中文摘要：

在实测资料和理论分析的基础上，对强夯置换法加固松软土地基的若干问题进行研究。这些问题包括地基土性的适用性问题、强夯置换的施工步骤和填料要求、孔隙水压力的演化过程和影响范围、强夯置换对周围土层的挤压效应所引起的侧向位移和深层位移的变化。分析随夯击次数的增加，置换桩体的形成过程。此外，还对强夯置换后复合地基的承载力等问题进行研究。

英文摘要：

Based on field tests and theoretical analyses, some problems on the dynamic replacement method（DRM） to improve saturated soft soil ground are discussed. These problems include the validity of soils for the DRM, the construction processes and the demands of filling, the evolution of pore water pressure and affecting scopes. Besides, the lateral displacements and deep settlements of soil layers induced by the squeezing effects due to dynamic replacement are also discussed. The formation processes of block stone column and its mechanism with the number of dynamic loading increasing are analyzed. Finally, the variation of bearing capacity of the soft soil foundation improved by DRM is investigated.