采用多年来积累的大量混凝土高坝基础原型观测资料，对岩体在长期技术成因影响下的性能进行了分析研究。岩体的变形过程，根据其特性的不同可分为三个阶段：第一阶段因大坝施工且水库不断蓄水，岩体承受荷载，其变形呈增长的趋势；第二阶段为“流变”阶段，岩体变形有规律地减小，岩体表面与深处的变形增量差缩小；在变形的第三阶段，水库水位的波动，导致岩体应为应变状态的变化。 Based on the observation data of a large number of concrete dam foundation prototypes accumulated over the years, the performance of rock mass under the influence of long-term technical causes is analyzed. The deformation process of rock mass can be divided into three stages according to its characteristics: in the first stage, due to the construction of the dam and continuous reservoir water storage, the deformation of the rock mass shows an increasing trend; the second stage is " Stage, the deformation of rock mass decreases regularly, and the difference of deformation increment between rock mass surface and depth decreases. In the third phase of deformation, the fluctuation of reservoir water level leads to the change of rock mass state.