温度对季冻区粉质黏土强度及变形特性的影响.

In order to study the influence of temperature change on the strength and deformation of silty clay in natural state and saturated state, the silty clay widely distributed in typical seasonal frozen area was taken as the research object. The triaxial test of unsaturated soil in natural state and saturated silty clay under different temperature conditions was carried out by global digital system (GDS) unsaturated soil triaxial test system and GDS temperature-controlled static / dynamic triaxial test system. The experimental results show that the stress-strain curves of unsaturated and saturated silty clay show the characteristics of strain hardening. The cohesion of unsaturated silty clay increases with the decrease of temperature, while the internal friction angle decreases with the decrease of temperature, but the overall change trend is small. The cohesive force of saturated soil is the same as that of unsaturated soil. With the decrease of temperature, the cohesive force increases gradually, but the cohesive force is smaller than that of unsaturated soil at the same temperature, and the internal friction angle decreases first and then increases. When there is no vertical pressure, the axial deformation of unsaturated and saturated silty clay increases with the decrease of temperature under the same confining pressure, and the axial deformation of both decreases with the increase of confining pressure under the same temperature. The test results can provide theoretical basis for the design and construction of silty clay stratum engineering in seasonal frozen area. [ABSTRACT FROM AUTHOR]