考虑流固耦合的水位降落期坝坡稳定分析

Analysis of Dam Slope Stability During Drawdown of Reservoir Water Level Considering Fluid-solid Coupling

水位降落期的土石坝坝坡稳定性是土石坝设计和除险加固设计中的重要内容之一,为了能够准确合理地分析水位降落期土石坝的坝坡稳定性,采用基于非饱和土流固耦合理论的有限元法对某病险水库进行了水位降落期的坝坡稳定分析,与传统的极限平衡法的计算结果进行了对比,同时分析了材料参数对坝坡稳定性的影响.结果表明基于非饱和土流固耦合理论的有限元法是一种方便合理的计算方法,计算出的孔隙水压力分布和坝坡稳定系数更加符合实际;材料的内摩擦角和粘聚力对坝坡稳定系数影响较大,泊松比影响相对较小,弹性模量几乎无影响.

Analysis of earth-rock dam slope stability during drawdown of reservoir water level is one of important contents in earth-rock dam design and reinforcement projects. In order to accurately and reasonably analyze the dam slope stability during drawdown of reservoir water level, this paper app method to analyze the dam slope stability for a dilapidated reservoir, based on the fluid-sol le d s finite element coupling theory of unsaturated soil. The results are compared with the traditional limit equilibrium method. The effect of material parameters on slope stability is analyzed. The results show that the finite element method based on unsaturated soil fluid-solid coupling theory is an convenient and reasonable method. The distribution of pore water pressure and the stability factor of dam slope calculated by this method are well consistent with practice. The internal friction angle and the cohesion has much larger influence on the stability factor of dam slope; the Poisson＇s ratio has relatively small influence ,but the Young＇s modulus almost has no influence on the stability factor.