CFG桩与粉喷桩加固软基的沉降对比分析  

COMPARISON OF SETTLEMENT CONTROL OF SOFT FOUNDATION BY CFG PILE AND DRY JET MIXING PILE

作　　者：周院芳 张鸿[2] 刘优平[2] 熊茂东 

机构地区：[1]江西公路开发总公司,南昌330038 [2]南昌工程学院土木与建筑工程学院,南昌330099

出　　处：《建筑技术》2011年第5期465-467,共3页Architecture Technology

基　　金：江西省科技计划项目(2010BGB01302);江西省交通运输厅重点科技项目(2010C00013;2010C00014)

摘　　要：通过有限差分软件FLAC3D建立高速公路软基段数值模型,分别改变CFG桩和粉喷桩的桩间距以及褥垫层厚度,探讨二者在控制路基沉降以及沉降速率方面的不同,结果表明CFG桩对于土体沉降的控制优于粉喷桩。CFG桩加固路基情况下土体沉降能够迅速趋于稳定,优于粉喷桩,在相同褥垫层厚度下,随着桩间距增大,地表最大沉降量也逐渐增大;随着褥垫层厚度增大,地表最大沉降量也逐渐增大,但当垫层厚度超过一定水平,土表面的沉降变化越来越小。The numerical calculation software FLAC3D is taken to build the numerical calculation model for the highway with soft foundation, the spacing and cushion thickness of CFG pile and dry jet mixing （DJM） pile are changed to study the settlement and settlement velocity control of soft foundation by two types of piles, the analysis results show that, in the area of settlement control, the CFG pile is better than DJM pile, as well as in the area of settlement velocity control, with the same cushion thickness, with increase of pile spacing, the settlement of the gt＇ound increases gradually; with increase of cushion thickness, the settlement of ground increases gradually too. But after the cushion thickness reaches some degree, the variation of the ground settle- ment becomes smaller.

关 键 词：CFG桩 粉喷桩 路基 数值模拟 

分 类 号：TU753[建筑科学—建筑技术科学]