桩基施工对近邻地铁隧道的影响分析  

Analysis of Effects on Metro Tunnel Due to Adjacent Pile Foundation Construction

作　　者：谢小山[1] 陈彦恒[1] 赵春彦[2] XIE Xiaoshan;CHEN Yanheng;ZHAO Chunyan(Zhengzhou Railway Vocational ＆ Technical College, Zhengzhou, He＇ nan 451460, China;School of Civil Engineering, Central South University, Changsha, Hu＇ nan 410075, China)

机构地区：[1]郑州铁路职业技术学院,河南郑州451460 [2]中南大学土木工程学院,湖南长沙410075

出　　处：《施工技术》2018年第13期32-35,41,共5页Construction Technology

基　　金：国家自然科学基金项目(51408613)

摘　　要：结合南大路立交桥匝道桩基施工,采用现场监测和数值模拟手段,分析了桩基施工过程中深层水平位移、地表沉降以及近邻隧道结构变形的变化。结果表明:桩基施工对周边土体产生挤压,地表发生隆起,而后隆起量降低并趋于稳定;桩基邻近匝道路基边坡施工,开挖卸载引起土体应力释放,地表产生较大隆起变形,约占最大变形量的50%;桩基施工将对隧道结构产生一定的影响:距隧道结构越近,其影响越大;桩基成孔及灌注对近邻隧道结构影响最大。Combining with pile foundation construction of South Road overpass ramp,using numerical simulation and field monitoring means,this paper analyzed the law of the surface subsidence,horizontal displacement of the deep soils and structure of tunnel displacement. The results show that in the process of the pile foundation construction,the surrounding soil was squeezed and the surface uplift occurred,then the amount of uplift decreased and stabilized. During pile foundation construction neighboring ramp embankment slope,the soil was excavated and its stress was released,then large surface uplift occurred and the heave value may account for the 50% of the maximum settlement. The pile foundation construction can affect the adjacent tunnel structure： the closer between the tunnel and the piles,the larger the influence,the pile hole construction has greater influence on tunnel structure.

关 键 词：桩基 隧道 位移 沉降 监测 数值模拟 

分 类 号：TU753.3[建筑科学—建筑技术科学]