接触面抗剪断强度离散性对重力坝稳定的影响

混凝土重力坝沿滑移面的抗滑稳定性与接触面材料的摩擦系数f和黏聚力c密切相关，现有的重力坝规范，有的取f和c为定值进行分析，有的视f和c为随机变量，并规定了它们的随机分布规律.实际上，f和c既不是一个定值，也不一定符合给定的随机分布规律.关于重力坝抗滑稳定安全系数分布规律的研究成果甚少.应用可靠性方法，针对重力坝沿建基面的抗滑稳定问题，研究了摩擦系数f与黏聚力c的随机分布线型、均值和变异系数对稳定安全系数K的影响，揭示了K的离散特征，以及概率分布曲线和可靠指标的变化规律.研究成果有助于对重力坝规范的进一步认识.

Impacts of shear strength discreteness along contact surface of dam on gravity dam stability

Stability against sliding along the slide plane of concrete gravity dams is closely related to the friction coefficient f and cohesion c of the contact surface. In design criterion of the gravity dams， sometimes f and c are regarded as the constant values, and sometimes regarded as random variables where distribution is specified. In fact，f and c are not constant or don′t accord with a given distribution. For the distribution of the stability safety factor against sliding of the gravity dam, very little research achievements can be found. In this paper， aiming at problems of stability against sliding along the foundation base of the concrete gravity dams， a reliability method is used in the studies of the effect on the stability safety factor K brought by the random distribution linear， the mean values and coefficients of variation of the friction coefficient f and cohesion c， revealing the discrete character and the varying patterns of the probability distribution curves and reliability index. The research results will contribute to the further recognition of the design criterion of the gravity dams.