排水粉喷桩(2D工法)加固软土地基对桩周土体强度的影响

排水粉喷桩(简称2D工法)作为一种新的软土地基处理方法,在淮盐公路软基处理中得到试用,效果良好;但是目前对其桩间土强度的变化规律还不是很清楚,本文首次通过大量现场试验,采用静力触探、十字板剪切等试验手段,测得了排水粉喷桩施工后桩间土强度变化的规律。结果显示在排水粉喷桩施工后,桩间土强度先降低,之后随着龄期的增长而提高。

EFFECTS ON THE STRENGTH OF SOFT SOILS SURROUNDING PILES IN DRAIN AND DRY JET MIXING COLUMN METHODS

The drain and dry jet mixing column method is a new method for soft soil improvement.This method was used to treat the soft soil encountered in the Huaiyan highway.The results after the treatment show that this new method is effective.However,the change in properties of surrounding soils was not well understood.In this project,a number of field testing method including CPT and vane shear tests were used to evaluate the strength changes due to the installations of cement-mixed columns.The field test results have shown that the strength of the soft soils surrounding the piles reduced at the initial stage and then increased with the elapsed time.