基于多场耦合的堤坝稳定性数值模拟

Numerical Simulation of Dam Stability Based on Multi-field Coupling

堤坝是重要的防水建筑物之一,尤其是在洪水泛滥地区,其稳定性直接关乎下游人民生命财产安全。采用多场耦合理论,考虑了地下水流体力学方程,以及热力场和水力场的数值方程,分析了不同水位深度下坝体内部的温度、孔压以及位移的变化情况。研究成果表明,使用热传感器代替更昂贵的孔隙压力传感器来探测坝体渗流是可能的,但需要将传感器放置在不受每日温度变化影响的区域。同时,当水库出水速度最快时,FOS值最低,该阶段导致坝体稳定性从3.5降至3.0。

The dike is one of the important waterproof buildings,especially in the flooded area.Its stability is directly related to the safety of people's life and property downstream.In this paper,the multi-field coupling theory is used to analyze the changes of temperature,pore water pressure and displacement in the dam body at different water levels,taking into account the hydrodynamic equations of groundwater,as well as the numerical equations of thermal and hydraulic fields.The research results show that it is possible to use thermal sensors instead of more expensive pore pressure sensors to detect dam seepage,but the sensors should be placed in areas that are not affected by daily temperature changes.At the same time,when the water outflow rate of the reservoir is the highest,the FOS value is the lowest and the stability of the dam body is reduced from 3.5 to 3.0 at this stage.