关键词: 冻结粉质粘土, 低围压, 三轴抗剪强度, 变形特性, 应变速率, 变形模量

Abstract: High and low confining pressures have different effects on the deformational properties and mechanical index of frozen soil. Triaxial compression tests were carried out for frozen silty clay under three different temperatures and four confining pressures at different strain rates. The test results indicate that the stress-strain curves behave in the same form under different confining pressures and different strain rates at the same temperature of frozen soil; the triaxial shear strength has a linear relationship with confining pressure and temperature, and an exponential relationship with strain rate; the deformation modulus, independent of confining pressure, has a linear relationship with temperature, and an exponential relationship with strain rates. And then the deformational property is explained from the viewpoint of structural changes of frozen soil.

Key words: frozen silty clay, low confining pressure, triaxial shear strength, deformation property, strain rate, deformation modulus