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CFG桩复合地基设计方法深入探讨
李国胜1,2
摘 要

(1 铜陵市建筑工程施工图设计文件审查有限公司, 铜陵 244000; 2 铜陵市建设工程质量监督监测有限公司, 铜陵 244000)

[摘要]对《建筑地基基础设计规范》(GB 50007—2011)、《建筑地基处理技术规范》(JGJ 79—2012)、《复合地基技术规范》(GB/T 50783—2012)中的CFG桩复合地基的规定进行比较,总结了CFG桩复合地基设计方法,并对CFG桩复合地基在超厚土层中和穿越不同土层时的设计方法及承载力低的下卧层验算方法进行了探讨。结论如下:在超厚土层中,CFG桩可以不穿透处理土层,但应进行桩端持力层的承载力验算;CFG桩穿越“上硬下软”土层时,可考虑上部硬土层的有利作用,节约造价;当在受力层范围内存在承载力低的下卧层时,应进行下卧层地基承载力验算。

[关键词]CFG桩; 复合地基; 下卧层; 承载力验算; 实体深基础; 沉降计算

中图分类号:TU473-1文献标识码:A文章编号:1002-848X(2019)14-0107-06

 

Further discussion on design method of CFG pile composite foundation

Li Guosheng1,2

(1 Tongling Architectural Engineering Construction Drawing Design Document Examination Co., Ltd., Tongling 244000, China;  2 Tongling Construction Project Quality Supervision and Monitoring Co., Ltd., Tongling 244000, China)

Abstract:By comparing the requirements of CFG pile composite foundation in Code for design of building foundation (GB 50007—2011), Technical code for ground treatment of buildings (JGJ 79—2012) and Technical code for composite foundation (GB/T 50783—2012), the design method of CFG pile composite foundation was summarized,  and the design method of CFG pile composite foundation in super-thick soil layer and when crossing through different soil layers as well as the method for checking calculation of underlying stratum with low bearing capacity were discussed. The conclusion are as following: CFG pile may not penetrate the treated soil layer in the super-thick soil layer, but the checking calculation of bearing capacity of the bearing stratum at the end of the pile should be conducted; when CFG pile passes through the “upper hard and lower soft” soil layer, consideration may be given to the advantageous role of the upper hard soil layer for the purpose of cost saving; when there is an underlying stratum  with low bearing capacity in the bearing stratum range, checking calculation of foundation bearing capacity of the underlying stratum should be conducted.

Keywords:CFG pile; composite foundation; underlying stratum; checking calculation of bearing capacity; deep massive foundation; settlement calculation

 

作者简介:李国胜,学士,高级工程师,一级注册结构工程师,Email: 693950802@qq.com。

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