Research on Effects of Suction, Water Content and Dry Density on Shear Strength of Remolded Unsaturated Soils

The direct shear tests with controlled suction,water content and dry density equaling constants were conducted to study the effects of suction,water content and dry density on the shear strength of remolded unsaturated soil.The test results show that the cohesion of unsaturated soil has a linear increase with the increasing of suction;but the friction angle has little change with the change of suction.The cohesion and friction angle of unsaturated soil have a linear decrease with the increasing of water content;but the cohesion decreases more.The cohesion of unsaturated soil has an exponent increase with the increasing of dry density;but the friction angle has little change with the increasing of dry density.The comparison of the test results with controlled suction and water content equaling constants is carried out.The shear strength formula including impact of water content is proposed,which can be for reference in engineering application.