关键词: 搅拌桩, 复合地基, 非等应变, 沉降

Abstract: Taking into account the displacement non-compatibility between the deep mixing columns and the surrounding soils, a new method is developed for calculating the total settlement of ground improved by deep mixing column method. Based on previous test results, a simplified column-soil stress ratio and differential settlement between column and surrounding soil calculation model was proposed. Column lateral friction and loading sharing ratio between columns and soils were calculated based on the actual stress state; and then the settlements of column and surrounding soil were calculated respectively. The new method satisfied force equilibrium and displacement compatibility of the system components, including the embankment, column, and foundation soil between and under columns. In order to verify the correctness of the proposed model, the measured settlement in Huai-Yan expressway, the settlements calculated by the proposed method and traditional composite modulus method were compared. Results indicate that the settlement calculated by the proposed method is in good agreement with the measured result; and the proposed method precedes the traditional composite modulus method.