Canadian Geotechnical Journal最新文献_第4页

Effects of extreme drought-rainfall on slope failure mechanisms: centrifuge modelling 极端干旱降雨对边坡破坏机制的影响:离心模拟

3区工程技术

Canadian Geotechnical Journal Pub Date : 2023-11-14 DOI: 10.1139/cgj-2023-0133

Haiyi Zhong, Yikai Wang, Shuai Zhang, Qi Zhang, C.W.W. Ng

引用次数: 0

Development and outcomes of a tailings slope stability comparative design exercise 尾矿边坡稳定性比较设计的发展与成果

3区工程技术

Canadian Geotechnical Journal Pub Date : 2023-11-10 DOI: 10.1139/cgj-2022-0065

David Reid, Andy Fourie

{"title":"Development and outcomes of a tailings slope stability comparative design exercise","authors":"David Reid, Andy Fourie","doi":"10.1139/cgj-2022-0065","DOIUrl":"https://doi.org/10.1139/cgj-2022-0065","url":null,"abstract":"Tailings storage facilities (TSFs) have undergone an unacceptably high failure rate for decades, leading to an increased focus on improving the safety of these structures. One aspect that has not received sufficient attention is examining how reliably and consistently engineers analyse the stability of TSFs. An understanding of the current state of practice is needed as there are a range of analytical methods available to engineers, while the high failure rate of these structures strongly points to some deficiencies in practice. To examine some of these issues, a tailings-focussed slope stability comparative design exercise was organised to compare the methods and results used by tailings engineers to analyse the same slope within which the phreatic surface was to rise under a specified pattern. Twenty-eight practitioners participated in the exercise to predict at what phreatic surface level the slope would fail. A wide range of predictions were made, ranging from assuming the slope would liquefy and fail instantly (i.e. before any rise in phreatic surface), to a range of techniques based on (i) yield strength ratios, (ii) stress path methods, and (iii) numerical analyses, each predicting various failure levels, and finally some predictors who applied drained strengths, resulting in predictions that the slope would not fail.","PeriodicalId":9382,"journal":{"name":"Canadian Geotechnical Journal","volume":"84 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135092262","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

Stability of sandy soils against internal erosion under cyclic loading and quantitatively examination of the composition and origin of eroded particles 循环荷载作用下砂质土抗内侵蚀的稳定性及侵蚀颗粒组成和来源的定量研究

3区工程技术

Canadian Geotechnical Journal Pub Date : 2023-11-09 DOI: 10.1139/cgj-2023-0325

Shaoheng Dai, Xuzhen He, Chenxi Tong, Feng Gao, Sheng Zhang, Daichao Sheng

{"title":"Stability of sandy soils against internal erosion under cyclic loading and quantitatively examination of the composition and origin of eroded particles","authors":"Shaoheng Dai, Xuzhen He, Chenxi Tong, Feng Gao, Sheng Zhang, Daichao Sheng","doi":"10.1139/cgj-2023-0325","DOIUrl":"https://doi.org/10.1139/cgj-2023-0325","url":null,"abstract":"Existing criteria for assessing internal erosion usually are based on static loading and the effect of cyclic load is not considered. Additionally, there are limited studies to examine the particle-size destitution and origin of eroded fine particles. This work presents an experimental investigation that examines the impact of cyclic loading on internal stability through a series of seepage tests. The composition and origin of lost particles are quantitatively studied using particle staining and image recognition techniques. After significant loss of particles, the specimens reach a state of transient equilibrium, resulting in a gradual slowdown of both particle loss rate and average flow velocity. The results indicate that cyclic loading promotes massive particle loss and causes erosion failure of specimens that are considered stable according to existing criteria. The reason is that under cyclic loading, local hydraulic gradients is oscillating, and a larger than average hydraulic gradient may occur, which is responsible for the internal instability. The analysis suggests that existing criteria can provide a reasonable assessment of the relative stabilities of specimens under static loads, but fail to capture the stabilities under cyclic loading conditions.","PeriodicalId":9382,"journal":{"name":"Canadian Geotechnical Journal","volume":" 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135192885","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

