水泥土搅拌桩复合地基承载力折减系数α和β的试验研究  

EXPERIMENTAL STUDY OF REDUCTION COEFFICIENTS α AND β OF CEMENT-SOIL PILES COMPOSITE FOUNDATION

作　　者：林奕禧 张伟丽[2,3] 黄良机 蔡健[3] 

机构地区：[1]珠海市建设工程质量监督检测站,广东珠海519015 [2]中国地质大学,湖北武汉430074 [3]华南理工大学,广东广州510641

出　　处：《岩石力学与工程学报》2009年第A02期3815-3820,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(50878087);珠海市科技基金资助项目(PA200310064)

摘　　要：《建筑地基处理技术规范》分别给出含有折减系数α的单桩承载力计算公式和含有系数β的复合地基承载力计算公式,为了得到适用于本地区的α和β的取值范围,为今后规范的修订提供参考数据,对珠三角地区有代表性的淤泥质土地基采用水泥土搅拌桩进行加固处理,进行单桩、天然地基以及设置4种厚度褥垫层的水泥土搅拌桩四桩复合地基的静载荷试验。通过对试验数据的分析和反算,对规范给出的承载力计算公式中折减系数α和β的取值范围进行修正,给出详细的取值建议。同时分析褥垫层厚度对复合地基承载力的影响,并建议褥垫层厚度取200～400mm,为珠三角地区水泥土搅拌桩复合地基的设计提供参考。The calculational formula for bearing capacity of single pile with coefficient α and bearing capacity of composite foundation with coefficient β are shown in Technical Code for Construction Foundation Treatment.In order to get the value scopes of α and β which are suitable for this region and provide revision data for future code revision,the reinforcement treatment of representative silt soil foundation is carried out by means of cement-soil mixing pile in the Pearl River Delta area.And then,the load test is performed on single pile,natural foundation and four cement-soil mixing piles composite foundation,which is set with four kinds of thickness cushions.Based on analysis and calculation of the test data,the value ranges of the reduction coefficient α and β in the bearing capacity formula in the code are modified.Finally,the influence of cushion thickness on the bearing capacity of composite foundation is analyzed.It is suggested that the value range of cushion thickness is 200-400 mm,which can provide reference for design of cement-soil mixing pile composite foundation in the Pearl River Delta area.

关 键 词：桩基工程 水泥土搅拌桩 复合地基 承载力 褥垫层 载荷试验 折减系数 

分 类 号：TU473[建筑科学—结构工程]