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针对现有复合单元渗透矩阵调整法解决无压渗流问题的不足,提出了改进复合单元渗透矩阵调整法。将自由面单元分为干、湿单元以及过渡单元,对于自由面穿越的过渡单元,采用双参数罚函数法,按流量等效将渗流实区渗透系数进行调整,以便更准确地考虑单元的部分饱和和非饱和情况。该方法克服了高斯点附近积分值的不稳定问题,提高了计算精度和收敛速度。同时对有自由面渗流的自由面边界积分问题,提出了一种新的算法。经实例和工程验证,该方法有效可行。
In order to solve the problem of pressureless seepage flow of existing composite element osmotic matrix adjustment method, an improved composite element permeation matrix adjustment method is proposed. The free surface elements are divided into dry and wet elements and transition elements. For the transitional elements passing through the free surface, a two-parameter penalty function method is adopted to adjust the seepage coefficient of seepage realities according to the flow rate equivalent so as to more accurately consider the part of the element Saturated and non-saturated conditions. The method overcomes the problem of instability of integral value near Gaussian point, improves the calculation accuracy and convergence speed. At the same time, a new algorithm is proposed for the boundary integral of free surface with free surface seepage. The method is validated by examples and engineering verification.