Correction Functions for Soil-Water Characteristics Curves Extending the Principles of Thermodynamics 土壤-水特征曲线的修正函数，扩展了热力学原理

3区工程技术

Canadian Geotechnical Journal Pub Date : 2023-11-08 DOI: 10.1139/cgj-2023-0266

Yao Li, Sai Vanapalli

{"title":"Correction Functions for Soil-Water Characteristics Curves Extending the Principles of Thermodynamics","authors":"Yao Li, Sai Vanapalli","doi":"10.1139/cgj-2023-0266","DOIUrl":"https://doi.org/10.1139/cgj-2023-0266","url":null,"abstract":"The soil-water characteristics curve (SWCC) that is typically measured from laboratory tests is fit using mathematical models that are based on capillary law and used along with the saturated soil properties for predicting the hydro-mechanical behavior of unsaturated soils. Such SWCC models are valid for coarse-grained soils. However, the same models are also extended for modeling the SWCC of fine-grained soils over suction range from 0 to 106 kPa with a correction function. Due to this reason, SWCC models with correction functions have limitations in rigorous analyses of complex thermo-hydro-mechanical-chemo (THMC) behaviors of unsaturated soils, especially in the high suction range. In the present study, correction function is proposed for modeling the SWCC behavior using two widely models based on a theoretical framework extending the principles of thermodynamics. The relationships between the traditional and the proposed correction functions are discussed. Finally, comparisons are provided between the proposed and the traditional correction functions on the SWCC behavior to highlight their differences. In addition, the effects of temperature and salinity on the SWCC with correction functions are also summarized. The proposed correction function is a valuable tool for rigorous analyses and reliable prediction of the complex THMC behaviors of unsaturated soils.","PeriodicalId":9382,"journal":{"name":"Canadian Geotechnical Journal","volume":" 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135340378","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

Performance of an Asymmetric Pit-in-Pit Excavation Supported by Diaphragm Wall and Multi Uplift Piles System in Coastal Areas 沿海地区连续墙-多抗拔桩体系非对称基坑支护性能分析

3区工程技术

Canadian Geotechnical Journal Pub Date : 2023-11-08 DOI: 10.1139/cgj-2023-0319

Ruisong Wang, Hongyuan Dong, Daoxu Shen, Jianfeng Li, Pengpeng Ni, Chenyang Zhao

{"title":"Performance of an Asymmetric Pit-in-Pit Excavation Supported by Diaphragm Wall and Multi Uplift Piles System in Coastal Areas","authors":"Ruisong Wang, Hongyuan Dong, Daoxu Shen, Jianfeng Li, Pengpeng Ni, Chenyang Zhao","doi":"10.1139/cgj-2023-0319","DOIUrl":"https://doi.org/10.1139/cgj-2023-0319","url":null,"abstract":"The performance of asymmetric pit-in-pit excavation supported by diaphragm wall and multi uplift piles in coastal areas has been rarely reported. In this work, case study is conducted to investigate the mechanical characteristics of such excavation. A numerical model is established using the ABAQUS finite element platform, and its effectiveness is evaluated by comparing with the field monitoring data. After evaluation, the effects of uplift piles on excavation-induced deformations are investigated. Results show that the maximum wall deflections (δhm) are 0.02%~0.22% of the excavation depth (He), with the ground surface settlements of less than 0.6%·He and the settlement influence zone extending beyond 4He. As the soil is excavated, the top wall shows outward deformations to the active zone, and the transverse support is under tension. The use of combined diaphragm wall and multi uplift piles reduces the embedment ratio of diaphragm wall to a minimum value of 0.14, and decreases the δhm and rebound of base soil (δvrm) by 42% and 63%, respectively. A design suggestion is proposed for pile diameter (D), pile length (L) and pile spacing (S) to fall within the range of 0.4~0.8 m, 10~20 m and 6D~8D, respectively.","PeriodicalId":9382,"journal":{"name":"Canadian Geotechnical Journal","volume":"14 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135341329","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

