摘要
为获得陇东地区非饱和原状黄土的变形和强度特性及相关参数,对不同基质吸力及不同净围压下的非饱和原状黄土进行了常含水率三轴剪切试验,研究常含水率下陇东地区非饱和原状黄土的变形特性、临界状态、强度参数及基质吸力变化特性。研究结果表明:不同基质吸力下,偏应力与体应变临界状态线均呈线性关系;p-q平面内的原状黄土强度包线可以归一为一条直线,且可近似用饱和土临界状态线表示;非饱和黄土的抗剪强度受基质吸力的影响,非饱和原状黄土的黏聚力随基质吸力的增大而增大,有效内摩擦角受基质吸力的影响较小,可近似为一常数;并对不同基质吸力下陇东地区非饱和原状黄土的弹性模量进行拟合。
In order to obtain the deformation and strength parameters and the other related parameters of unsaturated intact loess in Qingyang of Gansu,the triaxial shear tests under constant water content were performed for unsaturated intact loess with various initial matric suctions and various net confining pressures, and the deformation characteristics,critical state,strength parameters and matric suction variation characteristics of unsaturated intact loess were studied under the condition of constant water content. The results showed that under different initial matric suctions,critical states of deviatoric stress and body strain were linear relationship. Strength envelope of undisturbed loess in p-q plane could be normalized to a straight line,and it could be expressed approximately with the critical state line of saturated soil. The shear strength of unsaturated loess was influenced by matrix suction,and the cohesion of unsaturated loess increased with the increase of the matric suction; the effective internal friction angle was less affected by the matric suction,which could be approximated as a constant. The elastic modulus of unsaturated intact loess in Qingyang of Gansu was fitted under different matrix suction.
出处
《工业建筑》
CSCD
北大核心
2016年第11期122-126,共5页
Industrial Construction
基金
甘肃省建设科技攻关项目(JK2014-34)
关键词
陇东地区
非饱和原状黄土
三轴试验
基质吸力
变形
强度参数
the QingYang area of Gansu
unsaturated intact loess
triaxial shear test
matric suction
deformation
strength parameters
