mitigating soil erosion and potentially repairing these structures. By applying a weak electric current to severely deteriorated objects, carbonate minerals, called electrodeposits, are deposited on the cathode side and can repair vulnerable areas through self-organized solidification. Experiments were conducted using various silica sand specimens to assess the applicability of electrodeposition to discrete sand. The results revealed that, in specimens with relatively large sand particles, such as those in silica sand No. 3, the sand adhered to the cathode, forming a solidified area approximately 15–17 mm high. A microstructural analysis indicated the presence of crystallized minerals resembling calcium carbonate bonding within the interstitial spaces between the sand particles. These experimental findings suggest that electrodeposition can be applied to enhance the stability and safety of sandy soil-based structures.</div></div>","PeriodicalId":21857,"journal":{"name":"Soils and Foundations","volume":"64 6","pages":"Article 101535"},"PeriodicalIF":3.3,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663553","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

Modeling effect of rock shape characteristics on run-out distribution of rockfalls 模拟岩石形状特征对落石冲出分布的影响

IF 3.3 2区工程技术

Soils and Foundations Pub Date : 2024-11-08 DOI: 10.1016/j.sandf.2024.101531

T. Yoshida , R. Nomura , Y. Tuda , I. Yoshida , K. Terada , S. Moriguchi

引用次数: 0