不同降雨模式下土质边坡渗流场分析的数值模拟研究

为准确分析短期强降雨、长期弱降雨和周期性降雨中哪种降雨模式对土质边坡渗流场的影响最大,根据非饱和土渗透系数和饱和土渗透系数的对应关系,该文利用FLAC3D软件监测降雨入渗过程中的地下水位,并用FISH语言实时更新非饱和土的渗透系数,进而确定边坡内部的渗流场变化规律。在广西平陆运河边坡工程现场中监测坡面土质含水量的变化,并将数值模拟结果与现场试验数据进行比较,验证数值模拟结果的可靠性。通过该文提出的数值模拟分析程序,绘出在不同降雨模式下边坡上非饱和土的渗流特征情况,研究结果可指导边坡工程在降雨过程中制定支护方案。

In order to accurately analyze which rainfall mode has the greatest influence on the seepage field of soil slope among short-term heavy rainfall,long-term weak rainfall and periodic rainfall,according to the corresponding relationship between the permeability coefficient of unsaturated soil and the permeability coefficient of saturated soil,we use FLAC3D software to monitor the groundwater level in the process of rainfall infiltration,and use fish language to update the permeability coefficient of unsaturated soil in real time,and then determine the variation law of seepage field in the slope.The change of soil water content on the slope was monitored in the Pinglu Canal slope project in Guangxi,and the numerical simulation results were compared with the field test data to verify the reliability of the numerical simulation results.Through the numerical simulation analysis program proposed in this paper,the seepage characteristics of unsaturated soil on the slope under different rainfall modes are drawn,and the research results guide the slope engineering to formulate the support scheme in the process of rainfall.