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为了能用平面应变有限元来分析砂井地基，本文首先推导出了砂墙地基（砂井地基在平面应变条件下的表现形式）双向渗流等应变固结理论解，然后将此解与巴隆轴对称固结理论解相比较，得到砂井地基平面应变情况和轴对称情况之间的等效公式．此公式即考虑了地基水平变形，也考虑了砂井的涂抹作用．这种等效方法能方便、准确地用于砂井地基的平面应变有限元分析之中．
In order to be able to analyze the sand-well foundation by using the plane strain finite element method, this paper firstly derives the solution of strain consolidation theory such as bidirectional seepage of sand-wall foundation (the manifestation of sand-foundation under plane strain condition) Axisymmetric consolidation theory solution compared to get the sand plane foundation plane strain and axial symmetry between the equivalent formula. This formula takes into account the level of deformation of the foundation, also considered the sand well smear effect. This equivalent method can be used conveniently and accurately in the plane strain finite element analysis of sand foundation.