水分对崩岗土体抗剪切特性的影响

Influence of Soil Moisture Content on Shear Characteristics of Benggang

通过三轴剪切实验研究崩岗不同土层抗剪特性随土壤水分含量变化的规律。结果表明:(1)随着土壤含水量的增加,红土层粘聚力逐步增大,当含水量达到22%后,粘聚力急剧下降;砂土层的粘聚力随含水量的增大而呈现先增大后减小的趋势,但粘聚力变化幅度较小,碎屑层的粘聚力随含水量变化呈波动性变化。(2)3个土层的内摩擦角均随着含水量的增加而减小。(3)3个土层的抗剪强度也随含水量的增加而逐渐减小。

This study analyzed the regularity of shear strength characteristics variation with soil moisture content in different soil layers by using a tri-axial shear test.The results showed that：（1）With the increase of soil moisture content,the cohesive force in red soil layer increased gradually.However,cohesive force fell sharply when the soil moisture contents reached over 22%.With the increase of soil moisture content in sandy soil layer,the cohesive force showed a trend of decrease after the first increase,but the variation of the cohesive force was small.The cohesive force in the detritus layer changed in a fluctuating.（2）The internal friction angle decreased with the increase of soil moisture content in three layer soils.（3）The shear strength decreased with the increase of soil moisture content.