CFG桩在饱和粉土施工中出现的主要问题分析与对策——以郑东新区为例  

Analysis on Main Problems Occurring in Construction of CFG Piles in Saturated Silt and the Countermeasures——Taking Zhengdong New District as An Example

作　　者：赵秀绍[1] 姚爱国[1] 孙瑞民[1] 汤凤林[1] 

机构地区：[1]中国地质大学工程学院(武汉),武汉430074

出　　处：《工程勘察》2006年第4期38-42,共5页Geotechnical Investigation & Surveying

基　　金：河南省科技攻关项目(0524450008)

摘　　要：CFG(Cement Fly-ash Gravel)桩复合地基是近十几年来发展起来的新型桩复合地基。由于郑东新区特殊的工程地质条件,常常引起窜孔及周围建筑物开裂等施工事故,这严重制约了CFG桩复合地基在郑东新区的应用。在深入实地考察的基础上,对造成郑东新区CFG桩施工主要问题的原因进行了探讨,得出触变、抽吸、振动剪切液化、渗流作用是引起施工问题的主要原因。The composite foundation with CFG piles is one of new soil treatment techniques used in recent years. Because of the special engineering geological conditions in Zhengdong New District, the problems such as the fleeing bore and the cracking of surrounding building often occur, which restrict the application of CFG piles in the district. The causes for the problems are discussed through the field investigation. The thixotropy, pumping, dynamic shear liquefaction and seepage are the main reasons.

关 键 词：CFG桩 窜孔 液化 郑东新区 

分 类 号：TU473.1[建筑科学—结构工程]