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对加入1%纳米硅的黏性砂土进行温度-2℃、围压0.3~18 MPa的常规三轴压缩试验。试验结果表明:掺入纳米硅的冻结黏性砂土强度明显提高,在σ3=3 M Pa时强度提高甚至达到130%。将强度随围压的变化分成三个阶段:强化阶段,压融阶段,残余阶段。试验应力-应变曲线具有应变软化特性,修正的Duncan-Chang双曲线模型与其吻合良好。通过对修正的Duncan-Chang双曲线模型进行微分,分析得到初始切线模量随围压的变化可分成强化、压融和残余三个阶段。
Conventional triaxial compression tests were carried out on cohesive sandy soil with 1% nano-silicon at a temperature of -2 ° C and a confining pressure of 0.3-18 MPa. The experimental results show that the strength of frozen clay with nano-silicon is obviously increased, and the strength even reaches 130% when σ3 = 3 M Pa. The intensity changes with the confining pressure is divided into three phases: strengthening phase, pressure-melting phase, residual phase. The experimental stress-strain curve has strain softening behavior, and the modified Duncan-Chang hyperbola model is in good agreement with it. By differentiating the modified Duncan-Chang hyperbola model, it is found that the initial tangent modulus can be divided into three stages: strengthening, ballasting and residual with the change of confining pressure.