无压渗流有限元分析的改进初流量法  

Modified initial flow method for FEM analysis of unconfined seepage

作　　者：李新强[1] 

机构地区：[1]中国水利水电科学研究院岩土工程研究所,北京100044

出　　处：《水利学报》2007年第8期961-965,共5页Journal of Hydraulic Engineering

基　　金：国家自然科学基金重点项目(50539100);国家自然科学基金项目(50509027)

摘　　要：目前常用的裂隙岩体渗流等效连续介质模型中在初流量域的积分误差是由于积分中选择高斯点作为初流量判定依据和积分值所致。因此本文引入连续调整系数法对利用初流量法求解自由面的计算精度问题进行了改进,并利用矩形均质坝渗流的实例对改进模型计算精度和收敛性进行了验证。实例表明,经改进的初流量法稳定性和收敛性良好。The low accuracy and bad convergence problem of initial flow method for calculating the free surface in FEM analysis of unconfined seepage is cause by the integral error of initial flow domain owing to the discontinuity in numerical integral and using the Gauss point as the reference point. A new concept named Stepless Control Coefficient （SCC） is introduced to establish a modified method to solve this problem. The validity of this method is verified by the calculation result of an example with homogeneous material in square shape.

关 键 词：岩土力学 渗流 有限元法 初流量法 

分 类 号：TU43[建筑科学—岩土工程]