基于ANSYS的某湖堤渗流场模拟分析研究

Study on Simulation Analysis of Seepage Field of Lake Dyke Based on ANSYS

以某湖堤为工程对象,利用ANSYS有限元数值分析平台,分析该湖堤渗流场模拟结果。研究表明,堤坝稳定渗流场中存在吸力水头,集中在坝顶面,最大吸力水头达4.625 m,坝身孔隙水压力水头平均值为7.8 m,坝基处孔隙水头压力最大,达9.6 m。降雨强度影响初始流量边界条件,降雨强度增大,吸力水头增大,渗流场活跃度增大。未有降雨时,降雨入渗与非入渗两种工况模拟结果一致,当降雨量增大,离差值增大,且离差值表现总滞后于降雨期,降雨影响持续时长达57.4 h,后趋于收敛平静。以下降期水位为初始边界条件的模拟结果相对误差更小,长历时变化更稳定,仅有54%波动,渗流模拟结果更快收敛。以期为利用数值模拟分析软件研究堤坝渗流场提供一定的参考依据。

Taking a lake dike as an engineering object,using the ANSYS finite element numerical analysis platform to analyze the simulation results of the lake dike seepage field,it is obtained that there is a suction head in the stable seepage field of the dike,concentrated on the top surface of the dam,and the maximum suction head is 4.625 m,the average pore water pressure head of the dam body is 7.8 m,and the pore head pressure at the base of the dam is the largest,reaching 9.6 m.The rainfall intensity affects the initial flow boundary conditions.The rainfall intensity increases,the suction head increases,and the seepage field activity increases.When there is no rainfall,the simulation results of rainfall infiltration and non-infiltration conditions are consistent.When the rainfall increases,the dispersion value increases,and the performance of the dispersion value always lags the rainfall period.And then tend to converge and calm.The relative error of the simulation results using the water level in the descent period as the initial boundary conditions is smaller,the long-term variation is more stable,only 54% fluctuates,and the seepage simulation results converge faster.The thesis has a certain reference basis for using numerical simulation analysis software to study the seepage field of dams.