邻近高速铁路单根高压旋喷桩施工对周围土体的变形影响  

Deformation Impact of Construction of a Single High-pressure Jet Grouting Pile in the Vicinity of a High-speed Railway on Surrounding Soil Mass

作　　者：罗军 王炳龙 陕耀[2,3] 张博 王宇[1] LUO Jun;WANG Binglong;SHAN Yao;ZHANG Bo;WANG Yu(East China Survey and Design Co.,Ltd.of CREEC,Hangzhou 310000,China;Shanghai Key Laboratory of Rail Transit Structure Durability and System Safety,Shanghai 201804,China;MOE Key Laboratory of Road and Traffic Engineering,Tongji University,Shanghai 201804,China)

机构地区：[1]中铁二院华东勘察设计有限责任公司,杭州310000 [2]上海市轨道交通结构耐久与系统安全重点实验室,上海201804 [3]同济大学道路与交通工程教育部重点实验室,上海201804

出　　处：《高速铁路技术》2023年第1期13-19,共7页High Speed Railway Technology

基　　金：国家自然科学基金(51778485)。

摘　　要：为研究邻近既有高速铁路高压旋喷桩施工引起的周围土体变形规律,本文以实际地基加固工程为背景,采用现场试验与有限元模拟相结合的方法,明确了单根高压旋喷桩的施工影响距离,分析了高压旋喷桩的施工参数对周围土体变形的影响,提出了邻近高速铁路的高压旋喷桩施工注意事项。研究结果表明:现场试验的单根桩施工影响距离约占桩长的80%,有限元模拟的影响距离占桩长的78.9%,旋喷桩周围土体的最大水平位移及单根桩的影响距离将随着钻杆提升速度减小及注浆压力增大而增大,当邻近高速铁路进行高压旋喷桩施工时,应确定适宜的施工参数,加强对既有高速铁路的变形监测,必要时在施工前采取一定的变形控制措施。The purpose of the paper is to study the deformation law of surrounding soil mass caused by the construction of high-pressure jet grouting piles in the vicinity of existing high-speed railways.Based on a practice case of foundation reinforcement,the results of field test and finite element simulation were combined to recognize the impacted distance of the construction of a single high-pressure jet grouting pile.On this basis,the effect of construction parameters of high-pressure jet grouting piles on the deformation of surrounding soil mass was analyzed,and the precautions were put forward for the construction of high-pressure jet grouting piles in the vicinity of an existing high-speed railway.The results show that:The impacted distance of single pile construction in the field test accounts for about 80% of the pile length,and the impacted distance of finite element simulation accounts for 78.9% of the pile length.The maximum horizontal displacement of the soil mass around the jet grouting pile and the impacted distance of a single pile will increase with the decrease in the lifting speed of the drill pipe and the increase in the grouting pressure.When the highpressure jet grouting pile construction is carried out in the vicinity of a high-speed railway,appropriate construction parameters shall be determined,deformation monitoring of existing high-speed railways shall be strengthened,and certain deformation control measures shall be taken before construction if necessary.

关 键 词：高压旋喷桩 水平位移 现场试验 数值模拟 

分 类 号：U416.1[交通运输工程—道路与铁道工程]