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在-6℃的温度下对含盐量为0.5%的冻结粉质砂土在0.3~18 MPa的围压进行了三轴压缩试验,试验结果表明,低围压下围压对应力-应变曲线影响明显,随围压的增大,这种影响逐渐减弱;强度随围压的变化规律可分为3个阶段,分别为强度快速增长阶段、强度缓慢增长阶段、强度降低阶段;初始切线模量E0和0.5倍强度处割线模量E0.5随围压的变化规律均可分为3个阶段,第1和第2阶段均随围压增大而增大,且第2阶段变化率均较第1阶段大,第3阶段随围压增大而减小,但E0.5在整个围压范围内随围压的变化率均较初始模量小,在工程计算中若采用E0.5作为变形指标可在较大围压范围内取常数,而E0必须考虑围压的影响。
Triaxial compression tests were carried out at a temperature of -6 ℃ on the confined pressure of 0.3% to 18 MPa for the frozen silty sand with salt content of 0.5%. The experimental results show that the confining pressure under low confining pressure has a significant effect on the stress-strain curve The influence is obvious. With the increase of confining pressure, the influence is gradually weakened. The variation of strength with confining pressure can be divided into three stages: rapid strength growth stage, slow strength growth stage and strength reduction stage. The initial tangent modulus E0 and 0.5 times the intensity of the secant modulus E0.5 changes with confining pressure can be divided into three stages, the first and second stages with the confining pressure increases, and the second stage of the rate of change are Compared with the first stage, the third stage decreases with the increase of confining pressure, but the change rate of E0.5 with the confining pressure in the whole confining pressure range is smaller than the initial modulus. If E0.5 As a deformation index can take a larger confining pressure within the range, and E0 must consider the impact of confining pressure.