结构面抗剪强度参数对岩质边坡稳定的影响

边坡工程中,结构面抗剪强度是非常重要的力学参数,合理地选择确定抗剪强度的方法,常常要分析c、值在边坡稳定中的作用。根据极限平衡原理,对10~30m高的平面滑动型边坡不同抗剪强度的控稳结构面c、值在边坡稳定中的作用进行了定量分析。研究表明c值对稳定系数的影响随坡高增大逐渐减弱,值对稳定系数的影响随坡高增大逐渐增强。得到了不同坡高下c、值边坡稳定作用等值曲线,该曲线很容易确定抗剪强度参数c、值在边坡稳定中的作用。

EFFECTS OF SHEAR STRENGTH PARAMETERS OF DISCONTINUITIES ON STABILITY OF ROCK SLOPE

Shear strength of rock discontinuities is an important parameter in landslide prevention . It is necessary to study the effects of the two shear strength parameters, i.e., the cohesion c and the internal friction angle , in order to choose a suitable method for determining the shear strength parameter values of rock discontinuities. This paper focuses on the effects of the shear strength parameters of control discontinuities on the stability of rock slopes from 10 to 30 m high, where the limit equilibrium theory is used. The results show that the effect of the cohesion reduces with increasing in slope height and the effect of the internal friction angle increases with increasing in slope height. A group of curves are presented. The effect of the cohesion and the effect of the internal friction angle are equivalent on the curves. The effects of the cohesion c and internal friction angle on slope stability can be easily analyzied with the aid of the curves.