CFG桩控制深厚层软土地基沉降的试验研究  

Experimental Study on the Settlement Control of High-speed Raiway Subgrade over Deep Soft Clay Reinforced by CFG Piles

作　　者：王炳龙[1] 杨龙才[1] 周顺华[1] 孙宏林[2] 

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海200331 [2]铁道第四勘察设计院,湖北武汉430063

出　　处：《铁道学报》2006年第6期112-116,共5页Journal of the China Railway Society

基　　金：铁道部科技发展计划项目(2002G01)

摘　　要：高速铁路对路基的工后沉降提出了严格的要求.据研究,路基在列车荷载作用下和路基本体在自重作用下产生的工后沉降是有限的,地基引起的工后沉降决定了路基工后沉降能否满足标准要求。因此正确选择能满足高速铁路技术标准要求的合理的软土地基处理方案和设计参数,是一项迫切需要解决的课题。本文根据某CFG(Cement Flyash Gravel)桩加固深厚层软土的试验成果,研究地基沉降规律、控制软土路基工后沉降的效果及CFG桩地基沉降的计算方法,结果表明:CFG桩是一种处理深厚层软土、有效控制路基工后沉降的方法;加固区沉降宜按复合模量法(Esp=ξEs,ξ为复合地基与天然地基承载力标准值之比;Es为天然地基压缩模量)计算,研究成果为CFG桩在高速铁路深厚层软土路基上的设计和应用提供了依据。The post-construction settlement of the high-speed railway subgrade is strictly limited. The sum of the fill compression and the plastic deformation provoked by running of trains is a very small proportion in post-construction settlement. The post-construction settlement generated by soft soil decides whether the post-construction settlement of subgrade over soft soil can meet relevant standards. Therefore, the ground treatment methods and design parameters have to be taken rationally to satisfy these requirements. Based on the in-situ test of subgrade over deep soft soil reinforced by CFG（Cement Flyash Gravel） piles, the soil settlement properties,effect of controlling post-construction settlement and settlement calculation method of ground are analysed. The results show using CFG piles is an effective reinforced method that can control post-construction settlement of subgrade. The settlement of the reinforced zone should be calculated by using the composite modulus calculation equation Esp =εE. （ε： the ratio of the composite foundation bearing capacity to the natural foundation bearing capacity;Es.the compression modulus of natural foundation）. This will provide a basis for the design of the high-speed railway subgrade over deep soft soil.

关 键 词：CFG桩 高速铁路 软土地基 路基工后沉降 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]