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重力坝坝基的抗滑稳定是大坝设计中首先要解决的关键问题,但是以往的坝基深层抗滑稳定可靠度研究中关于多滑面情况的研究成果偏少,主要原因是多滑面稳定可靠度计算的功能函数往往为隐式非线性,问题相对复杂、计算求解困难。根据可靠指标的几何涵义,将可靠度计算作为优化问题求解,从而引入遗传算法,提出基于遗传算法的重力坝坝基深层抗滑稳定可靠度计算方法。该方法避免功能函数需要表达为显式函数的限制,从而能够克服现行设计标准或规范中一次二阶矩方法适用性的不足,可用于多滑面情况的重力坝坝基抗滑稳定可靠度研究。算例和工程实例分析表明,该方法计算工作量少,精度和计算效率高,能同时满足具有显式或隐式功能函数的复杂工程结构可靠度计算,体现出常规可靠度计算方法不具备的优势,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。
The anti-sliding stability of gravity dam foundation is the key problem to be solved first in dam design. However, the previous research on stability of deep anti-sliding dam foundation is less than that of multi-sliding surface. The main reason is that multi-sliding surface is stable and reliable The function of degree calculation is often implicit nonlinear, the problem is relatively complicated, and the calculation is difficult to solve. According to the geometric meanings of reliable indexes, the reliability calculation is taken as the optimization problem, and then the genetic algorithm is introduced to propose the calculation method of the stability of the deep anti-sliding stability of gravity dam foundation based on genetic algorithm. This method avoids the limitation that function function needs to be expressed as an explicit function, so that it can overcome the insufficiency of the applicability of the first-order moment method in the current design standards or specifications and can be used to study the stability of anti-slide stability of gravity dam foundation. The analysis of examples and engineering examples shows that this method has the advantages of less workload, high accuracy and high computational efficiency, and can simultaneously satisfy the reliability calculation of complex engineering structures with explicit or implicit functional functions, which shows that the method of conventional reliability calculation does not have Which can provide new ideas and technical support for the further research on the method of stability and safety evaluation of gravity dam and the design of gravity dam structure.