不同含水量下原状离石黄土的结构强度

1.西安科技大学 地质与环境学院,陕西 西安 710054; 2.商洛市地质环境监测中心站,陕西 商洛 726000; 3.长安大学 地质工程与测绘学院, 陕西 西安 710064

离石黄土; 含水量; 围压; 结构强度

Structural strength of the original Lishiloess under different water content
HE Qing-feng1,XU Zhi-hao1,GUO Liang2,ZHAO Fa-suo2

(1.College of Geology and Environment,Xi'an University of Science and Technology,Xi'an 710054,China; 2.Shangluo Institute of Geo-Environment Monitoring,Shangluo 726000,China; 3.College of Geological Engineering and Surveying,Chang'an University,Xi'an 710064,China)

Lishi loess; water content; confining pressure; structural strength

DOI: 10.13800/j.cnki.xakjdxxb.2017.0614

备注

对不同含水量的原状离石黄土进行了单轴和常规三轴压缩试验,研究了原状离石黄土的结构强度随含水量和围压的变化规律。试验表明,单轴压缩条件下离石黄土的结构强度随含水量的增加呈对数函数减少; 常规三轴压缩条件下离石黄土的结构强度受含水量和围压的影响显著。运用Mohr-Coulomb理论对原状离石黄土的强度参数(C,φ)与含水量的变化规律进行了研究,内聚力C随含水量的增加呈指数函数规律下降,摩擦系数tanφ随含水量的增加呈线性函数规律下降,期望该研究成果能为黄土地区的工程设计提供参考。

The structural strength is the most important mechanical index of loess,which depends on the degree of confining pressure and water content.The original Lishi loess under different water content are studied by the uniaxial compression test and the conventional triaxial compression test.The result shows that the structural strength decreases in logarithmic function with the increase of water content in the former test; It is influenced obviously by water content and confining pressure in the latter test.Based on the test,relationship equation between index of strength(C,φ)of Lishi loess and water content is built by Mohr-Coulomb Theory,the cohesive force C decreases exponentially with the increase of water content,the friction coefficient tanφ decreases linearly with the increase of water content,thus it can provide some references for engineering design in the loess area.