深基坑支护开挖对临近地铁隧道结构的影响分析研究
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摘要
通过数值计算,采用考虑基坑开挖过程中土体剪切模量随应变增大而衰减特性的HSS模型,研究了基坑开挖卸荷作用下,邻近地铁隧道的埋深、隧道和基坑地连墙距离及刚度比等关键因素对地铁结构附加弯矩和附加位移的影响。结果表明:对于坑底隧道,在地下墙埋置深度范围内,与地连墙水平距离越大,隧道的侧移越小,在地下墙埋深以下,隧道侧移随与地连墙水平距离的增大而增大;通过比较坑侧与坑底隧道的附加弯矩与位移,得出地连墙底附近区域因基坑开挖卸荷引起的隧道附加弯矩较大,出现应力集中和明显的隧道-土-挡墙相互作用效应,坑侧隧道水平附加位移普遍大于竖向附加位移;此外,隧道与地连墙刚度比增大,对挡墙侧移和隧道附加位移都有明显的抑制作用。该研究揭示了基坑开挖作用下隧道-土-挡墙之间的相互作用规律,对深基坑开挖优化设计以及临近地铁结构的保护和安全运行具有一定的指导意义。
Extensive plane strain finite element analyses considering small strain effect were carried out to examine the tunnel responses induced by adjacent deep braced pit excavations in silty clay.The bending moments and displacements of the tunnel were studied by analyzing the influences of the key factors including the buried depth of the tunnel,the distance between the tunnel and the retaining wall and the tunnel stiffness ratio.The results indicate that,for tunnel beneath the pit,the lateral displacement of the tunnel decreases as the distance Ltincreasing when it is above the wall toe.However,the lateral displacement of tunnel increases as Ltincreasing when it is below the wall toe.It is obvious that the bending moments caused by excavation near the wall toe are significant,resulting in stress concentration and remarkable interaction effect between the tunnel,soil,and the retaining wall.Besides,the lateral displacement of the tunnel on the side of the pit is generally greater than the settlement.The lateral displacement of the retaining wall and the tunnel decreases as the tunnel stiffness ratio increasing.This study reveals the interaction of the tunnel-soil-retaining wall system subjected to braced pit excavation,providing guidance for the optimization design of the deep excavation and considering the safety of the adjacent tunnels.
Extensive plane strain finite element analyses considering small strain effect were carried out to examine the tunnel responses induced by adjacent deep braced pit excavations in silty clay.The bending moments and displacements of the tunnel were studied by analyzing the influences of the key factors including the buried depth of the tunnel,the distance between the tunnel and the retaining wall and the tunnel stiffness ratio.The results indicate that,for tunnel beneath the pit,the lateral displacement of the tunnel decreases as the distance Ltincreasing when it is above the wall toe.However,the lateral displacement of tunnel increases as Ltincreasing when it is below the wall toe.It is obvious that the bending moments caused by excavation near the wall toe are significant,resulting in stress concentration and remarkable interaction effect between the tunnel,soil,and the retaining wall.Besides,the lateral displacement of the tunnel on the side of the pit is generally greater than the settlement.The lateral displacement of the retaining wall and the tunnel decreases as the tunnel stiffness ratio increasing.This study reveals the interaction of the tunnel-soil-retaining wall system subjected to braced pit excavation,providing guidance for the optimization design of the deep excavation and considering the safety of the adjacent tunnels.
引文
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[2]魏少伟,张玉芳,郑刚.基坑开挖对坑底已建隧道影响的三维数值分析[J].土木建筑与环境工程,2013(增1):112-116.Wei Sh W,Zhang Y F,Zheng G.Three dimensional numerical investigation of the influence of basement excavation on underlying tunnels[J].Journal of Civil Architectural and Environmental Engineering,2013(Sup 1):112-116.(in Chinese)
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[4]郑刚,杜一鸣,刁钰,等.基坑开挖引起邻近既有隧道变形的影响区研究[J].岩土工程学报,2016,38(4):599-612.Zheng G,Du Y M,Diao Y,et al.Influenced zones for deformation of existing tunnels adjacent to excavations[J].Chinese Journal of Rock Mechanics and Engineering,2016,38(4):599-612.(in Chinese)
[5]况龙川.深基坑施工对地铁隧道的影响[J].岩土工程学报,2000,22(3):284-288.Kuang L Ch.Influence of construction of deep foundation pit on tunnels of metro[J].Chinese Journal of Geotechnical Engineering,2000,22(3):284-288.(in Chinese)
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[8]蒋洪胜,侯学渊.基坑开挖对临近软土地铁隧道的影响[J].工业建筑,2002,32(5):53-56.Jiang H Sh,Hou X Y.The influence of deep excavation on adjacent metro tunnel in soft ground[J].Industrial Construction, 2002, 32(5):53-56.(in Chinese)
[9] Hu Z F,Yue Z Q,Zhou J,et al.Design and construction of a deep excavation in soft soils adjacent to the Shanghai Metro tunnels[J].Canadian Geotechnical Journal,2003,40(5):933-948.
