Mechanical characteristics of intact Middle Pleistocene Epoch loess in northwestern China  

作　　者：钟祖良 刘新荣 

机构地区：[1]College of Civil Engineering,Chongqing University [2]Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education,Chongqing University

出　　处：《Journal of Central South University》2012年第4期1163-1168,共6页中南大学学报（英文版）

基　　金：Project(2009BB6350) supported by the Chongqing Municipal Natural Science Foundation,China;Project(50921063) supported by the National Natural Science Foundation for Innovative Research Team of China;Project(51108485) supported by the National Natural Science Foundation of China

摘　　要：In order to research the mechanical characteristics of intact Middle Pleistocene Epoch loess, triaxial shear tests and isotonic compression test of intact Middle Pleistocene Epoch loess were conducted by improved SJ-IA triaxial shear equipment. According to test results, it can be found that the intact Middle Pleistocene Epoch loess has the properties of shear dilatancy and shear shrinkage. With the increase of confining pressure, stress-strain curve develops from softening to hardening. The failure mode of intact Middle Pleistocene Epoch loess is shear failure with the rupture angle between 55° and 61°. And it is better to determine the yield stress （py, qy） of the intact loess under different confining pressures by using the εv-q/p curve. Along with the increase of confining pressure, yield deviatoric stress qy and yield spherical stress py present logarithmic relationship. Besides, the strength parameters, elastic modulus K and G of intact loess, are obtained, which are benefit for loess projects design.In order to research the mechanical characteristics of intact Middle Pleistocene Epoch loess,triaxial shear tests and isotonic compression test of intact Middle Pleistocene Epoch loess were conducted by improved SJ-1A triaxial shear equipment.According to test results,it can be found that the intact Middle Pleistocene Epoch loess has the properties of shear dilatancy and shear shrinkage.With the increase of confining pressure,stress?strain curve develops from softening to hardening.The failure mode of intact Middle Pleistocene Epoch loess is shear failure with the rupture angle between 55° and 61°.And it is better to determine the yield stress(py,qy) of the intact loess under different confining pressures by using the εv-q/p curve.Along with the increase of confining pressure,yield deviatoric stress qy and yield spherical stress py present logarithmic relationship.Besides,the strength parameters,elastic modulus K and G of intact loess,are obtained,which are benefit for loess projects design.

关 键 词：yield stress compression testing failure model Middle Pleistocene Epoch loess 

分 类 号：TU411.3[建筑科学—岩土工程] P534.631[建筑科学—土工工程]