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依据文献滑裂面形态,考虑3个滑裂面同时满足承载力极限状态平衡方程,建立了包含分界滑裂面倾角和抗力方向等未知量在内的三滑裂面等可靠余度重力坝深层抗滑稳定计算模型,推导相应分项系数法的三滑裂面抗滑稳定计算公式,提出等可靠度极值条件方程组迭代求解方法步骤。通过计算对比分析,阐明本文给出的三滑裂面计算模型,在贴近实际工程、避免人为假定因素影响、满足力学平衡条件和最小可靠余度数值成果及求解过程等方面均比双斜面法更科学合理。
According to the literature of the sliding surface morphology, considering the equilibrium state of the three sliding surfaces while satisfying the limit state of bearing capacity, a reliable residual depth of the gravity dam, including the slip angle of the boundary slip surface and the direction of the resistance force, is established. Sliding stability calculation model is deduced, and the formula of anti-skid stability of three sliding surfaces deduced by the corresponding sub-coefficient method is proposed. The iterative solution method steps such as the extreme reliability equations are proposed. Through the comparison and analysis of calculation, the calculation model of three slip surfaces given in this paper is clarified. Compared with the double bevel method, the calculation model of three slip surfaces given in this paper is more close to the actual project, avoiding the influence of artificial hypotheses, meeting the conditions of mechanical equilibrium and the numerical results and solving process of the minimum reliable redundancy Scientific and reasonable.