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为了研究土石坝在洪水作用下的渗流稳定性,依托实际水库工程,以土石坝的坝体为主体,重点考虑洪水、水库、泄洪洞模型输入输出的约束关系,建立了该土石坝洪水过程的结构图仿真模型,并计算得到了在典型洪水过程中水库水位变化曲线;在此基础上采用有限元法,考虑非饱和区的影响,对土石坝非稳定渗流场进行了模拟;利用暂态渗流场计算结果,运用Morgenstern-Price法计算分析了土石坝上、下游坝坡的稳定性。结果表明:上、下游坝坡的稳定系数变化趋势与库水位一致,即坝坡稳定系数随库水位的上升而增大,随库水位的下降而减小。库水位变化的结构图仿真、渗流计算、稳定系数计算构建了较为完整的解决方案,为洪水作用下的土石坝渗流稳定性分析提供了新的手段。
In order to study the seepage stability of earth-rockfill dam under the action of flood, relying on the actual reservoir project, taking the dam body of earth-rock dam as the main body, the constraint relation between input and output of flood, reservoir and spillway tunnel model was mainly considered, The simulation model of structure and the calculation of the curve of reservoir water level during the typical flood process. Based on this, the unsteady seepage field of earth-rock dam is simulated by the finite element method considering the influence of unsaturated zone. Field calculations, the use of Morgenstern-Price method to calculate the stability of dam slope upstream and downstream dam. The results show that the variation trend of stability coefficient of upstream and downstream slope is consistent with the reservoir water level, that is, the slope stability coefficient increases with the rise of reservoir water level and decreases with the decrease of reservoir water level. The simulation of seepage flow, the calculation of seepage flow and the calculation of stability coefficient of the reservoir water level are used to construct a more complete solution, which provides a new method for the seepage stability analysis of earth-rock dam under flood conditions.