Canadian Geotechnical Journal最新文献_第3页

An empirical equation predicting the saturated hydraulic conductivity of tailings 预测尾矿饱和导水性的经验公式

IF 3.6 3区工程技术

Canadian Geotechnical Journal Pub Date : 2023-12-05 DOI: 10.1139/cgj-2023-0339

Ji-ying Fan, R. K. Rowe

引用次数: 0

A two-dimensional effective stress framework for modelling whole-life soil strength changes due to pore pressure generation and dissipation, Part 2: Applications 二维有效应力框架，用于模拟孔隙压力产生和消散导致的土壤全寿命强度变化，第 2 部分：应用

IF 3.6 3区工程技术

Canadian Geotechnical Journal Pub Date : 2023-11-29 DOI: 10.1139/cgj-2022-0332

Yufei Wang, C. O’Loughlin, Zefeng Zhou, Christophe Gaudin

{"title":"A two-dimensional effective stress framework for modelling whole-life soil strength changes due to pore pressure generation and dissipation, Part 2: Applications","authors":"Yufei Wang, C. O’Loughlin, Zefeng Zhou, Christophe Gaudin","doi":"10.1139/cgj-2022-0332","DOIUrl":"https://doi.org/10.1139/cgj-2022-0332","url":null,"abstract":"Accurate quantification of the temporal changes in seabed strength allows for more reliable and less conservative geotechnical design. A recently developed effective stress framework, established within a one-dimensional computational domain to quantify changes in soil strength due to pore pressure generation and dissipation, has been extended to a two-dimensional (2D) computational domain to allow for consideration of boundary value problems that are too complex to be simplified to one-dimensional conditions. The work to implement the 2D framework is reported across two companion papers. The first of the two papers utilises large deformation finite element analyses to quantify the spatial distribution of accumulated plastic shear strain. These distributions are encapsulated within a strain influence function that is used within the new 2D framework in this paper to calculate the extent and magnitude of excess pore pressure, and in turn the mobilised soil strength for a number of boundary value problems that represent typical offshore geotechnical processes. The merit of the new 2D framework is explored via retrospective simulations of existing experimental and numerical data. The resulting comparisons demonstrate the potential of the new framework, which is in quantifying the reliability of a range of geotechnical structures under complex loading conditions.","PeriodicalId":9382,"journal":{"name":"Canadian Geotechnical Journal","volume":"24 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139214922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 two-dimensional effective stress framework for modelling whole-life soil strength changes due to pore pressure generation and dissipation, Part 1: Formulation 二维有效应力框架，用于模拟孔隙压力产生和消散导致的土壤全寿命强度变化，第 1 部分：公式化

IF 3.6 3区工程技术

Canadian Geotechnical Journal Pub Date : 2023-11-29 DOI: 10.1139/cgj-2022-0331

Yufei Wang, C. O’Loughlin, Zefeng Zhou, Christophe Gaudin

{"title":"A two-dimensional effective stress framework for modelling whole-life soil strength changes due to pore pressure generation and dissipation, Part 1: Formulation","authors":"Yufei Wang, C. O’Loughlin, Zefeng Zhou, Christophe Gaudin","doi":"10.1139/cgj-2022-0331","DOIUrl":"https://doi.org/10.1139/cgj-2022-0331","url":null,"abstract":"The undrained shear strength of fine-grained soils changes with time, reducing due to pore pressure generation, and increasing during consolidation. There is an increasing appetite to recognise these temporal soil strength changes in offshore geotechnical design, as it provides a basis for potentially less conservative designs. Contributions to this endeavour are reported across two companion papers. This first paper extends an existing effective stress framework that relates generation of pore pressure to accumulated plastic shear strain, allowing undrained shear strength to be calculated within the context of critical-state soil mechanics. The main development is the extension of the computational domain to two dimensions, allowing calculations to be made for boundary value problems that cannot be satisfactorily simplified to 1D conditions. The magnitude and distribution of accumulated shear strain surrounding objects buried in soil are quantified through a series of large deformation finite element analyses. These spatial distributions are described using a strain influence function in the new 2D framework to calculate the extent and magnitude of excess pore pressure, and in turn the mobilised soil strength around the buried object. The performance of the 2D framework is examined in the companion paper through retrospective simulations of experimental and numerical data.","PeriodicalId":9382,"journal":{"name":"Canadian Geotechnical Journal","volume":"19 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139212276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 Approach for Assessing Dissipated Excess Pore Pressure Induced Settlement 评估耗散超孔隙压力诱发沉降的实验方法

