尾矿库渗流场计算的改进有限元法

Improved FEM for the Seepage Field Calculation of Tailings Dam

在传统的变动网格法基础上,提出了尾矿库渗流场的改进有限元分析方法。该方法与变动网格法的区别在于,具体计算时将整个坝体作为渗流区域,不需要首先假定自由液面,只需要假定逸出点的高程;网格划分可对整个坝体进行,只是在渗流逸出点附近要细化网格尺寸;在迭代过程中不用考虑渗流区域内的网格调整,只需对逸出点附近的网格进行局部修正。计算结束后得到的渗流场孔隙水压力为零的各点的连线即为浸润线。工程实例进一步验证了该方法的正确性。

An improved FEM for the seepage field calculation of tailings dam is proposed based on the traditional moving grid method. Its difference from the moving grid method lies in that, in specific calculation, the whole dam is considered as a seepage field, which requires only the assumption of the elevation of egress points instead of that of free liquid surface. The gridding may be made on the whole dam body, with only the refining for the area near the egress points required. In the interactive progress, only a local correction for the grids near the egress points is required, without considering the grid adjustment in the seepage zone. The link line of the points whose pore water pressure equals zero in the field that is got after the calculation is the seepage line. The correctness of the method is further verified by practical engineering cases.