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以那板心墙土石坝为例,基于多孔介质饱和—非饱和渗流基本原理,采用有限元方法对该坝在不同库水位升降速度条件下的瞬态渗流场进行了数值模拟,并将瞬态渗流场与极限平衡法相结合分析了坝坡的稳定性。结果表明,坝体渗流场的变化相对于库水位的变化具有明显的滞后性,该滞后性对库水位快速下降条件下的上游坝坡的稳定极为不利,而对库水位快速上升条件下的上游坝坡的稳定有利,为库水位变化对土石坝渗流场及坝坡稳定性分析评价提供了参考依据。
Taking the slab dam with core wall as an example, based on the basic principle of saturated-unsaturated seepage in porous media, the transient seepage field of the dam under the conditions of different reservoir water level ascending and descending speed was numerically simulated by finite element method. The seepage field and limit equilibrium method are combined to analyze the stability of dam slope. The results show that the change of the seepage field in the dam has obvious hysteresis with respect to the change of reservoir water level. This hysteresis is very unfavorable to the stability of the upstream dam slope under the condition of rapid decrease of reservoir water level. However, The slope stability is favorable, which provides a reference for the analysis and evaluation of seepage field and slope stability of earth-rock dam.