Influence of Soil Moisture Content on Shear Characteristics of Benggang

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.