基于分项系数的三滑裂面相等可靠余度重力坝深层抗滑稳定计算方法

The calculation method for stability against deep sliding with three sliding planes under the same reliability-surplus of gravity dam based on partial factor

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。

Based on the sliding surface shape in research documents , and considering limited state equilibri um equations of the bearing capacity on three sliding planes , the model of stability against deep sliding with three sliding planes has been established under the same reliability-surplus of gravity dam which con tained unknown angle values of sliding plane and resisting force between wedges. Relevant formulas of sta bility against sliding for partial factor were given , and the iteration method and process of evaluating equa tions with the same reliability-surplus limited condition were put up. With programming and comparing , it has been proved that the model is more scientific and reasonable than the double inclined wedge in press ing close to real projects , avoiding effects on artificial supposition , satisfying with mechanics equilibriums as well evaluating results of the minimum reliability surplus and process.