低围压下冻结粉质粘土的三轴强度及变形分析

高围压和低围压对冻土的变形性能及力学指标有不同的影响。对冻结粉质粘土进行了3种负温、4种围压下的三轴试验。试验结果表明：在温度相同时，不同围压、不同应变速率下的应力-应变曲线具有相同的形态，其三轴抗剪强度与围压及温度有明显的线性关系，与应变速率成指数关系；变形模量与围压没有明显的相关关系，但与温度成线性关系，与应变速率成指数关系。而且从冻土结构角度分析了冻土变形及其强度表现的内在原因。

Triaxial strength and deformation properties of frozen silty clay under low confining pressure

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.