Abstract: On the basis of testing in Lab to loose earth in Chongqing reservoir,the authors present probability analysis of earth characteristics including physical and mechanic parameters,then propose and test the distributions of the characters.The results verify that interior friction angle φ obeys logarithm normal distribution while cohesion c,unit weight r and water ω obey normal distribution.Therefore,sensitive parameters testing in Lab are reliable.

Key words: loose earth, parameter, symbolic stat, normal, logarithm,χ\+2 imitative fittest, optimization

摘要： 岩土物理、力学参数最重要的性质是具有复杂的空间变异性和明显的不确定性,笔者将岩土的物理力学参数视为具有随机性和结构性特征的变量入手,运用数理统计方法对岩土的物理力学参数进行分析,统计结果显示,通过控制压实状态试验得到的岩土参数是可靠的

关键词: 松散土体, 参数, 数理统计, 正态, 对数正态, χ2拟合检验, 优化