中文摘要：

基于533组花岗岩残积土土样的土工试验数据，研究了花岗岩残积土黏聚力、内摩擦角、压缩系数与常见物理指标之间的相关关系，分别采用经验方法和主成分分析方法建立了花岗岩残积土力学性质的联合概率密度函数．研究表明，花岗岩残积土黏聚力的离散性很大，难以准确预测．和黏聚力相比，内摩擦角和压缩系数的可预测性更强，内摩擦角和压缩系数之间存在一定的负相关性，黏聚力和内摩擦角、压缩系数的相关性较弱．采用经验法和主成分分析法建立的联合概率密度函数类似，验证了所提出的概率模型的可靠性．

英文摘要：

Based on 533 sets of laboratory test data, this paper studies the relationship between the total cohesion, friction angle, and the coefficient of compressibility and physical parameters of the completely de composed granite. Prohabilistic models are then constructed based on an empirical method and the principal component analysis method. It is found that the apparent cohesion is very difficult to predict. Compared with the total cohesion, the friction angle and the coefficient of compressibility is easier to predict. The friction angle is negatively correlated with the coefficient of compressibility. The correlation between the total cohesion and the friction angle as well as the correlation between the total cohesion and the coefficient of compressibility are quite weak. The prohabilistic models constructed based on the empirical method and the principle component analysis method are quite similar, so as to verify the reliability of the constructed models.