CFG桩复合地基加固高速公路深厚软基若干问题研究

Study on Some Problems Existing in CFG Pile Composite Ground Treating Deep Soil Foundation in Express Way Construction

摘要:

对CFG桩复合地基加固高速公路深厚软基的若干问题进行了研究。考虑CFG桩沉管效应利用圆孔扩张理论，在规范和经验设计方法的基础上分别建立了按工后沉降控制和考虑成桩效应的复合地基桩间距设计计算新方法。同时对CFG桩沉管效应进行了计算分析，考虑成桩扰动推导了桩间土体模量的计算公式。

Abstract:

The paper studies some problems existing in CFG pile composite ground treating deep soft foundation in express way construction. Two new methods to design and calculate composite ground pile distance are put forward according to post-construction settlement and effect of driving pile in CFG pile composite ground by use of the theory of cavity expansion base on criterion and experience. The effect of driving pile in CFG pile composite ground is calculated and analyzed. The paper has carried on mathematics to derive to the soil around the pile modular according to effort balance analysis and taking into account compaction effect. The radius of compaction zone is derived based on the theory of cavity expansion.