桩基施工对邻近既有地铁隧道影响的数值分析
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摘要
采用数值分析方法,建立桩-隧相互作用的三维有限元模型,通过改变桩-隧相对位置、隧道埋深、水平净距、桩基半径和考虑群桩因素,研究静压桩基施工对软土地区既有地铁隧道的影响。研究结果表明:桩基侧面施工引起的隧道变形较大,且随着桩身与隧道水平净距增大,变形在传递过程中不断衰减;浅埋隧道受扰动影响较为敏感,产生变形较大;桩基半径增大也会加剧隧道结构的变形;桩基邻近既有地铁隧道施工的影响区可划分为强影响区、一般影响区和弱影响区;群桩中的已存在桩对挤土效应具有阻挡效应。
The method of numerical analysis was used to establish three-dimensional finite element model of pile-tunnel interaction, and the influence of static pressure pile foundation construction on existing metro tunnel in soft soil was studied by changing the relative position of the pile-tunnel, the tunnel depth, the horizontal distance, the pile radius, and considering the group piling effect. The results show that tunnel deformation caused by the side of pile foundation construction is large. With the increase of net distance between pile and tunnel, the tunnel deformation is continuously attenuated in the process of transmission, and the degree of influence is gradually weakened. The shallow tunnel is sensitive to disturbance and presents huge deformation. The increase of pile radius will also aggravate deformation of the tunnel structure. It is proposed that the influence of pile construction adjacent to the existing metro tunnels is divided into strong influence areas, general influence areas and weak influence areas. It has been verified that the existing piles in the pile group have a blocking effect on the squeezing soil effect.
The method of numerical analysis was used to establish three-dimensional finite element model of pile-tunnel interaction, and the influence of static pressure pile foundation construction on existing metro tunnel in soft soil was studied by changing the relative position of the pile-tunnel, the tunnel depth, the horizontal distance, the pile radius, and considering the group piling effect. The results show that tunnel deformation caused by the side of pile foundation construction is large. With the increase of net distance between pile and tunnel, the tunnel deformation is continuously attenuated in the process of transmission, and the degree of influence is gradually weakened. The shallow tunnel is sensitive to disturbance and presents huge deformation. The increase of pile radius will also aggravate deformation of the tunnel structure. It is proposed that the influence of pile construction adjacent to the existing metro tunnels is divided into strong influence areas, general influence areas and weak influence areas. It has been verified that the existing piles in the pile group have a blocking effect on the squeezing soil effect.
引文
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[16]闫静雅,张子新,黄宏伟,等.桩基础荷载对邻近已有隧道影响的有限元分析[J].岩土力学,2008,29(9):2508-2514.YAN Jingya,ZHANG Zixin,HUANG Hongwei,et al.Finite element analysis of influence of pile group loading on existing neighboring tunnels[J].Rock and Soil Mechanics,2008,29(9):2508-2514.
[17]杨敏,靳军伟.桩基础与既有地铁隧道相互影响的研究进展[J].建筑结构学报,2016,37(8):90-100.YANG Min,JIN Junwei.Research progress on interaction of pile foundation with nearby existing subway tunnel[J].Journal of Building Structures,2016,37(8):90-100.
[18]张吉坤,寇海磊,刘新胜,等.桩基施工振动对周围环境的影响及防治[J].价值工程,2010,29(7):87-88.ZHANG Jikun,KOU Hailei,LIU Xinsheng,et al.Influence and prevention of the pile foundation construction vibration to the surrounding environment[J].Value Engineering,2010,29(7):87-88.
[2]YOO C.Three dimensional numerical investigation on the effect of bridge construction on existing tunnel[J].Journal of the Korean Society of Civil Engineering,2014,18(3):794-802.
[3]闫静雅.桩基础全寿命期对邻近已有隧道的影响研究[D].上海:同济大学土木工程学院,2007:3-23.YAN Jingya.The influence of pile foundation in life-cycle on adjacent existing tunnel[D].Shanghai:Tongji University.College of Civil Engineering,2007:3-23.
[4]MEASOR E O,NEW D H.The design and construction of the Royal Festival Hall,South Bank(Includes Photographs)[J].Journal of the Institution of Civil Engineers,1951,36(7):241-305.
[5]吕宝伟.超临界桥桩基施工对既有隧道影响数值与实测分析[J].铁道标准设计,2017,61(3):103-107.LüBaowei.Monitoring and numerical analysis of the impact of supercritical bridge pile foundation on existing tunnel[J].Railway Standard Design,2017,61(3):103-107.
