重塑黄土抗剪强度试验研究

Experimental study on shear strength of remolded loess

黄土强度问题是黄土地区工程建设问题研究的基础。以延安新区黄土为研究对象,对不同含水率、干密度的重塑黄土进行直剪试验,研究了含水率、干密度对重塑黄土抗剪强度的影响。结果表明,含水率和干密度是影响黄土抗剪强度的重要因素;重塑黄土的粘聚力随含水率的增加而减小,近似呈现指数关系;内摩擦角受含水量影响较小,变化在8°以内;粘聚力随干密度的增大而增大;内摩擦角随干密度的增大有增大趋势,近似呈线性变化。严格控制黄土含水率和干密度是保证工程基础稳定的前提。

The strength of loess is the basic engineering construction research problem in loess area. Taking loess of Yan＇an new district as the research object, direct shear tests of remolded loess with different moisture content and dry density were carried out, which determining the influence of moisture content and dry density on shear strength of remolded loess. The resuhs showed that water content and dry density are important factors affecting the shear strength of loess ;the cohesion of remolded loess decreases with the increasing of water content, approximately being exponential relationship;internal friction angle less affected by water content with the changes within 8 o ; cohesion enhances with the increasing of dry density ;internal friction angle has expanding trend with the increasing of dry density, approximately being linearly relationship. Making strict control on moisture content and drying density of loess are the premise to ensure a stable construction foundation.