高灵敏土中CFG桩复合地基剪切液化问题探讨

Discussion about shear liquefaction on cement flay-ash gravel pile composite foundation in high sensitive soil

应用长螺旋钻管内泵压CFG桩施工工艺处理高灵敏度土时,常常造成桩周饱和土层剪切液化,引发串孔、缩径、断桩、地面沉降等不良工程事故。通过对郑州地区高灵敏度土的动力特性试验,分析了剪切液化诱发上述问题的作用机理,探讨了剪切液化的影响范围及其防治措施。

Fleeing problem, reducing diameter, breaking pile and land subsidence, ete often happen during the application of twist boring concrete pumping piling technique in high sensitive soil. Based on dynamic property tests on high sensitive soil in Zhenzhou area, the mechanism of these problems caused by shear liquefaction is analyzed theoretically, and the range of the shear liquefaction, as well as some measures to prevent shear liquefaction, are discussed.