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Shear strength of purple soil bunds under different soil water contents and dry densities: A case study in the Three Gorges Reservoir Area, China
Wei Jie1,2; Shi Binglin1; Li Jinlin1,3; Li Shasha1; He Xiubin
2018-07-01
Source PublicationCATENA
ISSN0341-8162
Volume166Pages:124-133
AbstractPurple soil bunds are embankments constructed along the contour on purple soil sloping farmlands, and play a key role in controlling soil erosion. The soil shear strength makes a significant influence to the bund stability; however, few reports have documented how purple soil shear strength responds to the soil physical properties. The main goal of the present study was to determine how indicators of soil shear strength vary with the soil water content and dry density. In this study, we collected soil samples from 3 purple soil bunds in Zhong County, in the Three Gorges Reservoir Area in China, and performed an unconsolidated undrained triaxial compression test to study the soil shear strength in terms of the cohesion (c), internal friction angle (phi), and the principal stress difference (sigma(1)-sigma(3)). The test results show that when the dry density was constant and the soil water content increased, the soil cohesion increased and then decreased, and the results fitted to a quadratic curve. As the soil water content increased, the internal friction angle of the soil bunds decreased and displayed a first-order exponential decay. As the soil water content increased and the confining pressure remained constant, the principal stress difference decreased rapidly. When the soil water content was constant and the dry density increased, the soil cohesion, internal friction angle, and the total principal stress difference increased, although at different rates. In general, the water content had a greater effect on the cohesion, internal friction angle, and the principal stress difference than the dry density, but there were little or no interaction between water content and dry density. Furthermore, except when the water content was 6%, the stress strain characteristics were similar across the range of water contents. For a low water content, fixed confining pressure, and an increasing dry density, the curves gradually changed from the hardening type to the weak hardening type and then to the softening type. In most cases the curves corresponded with the hardening type as the confining pressure increased.
KeywordPurple soil bunds Soil water content Dry density Shear strength Interactive effect
DOI10.1016/j.catena.2018.03.021
WOS KeywordSOUTHWESTERN CHINA ; NORTHERN ETHIOPIA ; CONCENTRATED FLOW ; STONE BUNDS ; SANDY SOIL ; EROSION ; HIGHLANDS ; MOISTURE ; BEHAVIOR ; TIGRAY
Language英语
Funding ProjectNational Natural Science Foundation of China[41471234] ; Chongqing Research Program of Basic Research and Frontier Technology[cstc2015jcyjBX0141] ; Chongqing Education Commission[KJ1500315]
WOS Research AreaGeology ; Agriculture ; Water Resources
WOS SubjectGeosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS IDWOS:000434238800012
Funding OrganizationNational Natural Science Foundation of China ; Chongqing Research Program of Basic Research and Frontier Technology ; Chongqing Education Commission
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/23024
Collection中国科学院水利部成都山地灾害与环境研究所
Corresponding AuthorWei Jie
Affiliation1.Chongqing Normal Univ, Sch Geog & Tourism Sci, Chongqing 401331, Peoples R China
2.Three Gorges Reservoir Area, Chongqing Key Lab Surface Proc & Environm Remote, Chongqing 401331, Peoples R China
3.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Peoples R China
Recommended Citation
GB/T 7714
Wei Jie,Shi Binglin,Li Jinlin,et al. Shear strength of purple soil bunds under different soil water contents and dry densities: A case study in the Three Gorges Reservoir Area, China[J]. CATENA,2018,166:124-133.
APA Wei Jie,Shi Binglin,Li Jinlin,Li Shasha,&He Xiubin.(2018).Shear strength of purple soil bunds under different soil water contents and dry densities: A case study in the Three Gorges Reservoir Area, China.CATENA,166,124-133.
MLA Wei Jie,et al."Shear strength of purple soil bunds under different soil water contents and dry densities: A case study in the Three Gorges Reservoir Area, China".CATENA 166(2018):124-133.
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