合肥二级阶地黏土层物理力学指标概率统计及相关性分析

Probability Statistics and Correlation Analysis of Physical and Mechanical Indexes of Second Terrace Clay Layer in Hefei

为解决大型土建工程中岩土体物理力学参数不确定性和空间变异性等问题。基于合肥市地铁4号线岩土工程勘察成果,以合肥地区二级阶地同一地质单元晚更新世黏土层为研究对象,采用数理统计中常用的偏斜度和峰值法,对二级阶地黏土层的物理力学参数进行统计分析,确定其物理力学参数的概率分布模型;通过对各物理力学指标进行相关性分析,建立回归方程,得到黏土层各指标间的经验公式。研究表明,合肥二级阶地黏土层具有物理力学性质差异性较小、工程性质相近、多服从正态分布的特点,各指标间多表现为中等-较强相关性。

To solve problems of uncertainty and spatial variability of physical and mechanical parameters of soil and rock in large-scale civil engineering,based on the geotechnical engineering investigation results of Hefei Metro Line 4,this paper adopted the skewness and peak value methods commonly used in mathematical statistics to analyze the parameters of the clay layer on the second terrace,and determines the probability distribution model by taking the second terrace late pleistocene clay layer in Hefei as the research object.Through the correlation analysis of physical and mechanical indexes,the regression equation is established and the empirical formula between the indexes of the clay is obtained. The results show that the physical and mechanical parameters of clay layer in the second terrace of Hefei mainly follow the normal distribution,the correlation among the indexes is mainly medium-strong.