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一、前言关于多孔体中具有自由水面的非恒定渗流问题,以往多用电比拟法、粘性流体比拟法等模型实验,或用有限差分的数值解析法进行研究。近年来随着以水发电为目的的填石坝的建设,由水位变化这类易于考虑的边界条件及多孔体非均质材料特性影响的有限单元数值解析法已占主导地位。近来虽然不需要按非恒定变动的自由水面进行单元节点的移动及重新分割等繁杂的计
I. INTRODUCTION With regard to the unsteady seepage problem with free surface water in porous bodies, the model experiments such as the multi-electricity ratio method and the viscous fluid ratio method in the past, or the numerical analysis by finite difference method, In recent years, with the construction of rockfill dam with the purpose of generating water power, the finite element numerical analysis method that is easily influenced by water level changes and the heterogeneous material properties of porous bodies has dominated. Recently, there is no need to perform complicated calculations such as moving and re-dividing cell nodes by a non-constant free surface