刚体极限平衡法分析坝基深层抗滑稳定的探讨

在坝基深层抗滑稳定的刚体极限平衡法分析中,本文将基岩抗力在极限状态下的方向作为未知值,由岩石的被动抗力的概念,找出最大抗力的大小和方向之间的关系。本文从破坏机理的角度分析了三种常规刚体极限平衡法,阐明了三种安全系数的合理性、适用性,并指出:应该根据实际工程情况,分析可能的失稳机理,将三种刚体极限平衡法合理地结合起来,针对失稳前的不同阶段,分别选取不同的方法,分段降低强度储备系数,求出综合安全系数。

Rigid Block Methods for Study of Stability of Dam Foundation witk Weak Layers

In this paper,some rigid block methods for the analysis of stability of dam foundation with weak layers are discussed.The direction of the resistant force on the resistant block is considered to be unknown.Based on the Passive earth Pressure theory,the relation between the quantity of the maximum resistant force and its direction is found.Three kinds of rigid block methods are analysed from the failure mechanism.The reasonability and suitability of three kinds of safety factors are clarified.It is pointed out that the value of the safety factor should not be selected blindly,these rigid block methods should be combined reasonably and different methodes should be used at different steps before the loss of stability to evaluate the synthetical safety factors.