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Hydraulic path dependence of shear strength for compacted loess

文献类型：期刊论文

作者Chen, Pan2,3; Jia, Shengao2; Wei, Xiaoqi4; Sun, Pingping1; Yi, Panpan2; Wei, Changfu2,3
刊名JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
出版日期2023-07-01
卷号15期号:7页码:1872-1882
关键词Shear strength Loess Hydraulic hysteresis Effective stress Nuclear magnetic resonance (NMR)
ISSN号1674-7755
DOI10.1016/j.jrmge.2022.12.006
英文摘要Shear strength is an essential geotechnical parameter for assessing the landslide potential of loess slopes under rainfall infiltration and farm irrigation conditions on the loess plateau. However, the hydraulic path dependence of shear strength for compacted loess under varying rainfall infiltration conditions has not been thoroughly investigated yet. To this end, a series of direct shear tests and nuclear magnetic resonance (NMR) measurements are carried out on compacted loess. The shear strength tests were continuously implemented on loess specimens under scanning wetting paths besides initial drying paths. The experimental data quantitatively verify the significant effect of hydraulic paths applied to specimens on shear strength of compacted loess. The unique failure envelope of shear strength of loess is identified under the effective stress framework based on intergranular stress, which verifies that the effective stress framework can consider the effect of hydraulic paths on shear strength. Based on the effective stress, a shear strength formula is proposed to characterize shear strengths under varying hydraulic paths, in which the parameters from the soil-water retention curve and shear strength at saturated state are simply required. The proposed shear strength formula can properly predict the measured shear strength data of compacted loess experiencing three hydraulic paths. Furthermore, the distribution curves of transverse relaxation time for pore water in soil under varying hydraulic paths are simultaneously measured using the NMR method. The physical mechanism for the difference in shear strength of loess subjected to different hydraulic paths can be uncovered based on soil-water evolutions in pores in microscale. (C) 2023 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
资助项目National Natural Science Foundation of China[41877269] ; National Natural Science Foundation of China[12002243] ; National Natural Science Foundation of China[41907046]
WOS研究方向Engineering
语种英语
WOS记录号WOS:001070902700018
出版者SCIENCE PRESS
源URL[http://119.78.100.198/handle/2S6PX9GI/39501]  
专题中科院武汉岩土力学所
通讯作者Chen, Pan; Wei, Changfu
作者单位1.Xi An Jiao Tong Univ, Sch Human Settlements & Civil Engn, Xian 710061, Peoples R China
2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Xuzhou Highway Engn Corp, Xuzhou 221000, Jiangsu, Peoples R China
推荐引用方式
GB/T 7714		 Chen, Pan,Jia, Shengao,Wei, Xiaoqi,et al. Hydraulic path dependence of shear strength for compacted loess[J]. JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,2023,15(7):1872-1882.
APA Chen, Pan,Jia, Shengao,Wei, Xiaoqi,Sun, Pingping,Yi, Panpan,&Wei, Changfu.(2023).Hydraulic path dependence of shear strength for compacted loess.JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,15(7),1872-1882.
MLA Chen, Pan,et al."Hydraulic path dependence of shear strength for compacted loess".JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 15.7(2023):1872-1882.

入库方式： OAI收割

来源：武汉岩土力学研究所

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