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由于高温冻土内部含有大量随机分布的初始缺陷,从而使其力学性质具有明显的离散性和随机性.基于3种不同围压下的试验结果,利用K-S检验法对强度的概率分布进行了拟合检验,结果表明Weibull分布能较好地描述高温冻土的强度分布,随后对强度进行了可靠度分析.基于连续损伤理论和Drucker-Prager准则,建立了高温冻土的损伤统计本构模型.通过3种不同围压下的试验结果与之对比分析,表明该模型可以较好地反映出高温冻土应力应变曲线的变化过程.
Due to the large number of random defects in the interior of the permafrost, the mechanical properties of the permafrost are obviously discrete and random. Based on the test results under three different confining pressure, the probability distribution of strength is simulated by KS test The test results show that the Weibull distribution can describe the intensity distribution of the permafrost well and then analyze the reliability of the strength.The damage statistical constitutive model of the permafrost is established based on the continuous damage theory and the Drucker-Prager criterion. The comparison of the test results under three different confining pressures shows that the model can better reflect the change process of stress-strain curve of permafrost.