3种特殊土物理力学性质指标统计分析

Statistical Analysis of Physical and Mechanical Properties of Three Special Soils

常规物理力学指标可以良好反映土的工程性质。收集全国范围内软土、黄土和红土的相关专著、科技论文和地震安全性评价报告,统计得出3种特殊土各项物理力学指标的范围、平均值和变异系数,通过对各项物理力学指标间的相关性分析,对3种特殊土的工程特性进行了研究。对比结果发现:3种特殊土物理性质的变异系数总体较小、较为稳定,而力学性质的变异系数变化较大、离散程度较高;3种特殊土各项物理力学性质指标间存在相关性,或呈线性关系,或呈带状变化,同类指标软土和红土的相关系数高于黄土。通过回归拟合方法给出了|r|∈[0.5, 1.0]的拟合公式,利用线性关系检验方法对公式的精度和准确性进行检验,结果表明:本文给出的拟合公式F>F_(0.05),回归效果较为显著,便于工程应用。

Conventional physical and mechanical indicators can well reflect the engineering properties of soil. Through collecting relevant monographs, scientific papers, and seismic safety evaluation reports on soft soil, loess and red soil national widely, the statistics of the range, average value, and coefficient of variation of various physical and mechanical indicators of the three special soils were obtained. Based on the correlation analysis between the indicators, the engineering characteristics of the three special soils were studied. The comparison results show that the coefficient of variation of the physical properties of the three special soils is generally small and relatively stable, while the coefficient of variation of the mechanical properties varies greatly and discretely;There is a correlation between the physical and mechanical properties of the three special soils, either in a linear, or a belt-like change;The correlation coefficients of similar indicators of soft soil and red soil are higher than that of loess. The fitting formula of |r|∈[0.5, 1.0] is given by the regression fitting method used to test the precision and accuracy of the formula based on the linear relationship test. The results show that the F values of the fitting formula given in this paper are all greater than F_(0.05),it can be seen that the regression effect is more obvious, which is convenient for engineering application.