The influence of soil fabric on the monotonic and cyclic shear behaviour of consolidated and compacted specimens 土体结构对固结和压实试件单调和循环剪切特性的影响

3区工程技术

Canadian Geotechnical Journal Pub Date : 2023-11-03 DOI: 10.1139/cgj-2023-0141

Isabella Novais Silva, Buddhima Indraratna, Thanh Trung Nguyen, Cholachat Rujikiatkamjorn

{"title":"The influence of soil fabric on the monotonic and cyclic shear behaviour of consolidated and compacted specimens","authors":"Isabella Novais Silva, Buddhima Indraratna, Thanh Trung Nguyen, Cholachat Rujikiatkamjorn","doi":"10.1139/cgj-2023-0141","DOIUrl":"https://doi.org/10.1139/cgj-2023-0141","url":null,"abstract":"While the fabric of soil can significantly influence its behaviour, the effect of varying fabric parameters on the subgrade shear response is still not well understood. This study creates soil specimens with different fabrics which are then captured through X-ray microscopic-computed tomography scanning (micro-CT) and quantified by image processing techniques. A comprehensive laboratory investigation is conducted to understand how the soil fabric affects its monotonic and cyclic shear behaviour. The results indicate that the consolidation method creates a more homogeneous fabric with mainly small to medium interconnected pores, whereas the compaction technique creates significantly large and mostly inter-aggregate pores with lower connectivity. In this regard, the consolidated specimens exhibit an elastic-perfectly plastic behaviour, while the compacted specimens show strain-hardening transformation during isotropic monotonic shearing. Under anisotropic conditions, the compacted specimens exhibit a greater strain softening response and excess pore pressure than the consolidated specimens because they have a weaker fabric. Furthermore, the compacted specimens show a larger threshold strain at a smaller critical number of cycles due to the collapse of large pores. These current findings prove the decisive role that soil fabric plays in determining the shear response and failure of subgrade soils.","PeriodicalId":9382,"journal":{"name":"Canadian Geotechnical Journal","volume":"70 S29","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135819096","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

The role of physicochemical processes in ageing of shaft friction of driven steel piles in sand 物理化学过程在砂土中钢桩轴摩擦老化中的作用

3区工程技术

Canadian Geotechnical Journal Pub Date : 2023-10-30 DOI: 10.1139/cgj-2022-0639

Eduardo Bittar, B.M. Lehane, Hao Zheng

引用次数: 0

MSD applied to the construction of the British Library basement: a multi-stage excavation in London Clay MSD应用于大英图书馆地下室的建设:伦敦粘土的多阶段挖掘

3区工程技术

Canadian Geotechnical Journal Pub Date : 2023-10-30 DOI: 10.1139/cgj-2023-0238

Jamie J. Crispin, Abigail H. Bateman, Elia Voyagaki, Alexandra Campbell, George Mylonakis, Malcolm D. Bolton, Paul Joseph Vardanega

引用次数: 0

Generalized hydro-mechanically coupled hypoplastic constitutive model for unsaturated collapsible soils 非饱和湿陷性土广义水-力耦合欠塑性本构模型

3区工程技术

Canadian Geotechnical Journal Pub Date : 2023-10-27 DOI: 10.1139/cgj-2022-0633

Merita Tafili, Jan Machacek

引用次数: 0

Installation and capacity performance of multi-line dynamically installed anchors 多线动态安装锚杆的安装及承载力性能

3区工程技术

Canadian Geotechnical Journal Pub Date : 2023-10-27 DOI: 10.1139/cgj-2022-0623

Jun Liu, Yunfei Li, Xinshuai Guo, Congcong Han

引用次数: 0