[10]王卫东,沈健,翁其平,等.基坑工程对邻近地铁隧道影响的分析与对策[J].岩土工程学报,2006,28(增1):1 340-1 345.Wang W D,Shen J,Weng Q P,et al.Analysis and countermeasures of influence of excavation on adjacent tunnels[J].Chinese Journal of Geotechnical Engineering,2006,28(Sup 1):1 340-1 345.(in Chinese)
[11]郑立常,卫建东,郑俊锋,等.基坑施工对临近运营地铁隧道影响监测的实践[J].测绘工程,2007,16(2):47-50.Zheng L Ch,Wei J D,Zheng J F,et al.The practice of deformation monitoring of metro tunnel influenced by the construction of adjacent foundation pit[J].Engineering of Surveying and Mapping,2007,16(2):47-50.(in Chinese)
[12]刘庭金.深基坑施工对地铁盾构隧道的影响分析[J].现代隧道技术,2008(增1):216-220.Liu T J.Analysis on influence of deep excavation on tunnels of metro[J].Modern Tunnelling Technology,2008(Sup 1):216-220.(in Chinese)
[13]高广运,高盟,杨成斌,等.基坑施工对运营地铁隧道的变形影响及控制研究[J].岩土工程学报,2010,32(3):453-459.Gao G Y,Gao M,Yang Ch B,et al.Influence of deep excavation on deformation of operating metro tunnels and countermeasures[J].Chinese Journal of Geotechnical Engineering,2010,32(3):453-459.(in Chinese)
[14]闫静雅.邻近运营地铁隧道的深基坑设计施工浅谈[J].岩土工程学报,2010,32(增1):234-237.Yan J Y.Design and construction of deep foundation pits near metro tunnels[J]. Chinese Journal of Geotechnical Engineering,2010,32(Sup 1):234-237.(in Chinese)
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[16]李进军,王卫东.紧邻地铁区间隧道深基坑工程的设计和实践[J].铁道工程学报,2011,158(11):104–111.Li J J,Wang W D.Design and construction of deep excavation engineering adjacent to the subway tunnel[J].Journal of Railway Engineering Society,2011,158(11):104-111.(in Chinese)
[17]邵华,王蓉.基坑开挖施工对邻近地铁影响的实测分析[J].地下空间与工程学报,2011(增1):1 403–1 408.Shao H,Wang R.Monitoring data analysis on influence of operating metro tunnel by nearly excavation construction[J].Chinese Journal of Underground Space and Engineering,2011(Sup 1):1 403-1 408.(in Chinese)
[18]肖同刚.基坑开挖施工监控对临近地铁隧道影响分析[J].地下空间与工程学报,2011,7(5):1 013–1 017.Xiao T G.Analysis on effect of deep-pit excavation and monitoring on neighboring metro tunnel in soft ground[J].Chinese Journal of Underground Space and Engineering,2011,7(5):1 013-1 017.(in Chinese)
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[20]袁静,刘兴旺,陈卫林.杭州粉砂土地基深基坑施工对邻近地铁隧道、车站的影响研究[J].岩土工程学报,2012,34(增1):398-403.Yuan J,Liu X W,Chen W L.Effect of construction of deep excavation in Hangzhou silty sand on adjacent metro tunnels and stations[J].Chinese Journal of Geotechnical Engineering,2012,34(Sup 1):398-403.(in Chinese)
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[22]姜兆华,张永兴.基坑开挖对邻近隧道纵向位移影响的计算方法[J].土木建筑与环境工程,2013,35(1):7-11.Jiang Zh H,Zhang Y X.Calculation of influence on longitudinal deformation of adjacent tunnels due to excavation[J].Journal of Civil,Architectural&Environmental Engineering,2013,35(1):7-11.(in Chinese)
[23]李宇升,喻卫华.深基坑施工对紧邻地铁区间隧道结构影响分析[J].地下空间与工程学报,2013,9(2):352-358.Li Y Sh,Yu W H.Analysis on influence of deep pit excavation on neighboring metro tunnel[J].Chinese Journal of Underground Space and Engineering,2013,9(2):352-358.(in Chinese)
[24]唐仁,林本海.基坑工程施工对邻近地铁盾构隧道的影响分析[J].地下空间与工程学报,2014(增1):1 629-1 634.Tang R,Lin B H.Analysis on the impact of the foundation pit construction on neighboring metro tunnel[J].Chinese Journal of Underground Space and Engineering,2014(Sup 1):1 629-1 634.(in Chinese)
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