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以往混凝土重力坝坝基抗滑稳定可靠度分析大多只研究单滑面或双滑面的情形,但通常的地质条件下,基岩内可能存在多滑面失稳,目前关于重力坝多滑面抗滑稳定可靠度的研究成果相对较少。本文在刚体极限平衡等安全系数法的基础上,提出了基于微粒群算法的重力坝坝基深层多滑面抗滑稳定可靠度计算方法,该方法能够处理非线性隐式功能函数的可靠指标计算问题,即根据可靠指标的几何涵义,将可靠度计算转化为约束优化问题,从而实现智能优化计算。3个算例分析表明,该方法计算工作量少,精度和计算效率高,算法适用性广,能够应用到复杂的坝基多滑面抗滑稳定可靠度计算中。工程实例分析表明,该方法具有较高的实用价值,可为重力坝稳定安全评价方法的深入研究与重力坝结构设计提供新的思路和技术支撑。
In the past, the reliability analysis of anti-sliding stability of concrete gravity dam foundation mostly only studied on single sliding surface or double sliding surface. However, under normal geological conditions, there may be multiple sliding surface instability in the bedrock. At present, The research results of stability and reliability are relatively few. Based on the method of safety coefficient such as limit equilibrium of rigid body, this paper proposes a new method to calculate the stability of multi-slide sliding surface with multi-slip surface based on particle swarm optimization. This method can handle the calculation of reliable index of nonlinear implicit function , That is, according to the geometric meaning of reliable indicators, the reliability calculation will be transformed into a constrained optimization problem, so as to realize intelligent optimization calculation. The results of three examples show that this method has the advantages of less workload, high accuracy and computational efficiency, and wide applicability of the algorithm. It can be applied to the complex stability calculation of the multi-sliding surface with sliding stability. The engineering example shows that this method has high practical value and can provide new ideas and technical support for the further research on the method of stability and safety assessment of gravity dam and the design of gravity dam structure.