水分对渗流管道周围土壤影响的数值模拟

Numerical Simulation on Influence of Water on Soil Around the Seepage Pipe

采用有限容积法建立埋地管道泄漏多孔介质流固耦合相变数学模型,对油品管道下侧泄漏进行压力场和体积分数的数值模拟。通过对比多孔介质中含有10%的水分和90%空气以及只含空气两种情况进行对比,研究表明管道泄漏后,速度等值线随时间变化极小,可以忽略不计,但不含水的情况比含水的情况压力波扩散要快很多,而且时间越久表现越明显。体积分数在两种情况下差别很大,而其中含水的情况扩散速率更慢,与实际情况更接近。

The fluid-solid coupling mathematical model of buried pipeline leakage in porous medium was established by the finite volume method,pressure field and volume fraction under the leakage pipeline were numerically simulated.Simulated results in two kinds of porous media（one contained 10% water and 90% air and the other contained air only）were contrasted.The results show that the change of iso-velocity contour with time after pipeline leak is very small,and can be ignored.But the pressure wave diffusion in the porous medium without water is faster than that in the porous medium with water;the longer the time,the more obvious the phenomenon.Volume fractions under above two conditions have big difference;the diffusion rate in the porous medium with water is slower than that in the porous medium without water,which is closer to the actual situation.