非饱和重塑黄土抗剪强度影响因素的试验研究

通过直剪试验研究了非饱和重塑黄土在不同含水量、干密度与加荷等级情况下的粘聚力与内摩擦角变化，以确定含水量、干密度与加荷等级分别对非饱和重塑黄土抗剪强度的影响。从黄土矿物成分的微观角度分析了含水量与干密度对黄土抗剪强度造成影响的原因。受颗粒之间的相互作用与粒间水的张力作用，非饱和重塑黄土的粘聚力随干密度的增大而增大，呈指数变化；非饱和重塑黄土的内摩擦角随干密度的增大而少量增大，近似呈线性变化。

Test Study on Influence Factor of Shear Strength of Unsaturated Remolded Loess

Changes of cohesion and internal friction angle of unsaturated remolded loess are obtained with different water content, dry density and load grade through direct shear test. The reason for the influence caused by water content and dry density on the loess~ shear strength is analyzed from the microcosmic angle of loess＇s mineral composition. The cohesion of unsaturated remolded loess will increase with the increment of dry density due to the influence of reciprocity of particles and tension action of inter-granular water, showing an index change. Internal friction angle of unsaturated remolded loess gets a little increase with the increment of dry den- sity, approximately showing a linear variation.