管道渗流对表层土壤影响的数值模拟

The numerical simulation on the influence of Pipe seepage to surface soil on the influence

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。研究表明管道泄漏后,压力对于表层土的影响极小,可以忽略不计。体积分数经过一定时间后,等值线形成一个正苹果形。由于重力作用y轴比x轴扩散快,之后油品最外层等值线到达表层土下缘,油品开始渗入表层土,密集的等值线继续向上扩散,当等值线前锋到到表层土上缘时外界就会发现有泄漏现象发生,但是最大等值线前锋并没有到达表层土。当表层区域都向表层有油品输出,并且比较密集的等值线前锋已经处在表层土,这时地表应该会出现油品液体的流动。再经过一段时间,外层等值线到达土壤最下缘,这就意味着开始有油品开始污染地下水。

The finite volume method,establish the buried pipeline leakage porous medium fluid-structure coupling mathematical model,the phase change of oil pipeline leakage under lateral pressure field and the volume fraction of the numerical simulation.Research shows that pipeline leakage,pressure for the influence of surface soil is tiny and is neglected.Volume fraction after a certain time,contour line form a positive apple shape.Due to the action of gravity y than x axis spread fast,after oil outermost contour to topsoil lower edge,oil began to seep into the surface soil,the dense contour to continue upward diffusion,when the contour striker to surface soil on edge.the outside world will find leakage phenomenon,but the biggest isoline striker does not reach the surface soil.When the surface area output oil to the surface,and to compare the intensive isoline striker has been in the surface soil,when the surface should be in the flow of the liquid product.in a period of time,the outer contour arrived at the lower edge of the soil,which means that the oil pollution of groundwater start.