乐山浅切丘陵区粉质黏土物理力学参数概率分布特征

发布时间：2018-05-23 18:39

本文选题：粉质黏土 + 概率分布　；参考：《科学技术与工程》2016年32期

【摘要】：随着乐山城镇化建设延伸至浅切丘陵区,其广泛分布的第四系粉质黏土成为工程建设的地质背景。针对工程地质特性将其划分为常年饱水沟谷区坡洪积粉质黏土(A类)、季节性饱水沟谷区坡洪积粉质黏土(B类)以及沟缘、斜坡区残坡积粉质黏土(C类);并对三类粉质黏土部分物理力学参数变异性进行对比研究。基于χ2拟合优度检验及可靠性截断概率,建立了浅切丘陵区粉质黏土概率密度函数及其最优概率分布模型,给出了各类粉质黏土物理力学参数的建议取值范围。结果表明:1粉质黏土力学参数变异性物理参数,不同类粉质黏土参数变异性A类B类C类;2物理参数最优分布模型多为正态分布,力学参数最优分布模型多为对数正态分布;3对比不同类粉质黏土,B类、C类粉质黏土参数的最优分布模型多为正态分布,A类粉质黏土参数最优模型多为对数正态分布。以P=0.683为样本参数可靠性截断概率,给出了乐山浅切丘陵区粉质黏土参数建议值范围,为该地区岩土工程可靠性设计提供科学依据。
[Abstract]:As the urbanization of Leshan extends to the shallow-cut hilly area, its widely distributed Quaternary silty clay has become the geological background of engineering construction. According to the engineering geological characteristics, it can be divided into two categories: type A of silt clay in slope flood in the perennial saturated gully area and type B of silty clay in slope flood in seasonal saturated gully area) and furrow margin. The variation of partial physical and mechanical parameters of three kinds of silty clay is studied. Based on 蠂 2 goodness of fit test and reliability truncation probability, the probability density function and its optimal probability distribution model of silty clay in shallow-cut hilly region are established, and the suggested range of physical and mechanical parameters of various silty clay is given. The results show that the physical parameters of the mechanical parameters of the silty clay at the ratio of 1: 1 and the variation of the parameters of the silty clay of different kinds are normal distribution models of the best distribution models of the physical parameters of class A, class B, class C and C, respectively. The optimal distribution models of mechanical parameters are mostly logarithmic normal distribution. Compared with different kinds of silty clay, most of the optimal distribution models are normal distribution, class A silty clay parameters are logarithmic normal distribution. Based on the probability of reliability truncation of the sample parameters, the suggested range of the parameters of silty clay in the shallow-cut hilly area of Leshan is given, which provides a scientific basis for the reliability design of geotechnical engineering in this area.
【作者单位】：成都理工大学地质灾害防治与地质环境保护国家重点实验室;西部战区空军勘察设计院;
【基金】：国家自然科学基金项目(41172278)资助
【分类号】：TU442

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