IF 3.6 3区工程技术

Canadian Geotechnical Journal Pub Date : 2023-11-29 DOI: 10.1139/cgj-2022-0063

A. Bayoumi, M. Chekired, M. Karray

{"title":"Experimental Approach for Assessing Dissipated Excess Pore Pressure Induced Settlement","authors":"A. Bayoumi, M. Chekired, M. Karray","doi":"10.1139/cgj-2022-0063","DOIUrl":"https://doi.org/10.1139/cgj-2022-0063","url":null,"abstract":"Upon dynamic loading, saturated soil loses its strength and behaves differently with respect to the excess pore pressure variation resulting in volumetric-induced settlements. Traditionally, these settlements have been evaluated using standard charts based on one soil type and its relative density (RD). To assess these settlements, this study established a unique experimental methodology based on two laboratory tests: triaxial simple shear and piezoelectric ring actuator technique. Fifty-seven tests were performed on Ottawa F65 sand under strain-controlled cyclic and post-cyclic conditions. A chart was generated, revealing a relationship between the dissipated energy from cyclic loading and volumetric strain (v), based on the shear wave velocity as a controlling factor. This study was compared with previous studies to verify the compatibility of the proposed approach. Another novelty was revealed by studying v variation with the dissipated pressure. This variation is presented in a post-seismic chart, in which deformations are tracked based on the initial soil state and maximum excess pore pressure generation ratio (Rumax). For each RD, the soil is divided between liquefied and non-liquefied states according to a specific Rumax (Rumax-trigger point). The calculation of the volume compressibility coefficient is proven to serve as a liquefaction-triggering criterion identifying the liquefied state.","PeriodicalId":9382,"journal":{"name":"Canadian Geotechnical Journal","volume":"5 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139212016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Internal Instability of Cohesionless Soils in Upward and Downward Flow: An Experimental Verification of Theory 无粘性土壤在向上和向下流动时的内部不稳定性：理论的实验验证

IF 3.6 3区工程技术

Canadian Geotechnical Journal Pub Date : 2023-11-29 DOI: 10.1139/cgj-2023-0011

Maoxin Li, R. Fannin, Mark Foster, Li Yan

引用次数: 0

Deformational response of a marine silty-clay with varying organic content in the triaxial compression space. 有机质含量不同的海洋淤泥质粘土在三轴压缩空间中的变形响应。

IF 3.6 3区工程技术

Canadian Geotechnical Journal Pub Date : 2023-11-29 DOI: 10.1139/cgj-2023-0058

Elisa Ponzoni, S. Muraro, A. Nocilla, C. Jommi

{"title":"Deformational response of a marine silty-clay with varying organic content in the triaxial compression space.","authors":"Elisa Ponzoni, S. Muraro, A. Nocilla, C. Jommi","doi":"10.1139/cgj-2023-0058","DOIUrl":"https://doi.org/10.1139/cgj-2023-0058","url":null,"abstract":"This study characterises the effects of naturally varying organic content on the compression and shear behaviour of a marine silty-clay from the Netherlands. Index properties and mechanical properties are determined through laboratory tests, including oedometer and multistage loading-unloading triaxial stress paths. The results indicate a significant impact of the organic content on the compression response, with both the loading and reloading indexes increasing as the loss on ignition increases from 3% to 7%. Additionally, the study suggests a directional response of the compression behaviour, with the loading index increasing with the stress ratio. The influence of the organic content on shear strength appears to be less significant. No brittle response is observed during shearing and a similar ultimate stress ratio is attained by all samples. However, a unique critical state line can only be identified for samples with similar organic content, as its intercept and slope are found to increase with increasing organic content. The experimental results from stress paths at constant stress ratio reveal an anisotropic pre-failure plastic deformation mode, which depends on the previous stress history and loading direction. This suggests that the stress-dilatancy relationship cannot be formulated as a unique function of the stress ratio. The high-quality experimental data presented in the paper enlarge the database on soft organic soils in view of the development of advanced constitutive models.","PeriodicalId":9382,"journal":{"name":"Canadian Geotechnical Journal","volume":"13 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139214962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Case study: 3D mobilized strength of compacted fill 案例研究：压实填料的三维移动强度

IF 3.6 3区工程技术

Canadian Geotechnical Journal Pub Date : 2023-11-20 DOI: 10.1139/cgj-2023-0187

Abedalqader Idries, Timothy D. Stark, Lucia Moya, Jiale Lin

引用次数: 0

In-situ Test and Calculation Method for Horizontal Deformation of Soil Induced by Multi-row Grouting 多行灌浆诱发土壤水平变形的原位测试和计算方法

IF 3.6 3区工程技术

Canadian Geotechnical Journal Pub Date : 2023-11-17 DOI: 10.1139/cgj-2023-0394

Xuesong Cheng, Linsong Zhao, Shengzhang Han, Yetao Ji, Zhaorong Xu, Lingbo Meng, Jun Pan, Gang Zheng, Ruikun Wang

