中文摘要：

对电力行业现行重力坝规范中的抗滑极限状态设计方法进行了探讨，通过对传统刚体极限平衡法的剖析，明确了极限状态设计中作用和抗力函数的表达形式及矢量方向，提出了一种新的等K＇法，使坝基双滑面上下游块体具有同等安全系数和同等可靠概率的内涵。根据对多组方案可靠指标的试算比较，提出了具有定量标准的安全系数K’的计算公式及相应的允许指标，建议了一套相应分等分级的分项系数，并对其合理性进行了验证。

英文摘要：

The wedge stability analysis method specified in the Gravity Dam Design Code of China was discussed. Based on the mechanical mechanism of the traditional rigid limit equilibrium method, the correct expressions of action and resistance were educed and the directions of vectors were presented. A new approach of equal safety degree was proposed for the calculation of reliability index of gravity dams. Then, a safety formula and its allowable index were presented, and a set of corresponding partial coefficients, whose rationality were proven were also proposed.