降雨作用下路基裂隙渗流分析

Study of characteristics of seepage of roadbed's fissures

为探讨路基裂隙在降雨作用下渗流特征及其对路基含水率影响作用,分析了路基裂隙产生的原因及土质裂隙特征,研究了土质裂隙渗流特点。根据降雨IEM及FDEM模型,推导了降雨作用下路基裂隙渗流公式。利用Hydrus渗流软件,分别模拟了路基中的裂隙及路堑边坡裂隙渗流下含水率分布状况特征。模拟结果表明,降雨过程中路基裂隙渗流能够较显著的改变局部路基含水率,在工程中值得重视。

The characteristics of seepage of roadbed＇s fissures and the effect of seepage on roadbed engineering are studied. Both the reasons that roadbed produced fissures and the characteristics of roadbed＇s fissures are analyzed; the seepage characteristics of soil terrenee fissures are studied too. For the instantaneous event model （IEM） and the infinite duration event model（FDEM） of rainfall, the formula of seepage of roadbed with the effect of rainfall is derived. The water content distributation in the subgrade leaded by the seepage of fissures of both in the subgrade and cut is modified, The results of numerical simulation show that the water content of roadbed will be changed to a certain extent with the effect of roadbed＇s seepage; and it should be paid much attention in the engineering accordingly.