{"title":"In-situ Test and Calculation Method for Horizontal Deformation of Soil Induced by Multi-row Grouting","authors":"Xuesong Cheng, Linsong Zhao, Shengzhang Han, Yetao Ji, Zhaorong Xu, Lingbo Meng, Jun Pan, Gang Zheng, Ruikun Wang","doi":"10.1139/cgj-2023-0394","DOIUrl":"https://doi.org/10.1139/cgj-2023-0394","url":null,"abstract":"Multi-row grouting can be used to repeatedly mitigate the deformation of critical structures like tunnels. Nevertheless, no comprehensive investigation into the development patterns of soil deformation and excess pore water pressure, induced by multi-row grouting in soft soil, has been conducted to date. To address this gap, this study carried out a field test of multi-row grouting, systematically exploring the evolution and accumulation of soil horizontal displacement (SHD) and excess pore water pressure (EPWP) resulting from multi-row grouting. The findings demonstrated that the grouting process during multi-row grouting respectively exerted reaction and shielding effects on the subsequent grouting for the behavior of soil surrounding the grouting area. The reaction and shielding effects increased proportionally with the number of grouted rows. To predict the SHD induced by multi-row grouting, considering the reaction and shielding effects, this study provided a theoretical calculation method based on cavity expansion theory and the concept of upper and lower bounds, and proposed an optimal grouting scheme.","PeriodicalId":9382,"journal":{"name":"Canadian Geotechnical Journal","volume":"49 5","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139263136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

An effective stress-based approach to modeling the chemo-mechanical behavior of saturated active clay 基于有效应力的饱和活性白土化学力学行为建模方法

IF 3.6 3区工程技术

Canadian Geotechnical Journal Pub Date : 2023-11-17 DOI: 10.1139/cgj-2022-0233

Zhaoyang Song, Tiantian Ma, Yan Liu, Guoqing Cai, Changfu Wei

{"title":"An effective stress-based approach to modeling the chemo-mechanical behavior of saturated active clay","authors":"Zhaoyang Song, Tiantian Ma, Yan Liu, Guoqing Cai, Changfu Wei","doi":"10.1139/cgj-2022-0233","DOIUrl":"https://doi.org/10.1139/cgj-2022-0233","url":null,"abstract":"Pore water chemistry can exert significant controls over the chemo-mechanical behavior of chemically-active soils, which has not been characterized by using the traditional Terzaghi’s effective stress to a satisfactory extent. In this paper, based on the concept of intergranular stress, the effective stress for saturated active soils is first reconceptualized and then incorporated into the framework of the modified Cam-Clay model to describe the mechanical response of soils upon complex chemical and mechanical loadings. The proposed model is capable of capturing very well the diverse features of the chemo-behavior of saturated active soils, while inheriting all the advantages of the MCC model, by introducing only one additional parameter. Within this context, a simple equation is derived to predict the development of swelling pressure with the variation of pore water chemistry. It is shown the proposed swelling-pressure equation predicts very well the development of swelling pressure for expansive soils with a dilute pore solution, though discrepancy appears at high concentration. Because the double layer of clay particles is severely suppressed at high salt concentration, the microfabric of soil can be significantly changed, pointing to the importance of taking into account the effect of soil fabric in the constitutive modeling of active soils with high pore water concentration.","PeriodicalId":9382,"journal":{"name":"Canadian Geotechnical Journal","volume":"45 11","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139264613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Impact of Roots on the Hydrogeological Properties of Silty Soil Covers 根系对淤泥覆盖层水文地质特性的影响

IF 3.6 3区工程技术

Canadian Geotechnical Journal Pub Date : 2023-11-15 DOI: 10.1139/cgj-2023-0016

Alex Proteau, M. Guittonny, Bruno Bussière

{"title":"Impact of Roots on the Hydrogeological Properties of Silty Soil Covers","authors":"Alex Proteau, M. Guittonny, Bruno Bussière","doi":"10.1139/cgj-2023-0016","DOIUrl":"https://doi.org/10.1139/cgj-2023-0016","url":null,"abstract":"Mine tailings storage poses significant environmental risks such as the formation of acid mine drainage (AMD). Engineered covers offer a solution by controlling water ingress. Their performance is based on specific soil hydrogeological properties (SHPs). They must support vegetation which can impact saturated hydraulic conductivity (ksat) and water retention curve (WRC). This study assesses the impact of four-year-old willow root colonization on silty soil covers using flexible wall permeameters and water retention tests. The obtained SHPs were compared with root traits. Results suggested that the hydrogeological properties of the studied in situ samples were not significantly affected by roots. The variation of measured and predicted ksat values spanned an order of magnitude, regardless of the root colonization intensity, up to a root length density (RLD) of 2.98 cm/cm3. RLD showed a significant and positive linear relationship with measured ksat values (R2 = 0.54). However, when root colonization was low (RLD < 1 cm/cm3), RLD was negatively correlated to the nvg (R2 = 0.44) parameter of the van Genuchten WRC model, while the opposite relationship was observed for samples with RLD > 1 cm/cm3 (R2 = 0.61). Additionally, RLD and the coarse root (diameter > 1 mm) volume to fine root volume (C/F ratio) influenced WRCs. Over time, coarser roots may have a more pronounced impact on SHPs; further research is needed","PeriodicalId":9382,"journal":{"name":"Canadian Geotechnical Journal","volume":"10 2","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139274598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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