Taking the civil air defense engineering as the example, the paper studies the load-sharing ratio of medium-column pile and un-excava- tion soil under that condition of mutual loading of the two in the construction with top-down method, carries out three-dimensional model establish- ment of typical engineering section with finite element software ANSYS. Thus, it not only simulates the engineering soil excavation process, but also effectively analyzes the soil pressure distribution and obtains the medium-column pile stress field, soil stress field and deformation field and other information, which has provided basis for the design and construction of top-down construction method.%以某人防工程为例，研究了盖挖逆作法施工中，中柱桩和土体共同承担上部荷载的情况下，中柱桩和未开挖土体荷载分担比的问题。采用通用有限元软件ANSYS对工程典型区间进行三维建模，不仅能模拟工程土体开挖过程，还能有效分析桩土压力的分配问题。能够获得中柱桩应力应变场、土体应力场、变形场等信息，为盖挖逆作法的设计、施工提供依据。
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