管漏产生的渗流水受挡水效应后对产生渗蚀的影响

Influence of water retaining effect on the erosion caused by pipe leakage

为研究水力管线渗漏渗蚀产生的流动效应受地下构筑物阻挡后对形成渗蚀的影响,在流固双向耦合原理基础上,用离散单元法模拟管线渗漏流经地下构筑物的过程。用PFC模拟渗流水与地下构筑物相接触时产生的绕流现象,用Fluid Dynamics Simulation模拟绕流的完整过程。结果表明:渗流水在流经地下构筑物时会产生绕流现象;相同条件下渗流水流经构筑物时绕流速度不同,圆形构筑物的绕流速度最大,长方形构筑物的绕流速度最小;地下构筑物对渗流的阻挡效应强弱与构筑物的挡水宽度成正比,长方形构筑物的挡水效应最优,圆形构筑物的挡水效应最差。

In order to study the influence of the flow effect caused by the leakage and erosion of the hydraulic pipeline on the formation of the erosion after being blocked by the underground structure,the process of pipeline leakage and flow through the underground structure is simulated by the discrete element method on the basis of the principle of fluid-solid two-way coupling.PFC is used to simulate the flow of seepage water when it comes into contact with underground structures,and Fluid Dynamics Simulation is used to simulate the complete process of flow flow.The results show that the seepage water will circulate when it flows through the underground structure.The circulatory velocity of the seepage water is the largest for the circular structure and the smallest for the rectangular structure,when the seepage water flows through the structure under the same conditions.The blocking effect of the underground structure on the seepage is proportional to the water retaining width of the structure,the water retaining effect of the rectangular structure is the best,and the water retaining effect of the circular structure is the worst.