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《China Earthquake Engineering Journal》 2016-04
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Effect of Intermediate Principal Stress on Strength and Deformation Characteristics of Compacted Loess

ZHANG Wu-yu;CHEN Wei;CHANG Li-jun;JIE Yu-xin;WANG Meng;LUO Chuan-qing;School of Civil Engineering,Qinghai University;Department of Geological Engineering,Qinghai University;State Key Laboratory of Hydroscience and Engineering,Tsinghua University;  
To study the impact of intermediate principal stress on the strength and deformation behavior of compacted loess,a series of tests with the principal stress orientation angle fixed at 0°were carried out using a hollow cylinder apparatus(HCA).The impact of the intermediate principal stress coefficient b on the strength and deformation of compacted loess is discussed.Test results revealed that at different intermediate principal stress coefficients,the developed models of generalized shear stress-strain curves were basically the same.The generalized shear stress-strain curves were not significantly different and the specimens showed significant ductility during the late stages of shear.The intermediate principal stress significantly affected the strength of the compacted loess.The normalized maximum strength was at b=0.25 and the minimum at b=0.5.The strength increased with b from 0to 0.25.The strength was at its peak when b=0.25,then decreased rapidly as b increased further.The minimum strength reached was when b=0.5,the strength first increased,then decreased as b increased further.With the increase in the intermediate principal stress coefficient,the effective internal friction angle of the compacted loess showed a tendency to increase.The strength parameter was at a minimum when b=0,a maximum when b=0.75,and was greater in b=1(triaxial tension)than b=0(triaxial compression).
【Fund】: 青海省科学技术厅应用基础研究计划(2015-ZJ-720;2012-Z-708);; 清华大学水沙科学与水利水电工程国家重点实验室开放研究基金项目(sklhse-2014-D-03);; 青海省高等学校地基与基础教研创新团队项目;; 青海大学教学名师培育计划项目
【CateGory Index】: TU444
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