土石坝渗流与稳定性的数值模拟分析

Numerical Simulation Analysis of Seepage and Stability of Earth-rock Dam

我国水资源丰富,因此水库大坝兴建数量巨大,尤其是土石坝工程。随着大坝工程的进一步建造,大坝的渗流稳定性问题频发。对此,基于某实例土石坝工程,采用数值模拟的分析方式,使用COMSOL Multiphysics软件研究分析正常蓄水位和库水水位骤降至死水位过程中的坝体渗流和稳定性,并使用工程常用的理正软件来验证这一模型。结果表明:上游坝坡铺设的复合式土工膜使得正常蓄水位、库水位降落期的渗流浸润线位置均有所降低;土石坝在库水位降落时期、正常蓄水位时期的最大渗透比降均小于规定值,最小安全系数满足规范要求,大坝不会发生渗透破坏,大坝稳定性良好也没有滑坡危险;理正软件计算模型得到的结果与COMSOL Multiphysics软件计算得到的结论完全相同。结果可为类似工程提供参考作用。

My country is rich in water resources, so a huge number of reservoirs and dams have been built, especially earth-rock dam projects. With the further construction of the dam project, the dam seepage stability problems frequently occur. In this regard, based on an example of an earth-rock dam project, the analysis method of numerical simulation is adopted. The COMSOL Multiphysics software is used to study and analyze the seepage and stability of the dam body during the process of the normal water level and the reservoir water level plummeting to the dead water level, and the model is verified by using the Lizheng software commonly used in engineering. The results show that the composite geomembrane laid on the upstream dam slope reduces the position of the seepage infiltration line during the normal storage level and the reservoir water level fall period;The maximum seepage ratio of the earth-rock dam during the period of reservoir water level drop and normal water level is less than the specified value, the minimum safety factor meets the requirements of the specification, the dam will not suffer seepage damage, and the dam has good stability and no landslide danger. The results obtained by the Lizheng software calculation model are exactly the same as those obtained by the COMSOL Multiphysics software. It can provide reference for similar projects.