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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。
In the analysis of the rigid body limit equilibrium method for deep stability of dam foundation, the orientation of bedrock resistance under the limit state is taken as unknown value, and the relationship between the magnitude and direction of the maximum resistance is found from the concept of passive resistance of rock. This paper analyzes three conventional rigid body limit equilibrium methods from the point of view of failure mechanism, clarifies the rationality and applicability of the three safety factors, and points out that the possible mechanism of instability should be analyzed based on the actual engineering situation to limit the three rigid bodies. The balance method is reasonably combined, and different methods are selected for different stages before the instability, and the strength reserve coefficient is reduced in stages to obtain the comprehensive safety factor.