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Influences of strain rate on mechanical behaviors of unsaturated and quasi-saturated loess under varying drainage conditions

文献类型：期刊论文

作者Zhang, Tongwei3; Li, Sheng3; Lan, Hengxing1,2; Zhang, Huyuan3; Zhang, Fanyu3
刊名JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
出版日期2025-02-01
卷号17期号:2页码:1163-1181
关键词Unsaturated loess Strain rate Shearing strength Deformation modulus Drainage conditions
ISSN号1674-7755
DOI10.1016/j.jrmge.2024.03.014
产权排序2
文献子类Article
英文摘要Although time-dependent deformation of geomaterials underpins slope-failure prediction models, the influence of strain rate on shearing strength and deformation behavior of loess remains unclear. The consolidated undrained (CU) and drained (CD) triaxial testing elucidated the impact of strain rate (0.005-0.3 mm/min) on strength envelopes, deformation moduli, pore pressures, and dilatancy characteristics of unsaturated and quasi-saturated loess. Under drained conditions with a controlled matric suction of 50 kPa, increasing strain rates from 0.005 mm/min to 0.011 mm/min induced decreases in failure deviatoric stress (qf), initial deformation modulus (Ei), and cohesion (c), while friction angles remained unaffected. Specimens displayed initial contractive volumetric strains transitioning to dilation across varying confining pressures. Higher rates diminished contractive volumetric strains and drainage volumes, indicating reduced densification and strength in the shear zone. Under undrained conditions, both unsaturated and quasi-saturated (pore pressure coefficient B = 0.75) loess exhibited deteriorating mechanical properties with increasing rates from 0.03 mm/min to 0.3 mm/min. For unsaturated loess, reduced contractive volumetric strains at higher rates manifested relatively looser structures in the pre- peak stress phase. The strength decrement in quasi-saturated loess arose from elevated excess porewater pressures diminishing effective stresses. Negative porewater pressures emerged in quasi-saturated loess at lower confining pressures and strain rates. Compared to previous studies, the qf and Ei exhibited rate sensitivity below threshold values before attaining minima with marginal subsequent influence. The underlying mechanism mirrors the transition from creep to accelerated deformation phase of landslides. (c) 2025 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Published 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/).
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WOS关键词SHEAR-STRENGTH ; PARAMETERS ; FAILURE ; CREEP ; SOILS
WOS研究方向Engineering
语种英语
WOS记录号WOS:001429381300001
出版者SCIENCE PRESS
源URL[http://ir.igsnrr.ac.cn/handle/311030/213319]  
专题资源与环境信息系统国家重点实验室_外文论文
通讯作者Zhang, Fanyu
作者单位1.Changan Univ, Sch Geol Engn & Geomat, Xian 710064, Peoples R China
2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing 100101, Peoples R China;
3.Lanzhou Univ, Coll Civil Engn & Mech, Key Lab Mech Disaster & Environm Western China, Lanzhou 730000, Peoples R China;
推荐引用方式
GB/T 7714		 Zhang, Tongwei,Li, Sheng,Lan, Hengxing,et al. Influences of strain rate on mechanical behaviors of unsaturated and quasi-saturated loess under varying drainage conditions[J]. JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,2025,17(2):1163-1181.
APA Zhang, Tongwei,Li, Sheng,Lan, Hengxing,Zhang, Huyuan,&Zhang, Fanyu.(2025).Influences of strain rate on mechanical behaviors of unsaturated and quasi-saturated loess under varying drainage conditions.JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,17(2),1163-1181.
MLA Zhang, Tongwei,et al."Influences of strain rate on mechanical behaviors of unsaturated and quasi-saturated loess under varying drainage conditions".JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 17.2(2025):1163-1181.

入库方式： OAI收割

来源：地理科学与资源研究所

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