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土体抗剪强度指标是岩土工程中最重要的参数之一,抗剪强度指标选择是否合理以及对其离散性的评价与工程的安全经济直接关联。抗剪强度指标的概率分布类型又在一定程度上影响着风险评价和可靠度分析的结果。抗剪强度指标可以通过室内试验测定。本文通过GDS三轴仪进行CU(三轴固结不排水剪切)试验,测得软土抗剪强度,在此基础上利用K—S法对土体抗剪强度指标的概率分布类型进行了统计。分析表明一般情况下抗剪强度指标均可以接受正态分布和对数正态分布,而选择对数正态分布在更多情况下更为合理、简便,能够避免出现物理量为负的现象。
The shear strength index of soil is one of the most important parameters in geotechnical engineering. Whether the shear strength index is reasonable or not and the evaluation of its discreteness are directly related to the safety and economy of the project. The type of probability distribution of shear strength index affects the result of risk evaluation and reliability analysis to a certain extent. Shear strength indicators can be determined by laboratory tests. In this paper, the CU (triaxial consolidation undrained shear) test was carried out by GDS triaxial apparatus, and the shear strength of soft soil was measured. Based on this, K-S method was used to study the probability distribution of shear strength index of soil statistics. The analysis shows that under normal conditions, the shear strength index can accept the normal distribution and the logarithmic normal distribution, while the logarithmic normal distribution is more reasonable and simpler in many cases, which can avoid the phenomenon that the physical quantity is negative.