【摘要】 研究了重力坝多折面建基面的稳定评价问题,指出现行规范建议公式无法完整计算三维情况下的多折面建基面稳定安全性。为此,在对规范建议的结构极限承载能力验算表达式进行改进和探讨的基础上,采用分项系数对材料参数和作用进行配套处理,导出了基于有限元计算结果的极限平衡准安全系数计算表达式,同时采用强度储备系数法揭示坝体建基面破坏模式和稳定安全度。以极限平衡准安全系数法和强度储备系数法的联合应用构成定值安全度的综合评价体系。工程算例的结果表明,这两种方法判断准则简单适用并相互补充印证,能够较好评价多折面建基面的稳定安全性。更多还原

【Abstract】 The stability analysis of multi-zigzag plane base surface of concrete gravity dam is studied. For the equation specified in Gravity Dam Design Specification is not able to resolve the stability of three-dimensional base surface, a new limit equilibrium quasi-safety factor formula is educed for stability assessment, based on nonlinear finite element method (FEM) results. And the strength accumulation coefficient method is also adopted for investigation of damage model and safety checking. In those two methods the material parameters and loads are treated with each partial coefficient. Those two methods are suggested to use together for the base surface stability and an engineering project is given as example. The computation results show that these two methods are reasonable and convenient for the stability assessment of multi-zigzag plane base surface.更多还原