略论重力坝抗剪摩擦系数的选择

在我国,岩基上重力坝的抗滑稳定往,以往普遍采用不计及凝聚力的摩擦公式计算。抗剪摩擦系数(简称摩擦系数)值的大小,对重力坝工程的安全性与经济性的影响颇大。本文目地在于:1、论证我国重力坝的抗剪摩擦系数取值一般偏低,2、提出抗剪摩擦系数的推荐值供中小型重力坝工程设计中使用,以求降低工程造价。

A Wise Selection of the Friction Coefficient of Gravity Dams on Rock Foundations

The stability of giavity dams on rock foundations are generally ex- pressed in terms of its factor of safety against sliding, the ratio of the frictional force along the foundation to the force tending to cause slid- ing, but the cohesive force is neglected.It has merely been expressed as K_s=f·∑V/∑H ·Where f is the coefficient of friction between the dam and its foundation,∑H the summation of horizontal forces acting on the gravity dam and ∑V the summation of vertical forces acting on it. It is obvious that the value of friction coefficent greatly affects safety and economy of a dam. In this article the author pointed out that the values of friction coefficient of gravity dams adopted in China were rather too small, and proposed some experimental data in designing for various types of dams of small and medium-sized reservoirs so as to reduce the construction cost.