CFG桩在高挡土墙地基加固中的应用  

Application of CFG Pile in Ground Improvement of High Retaining Wall

作　　者：刘毅[1] 蔡佳愿 LIU Yi;CAI Jiayuan(CCCC-FHDI Engineering Co.,Ltd.,Guangzhou Guangdong 510230,China)

机构地区：[1]中交第四航务工程勘察设计院有限公司

出　　处：《工程质量》2019年第11期19-22,26,共5页Construction Quality

摘　　要：挡土墙在边坡治理中运用广泛,在高挡土墙设计中,往往会遇到挡土墙地基承载力不足的问题。若挡土墙高度较高,基底压力较大,且存在较大水平荷载,常规的天然地基和换填垫层法均难以满足地基承载力的要求,需要研究新型、合理的地基加固方法。主要研究CFG桩复合地基在高挡土墙工程中应用的可行性,并结合现有的挡土墙工程实例,对挡土墙地基承载力进行了计算分析,并采用有限元软件Plaxis 3D进行数值模拟研究。结果表明,CFG桩复合地基能提高地基承载力和整体稳定性,并能满足水平荷载的验算。因此,采用CFG桩对高挡土墙进行地基加固的方法是可行的,具有一定的经济性和实用性。Retaining walls are widely used in slope protection,in the design of high retaining walls;the problem of insufficient bearing capacity is often encountered.If the height of the retaining wall is high,the pressure of foundation and horizontal load are high,it is difficult to meet the requirements of bearing capacity by the natural foundation or replacement cushion method,and it is necessary to study a new and reasonable foundation reinforcement method.In this paper,the feasibility of CFG pile composite foundation in high retaining wall project is studied.Combined with the engineering example,the bearing capacity of retaining wall foundation is calculated and analyzed,and the finite element software Plaxis 3D is used to perform the numerical simulation study.The results show that the CFG pile composite foundation can effectively improve the bearing capacity and the overall stability.In addition,it also meets the checking calculation of horizontal loads.Therefore,the method of using CFG piles to improve the foundation of high retaining wall is feasible,and it also has certain economy and practicability.

关 键 词：CFG桩 挡土墙 复合地基 有限元分析 

分 类 号：TU447[建筑科学—岩土工程] TU753.8[建筑科学—土工工程]