组合型水泥粉煤灰碎石桩(CFG桩)复合地基在深厚软基处理中的应用  

Application of combined composite foundation with CFG pile in deep soft foundation treatment

作　　者：李继才[1,2] 曹军 丛建[1] LI Ji-cai;CAO Jun;CONG Jian(Nanjing Hydraulic Research Institute,Nanjing 210029,China;Nanjing R&D Tech Group Co.,Ltd.,Nanjing 210029,China)

机构地区：[1]南京水利科学研究院,江苏南京210029 [2]南京瑞迪建设科技有限公司,江苏南京210029

出　　处：《水运工程》2018年第11期156-161,198,共7页Port & Waterway Engineering

摘　　要：在深厚软土地基(fak≤100 kPa)上建造储罐等建筑物,承载力要求高、不均匀沉降变形要求严,若采用单一CFG桩复合地基加固,可能导致桩距过小或桩长太长,需要采用组合型复合地基,CFG桩+振冲碎石桩复合地基是组合型复合地基的一种。根据CFG桩+碎石桩组合型复合地基的加固机理,分析了其受力特性以及CFG桩和碎石桩的作用,研究表明CFG桩对提高地基承载力和减小沉降起控制作用。基于优化理论,建立了组合复合地基的优化设计方法。通过工程实例讨论了组合复合地基的优化设计方法,结果表明:复合地基的承载力、沉降量和经济效益均满足工程要求。The deep soft foundation(f ak≤100 kPa)of storage tanks and other buildings requires large bearing capacity and limited differential settlement deformation,the spacing of piles may be too little or the length may be too long if the single CFG pile is used in foundation treatment.Therefore,the combined composite foundations are needed,the combined composite foundation with the vibro-replacement stone columns is one of them.According to the strengthening mechanism of the combined composite foundation with the vibro-replacement stone columns and the CFG piles,the stress characteristics and the action of CFG pile and stone columns and CFG piles are analyzed.The results show that CFG pile can improve the foundation bearing capacity and reduce the settlement.Based on optimization theory,the optimization design method is established for the combined composite foundation.Finally,the optimization design method of the combined composite foundation is discussed by an engineering case,which shows that the bearing capacity,settlement and economical efficiency meet the engineering requirements.

关 键 词：组合型复合地基 CFG桩 软土地基 优化设计 

分 类 号：TU472[建筑科学—结构工程] U6[建筑科学—土工工程]