非饱和击实膨胀土总应力强度探讨

 根据实际工程情况，运用非饱和土的固结快剪，对不同起始密度、含水量的击实膨胀土进行了抗剪强度试验研究，探讨了非饱和膨胀土在总应力状态下的抗剪强度特性。认为总应力强度随干密度的增大和含水量的减小而变大；内摩擦角随含水量的变化较小，而凝聚力变化较大。

Discussion on Shear Strength of Total Stress of Unsaturated Compacted Expansive Soil

Based on the engineering practice, experimental studies were performed for compacted expansive soils of different initial densities and moisture contents with the consolidated quick direct shear test method of unsaturated soils. The characteristics of shear strength of unsaturated soil under the condition of total stress were discussed. The results indicated that the strength of total stress increases with accretion of dry density and with decrease of moisture content; the changes in internal friction angles with moisture contents are small, but, the changes in cohesive forces are rather lager.