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基于一系列同一温度、同一应变率、不同含水率和围压条件下的高含冰冻结粉质砂土的三轴循环加、卸载试验,开展了高含冰量冻结粉质砂土的能量耗散与剪切模量特性研究。试验结果表明:随着含水率的增加,冻土的塑性先增加,然后减小,并且30.6%的含水率可以作为一个塑性破坏点;随着剪应变的增加,偏应力的变化主导着能量耗散的变化,并且在试样变形过程中克服冰颗粒之间的作用所耗散的能量值很小;随着剪应变的增加,冻土的剪切模量一直减小,且小含水率条件下减小的速率会有一个明显的转折点,并且含水率对剪切模量的影响可分为3类。该研究结果可为高含冰冻土区工程设计中参数的选择提供重要的依据。
Based on a series of three-axis cyclic loading and unloading tests of frozen igneous silty sand at the same temperature, same strain rate, different water content and confining pressure, the energy dissipation and shear of frozen igneous sandy silt with high ice content Study of Modulus Properties. The experimental results show that the plasticity of frozen soil first increases and then decreases with the increase of moisture content, and the moisture content of 30.6% can be used as a plastic failure point. With the increase of shear strain, the change of deviatoric stress dominates the energy consumption And the amount of energy dissipated by the interaction between the ice particles in the sample deformation process is very small. With the increase of shear strain, the shear modulus of the frozen soil decreases, and the condition of small moisture content There is a clear turning point for the rate of decrease, and the effect of moisture content on shear modulus can be divided into three categories. The results of this study can provide an important basis for the selection of parameters in engineering design of frozen soil-containing regions.