[6]冯龙飞,杨小平,刘庭金.跨线桥桩基施工对临近隧道影响的有限元分析[J].铁道建筑,2014(1):37-39.FENG Longfei,YANG Xiaoping,LIU Tingjin.Finite element analysis of the effect of cross-bridge pile foundation construction on adjacent tunnels[J].Railway Engineering,2014(1):37-39.
[7]路平,郑刚.立交桥桩基础施工及运营期对既有隧道影响的研究[J].岩土工程学报,2013,35(增刊2):923-927.LU Ping,ZHENG Gang.Influence of construction and operation of pile foundation of overpass on existing tunnels[J].Chinese Journal of Geotechnical Engineering,2013,35(Suppl.2):923-927.
[8]秦世伟,周艳坤,莫泷.静压桩沉桩施工对临近隧道的影响[J].上海大学学报(自然科学版),2013,19(5):527-533.QIN Shiwei,ZHOU Yankun,MO Long.Influences of driving pile on neighboring tunnel[J].Journal of Shanghai University(Natural Science),2013,19(5):527-533.
[9]张戈.软土地区桩基施工对紧邻运营地铁隧道的位移控制[J]都市快轨交通,2016,29(6):93-98.ZHANG Ge.Displacement control of pile foundation construction in soft soil area adjacent to running metro tunnel[J].Urban Rapid Rail Transit,2016,29(6):93-98.
[10]丁智,王永安,虞兴福,等.近距离桥桩施工对地铁隧道影响监测分析[J].现代隧道技术,2016,53(1):173-179.DING Zhi,WANG Yongan,YU Xingfu,et al.Monitoring and analysis of the impact of adjacent bridge pile construction on subway tunnels[J].Modern Tunnelling Technology,2016,53(1):173-179.
[11]王卫东,王浩然,徐中华.基坑开挖数值分析中土体硬化模型参数的试验研究[J].岩土力学,2012,33(8):2283-2290.WANG Weidong,WANG Haoran,XU Zhonghua.Experimental study of parameters of hardening soil model for numerical analysis of excavations of foundation pits[J].Rock and Soil Mechanics,2012,33(8):2283-2290.
[12]黄赞.静压桩终压力的确定及其意义[J].建筑技术,2002,33(3):184-186.HUANG Zan.Determination and meaning of final pressure in static pressure pile[J].Architecture Technology,2002,33(3):184-186.
[13]李杰.静压桩的摩阻力和侧压力试验研究[D].郑州:河南工业大学土木建筑学院,2006:24-32.LI Jie.Study of shear stress and earth pressure on jacked pile[D].Zhengzhou:Henan University of Technology.College of Civil Engineering and Architecture,2006:24-32.
[14]陈军,杜守继,沈水龙,等.静压桩挤土对既有隧道的影响及施工措施研究[J].土木工程学报,2011,44(增刊2):81-84.CHEN Jun,DU Shouji,SHEN Shuilong,et al.Study of effect of jacked piles on tunnel and construction measures[J].China Civil Engineering Journal,2011,44(Suppl 2):81-84.
[15]蒋辉,路平.ALE法分析挤土桩对既有隧道变形的影响[J].低温建筑技术,2013,35(3):94-96.JIANG Hui,LU Ping.Analysis of the effect of soil squeezing pile on the deformation of existing tunnel by ALE method[J].Low Temperature Building Technology,2013,35(3):94-96.
[16]闫静雅,张子新,黄宏伟,等.桩基础荷载对邻近已有隧道影响的有限元分析[J].岩土力学,2008,29(9):2508-2514.YAN Jingya,ZHANG Zixin,HUANG Hongwei,et al.Finite element analysis of influence of pile group loading on existing neighboring tunnels[J].Rock and Soil Mechanics,2008,29(9):2508-2514.
[17]杨敏,靳军伟.桩基础与既有地铁隧道相互影响的研究进展[J].建筑结构学报,2016,37(8):90-100.YANG Min,JIN Junwei.Research progress on interaction of pile foundation with nearby existing subway tunnel[J].Journal of Building Structures,2016,37(8):90-100.
[18]张吉坤,寇海磊,刘新胜,等.桩基施工振动对周围环境的影响及防治[J].价值工程,2010,29(7):87-88.ZHANG Jikun,KOU Hailei,LIU Xinsheng,et al.Influence and prevention of the pile foundation construction vibration to the surrounding environment[J].Value Engineering,2010,29(7):87-88.