1　引　　言在岩土工程中经常需要进行稳定性分析、应力场和位移场计算以及结构变形预报,而在分析和计算中最棘手的问题是合理并切合实际地选取介质的材料物理力学参数(如容重、弹性模量、泊松比、内聚力和内摩擦角等)。为了监控混凝土重力坝的安全运行状态,需要建立大坝的安全 1 Introduction In geotechnical engineering, stability analysis, calculation of stress field and displacement field, and structural deformation prediction are often required. The most difficult problem in analysis and calculation is to select the material physical and mechanical parameters reasonably and practically (for example, Bulk density, elastic modulus, Poisson’s ratio, cohesion and internal friction angle, etc.). In order to monitor the safe operation of concrete gravity dam, it is necessary to establish dam safety