三门峡地区黄土状粉土静力学特性试验研究  

Experimental Study on Static Mechanical Characteristics of Loess-like Silt in Sanmenxia Area

作　　者：宋日英[1] 陈宇[1] 

机构地区：[1]华北水利水电大学资源与环境学院,河南郑州450045

出　　处：《华北水利水电学院学报》2013年第4期10-13,共4页North China Institute of Water Conservancy and Hydroelectric Power

基　　金：国家自然科学基金资助项目(41140030);水利部公益性行业科研专项经费资助项目(201301034);郑州市创新型科技人才培育计划领军人才项目(10LJRC185)

摘　　要：以三门峡地区黄土状粉土为研究对象,通过控制重塑土样的干密度及含水率制备不同状态的试样,在非饱和土三轴仪上采用不排水试验法,对试样的静力学特性进行试验研究.试验结果表明:试样的基质吸力、水分状态及密度对土的力学性质有着重要影响,相同围压下土体破坏偏应力随着基质吸力的增大而升高;试样的黏聚力随含水率的增加而减小,且减小幅度在不同含水率区间有不同的变化规律;内摩擦角随含水率的增加呈现出先增加后减小的变化规律,并且其变化曲线出现双峰值点;试样的黏聚力及内摩擦角均随干密度的增加而增大,但不同的是黏聚力与干密度的关系曲线可用双曲线模型拟合,而内摩擦角与干密度的关系曲线呈现出非线性的变化规律.Taking loess-like silt in Sanmenxia area for the study,by controlling the dry density and soil moisture content of the remodeling soil samples to prepare samples in different states,using the undrained test method on the unsaturated soil triaxial test instrument,the test on the static mechanical properties is studied.The results are as follows： matric suction,moisture content and density of the test specimen have an important impact on the mechanical properties of soil.At the same confining pressure,the partial destruction stress of the test specimen increases with the matric suction increasing;the cohesion of the test specimen decreases with the moisture content increasing and the decreasing magnitude has different variation in the range of different moisture content.The internal friction angle shows a curve shape of first increasing and then decreasing with the moisture content increasing,and the curve has double peak points.The cohesion and internal friction angle of the samples both increase with the dry density increasing,but the difference is that the relation curve between the cohesive force and the dry density can be fitted by the hyperbolic model while the relation curve between the inner friction angle and the dry density shows the variation of non-linear.

关 键 词：黄土状粉土 静力学特性 基质吸力 干密度 含水率 破坏偏应力 黏聚力 内摩擦角 

分 类 号：TU411[建筑科学—岩土工程]