基坑开挖与下卧盾构隧道掘进相互影响分析
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摘要
盾构隧道掘进对上部基坑支护体系安全性会产生不利影响,而上部基坑主体结构施作又会影响下卧隧道的变形特性。为保证施工安全,以实际工程为背景,针对基坑开挖与下卧盾构隧道掘进相互影响进行了研究,主要包括:1)采用有限元软件分析了盾构下穿及侧穿基坑时对基坑支护结构及底板的影响,发现盾构下穿基坑时对基坑底板变形的影响较大,而侧穿基坑时则对基坑围护结构影响较大;2)研究了基坑上部主体结构施作对下卧盾构隧道的影响,结果表明由于主体结构荷载由自身工程桩承担,区间隧道位移满足规范要求;3)基坑与下卧隧道重叠施工时,应选择合理的施工时序,保证基坑开挖与下卧隧道的安全。研究结果可为类似工程提供有利参考。
Shielded tunnel excavation adjacent to the foundation deep excavation might induce the adverse effect to the safety of excavation supporting structures;on the other hand,the foundation and supper structure construction might also affect the deformation of the excavated tunnel.To maintain the safety of the tunnel excavation,the effect of deep excavation on the underlying shielded tunnel was evaluated.These study aspects include:1)the effect of shielded tunnel excavation on bottom of the foundation excavation area as well as the supporting structures was analyzed by using finite element method.The results indicate that,if the shielded tunnel excavation is directly underneath the deep excavation,the deformation at the bottom of the deep excavation will be greatly affected;whereas,if the shielded tunnel is excavated beside the foundation excavation,the supporting structure of the deep excavation will then be influenced.2)The influence building structure on the shielded tunnel construction was also investigated and it was concluded that the weight of the superstructure is carried by the pile foundation and the impact on the tunnel excavation is minimal.3)When the deep excavation and the shielded tunnel is vertically aligned,proper construction sequence is needed to ensure the safe excavation of both the tunnel and the excavation.
Shielded tunnel excavation adjacent to the foundation deep excavation might induce the adverse effect to the safety of excavation supporting structures;on the other hand,the foundation and supper structure construction might also affect the deformation of the excavated tunnel.To maintain the safety of the tunnel excavation,the effect of deep excavation on the underlying shielded tunnel was evaluated.These study aspects include:1)the effect of shielded tunnel excavation on bottom of the foundation excavation area as well as the supporting structures was analyzed by using finite element method.The results indicate that,if the shielded tunnel excavation is directly underneath the deep excavation,the deformation at the bottom of the deep excavation will be greatly affected;whereas,if the shielded tunnel is excavated beside the foundation excavation,the supporting structure of the deep excavation will then be influenced.2)The influence building structure on the shielded tunnel construction was also investigated and it was concluded that the weight of the superstructure is carried by the pile foundation and the impact on the tunnel excavation is minimal.3)When the deep excavation and the shielded tunnel is vertically aligned,proper construction sequence is needed to ensure the safe excavation of both the tunnel and the excavation.
引文
[1]何连昇,何春茂,张俊.基坑开挖对下卧盾构隧道的影响风险分析[J].沈阳建筑大学学报(自然科学版),2015,31(1):62-70.
[2]龙宏德,刘俊景,王定军,等.地铁隧道上方长距离并行基坑开挖的施工影响及变形控制[J].城市轨道交通研究,2018(1):106-112.
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[8]丁加亮,陈江,余富先,等.深圳地铁11号线车公庙综合交通枢纽工程两相邻基坑开挖对下卧运营隧道的影响[J].隧道建设,2015(9):867-872.
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[10]高强,于文龙.市政隧道基坑开挖对既有下卧地铁盾构隧道影响分析[J].隧道建设,2014(4):311-317.
[11]薛彦琪,张可能,胡晓军.深基坑开挖卸荷对下卧既有地铁隧道的影响分析[J].工程地质学报,2016(6):1230-1239.
[12]王定军,王婉婷,段罗,等.基坑开挖对下卧地铁隧道的施工影响分析[J].地下空间与工程学报,2017(S1):223-232.
[13]周泽林,陈寿根,陈亮,等.基坑施工对下卧地铁隧道上抬变形影响的简化理论分析[J].岩土工程学报,2015(12):2224-2234.
[14]徐长节,王伊丽,徐芫蕾,等.新建工程基坑开挖及结构施工对既建下卧隧道的影响研究[J].岩土力学,2015(11):3201-3209.
[15]姚燕明,杨金刚,王哲.分析基坑开挖对其下卧隧道、管线变形的影响[J].地下空间与工程学报,2013(S2):2029-2033.
[16]蔡建鹏,刘国宝.基坑施工对下卧地铁盾构隧道影响的数值分析[J].地下空间与工程学报,2013(S2):1877-1881.
[2]龙宏德,刘俊景,王定军,等.地铁隧道上方长距离并行基坑开挖的施工影响及变形控制[J].城市轨道交通研究,2018(1):106-112.
[3]郭鹏飞,杨龙才,周顺华,等.基坑开挖引起下卧隧道隆起变形的实测数据分析[J].岩土力学,2016,S2:613-621.
[4]宗翔.基坑开挖卸载引起下卧已建隧道的纵向变形研究[J].岩土力学,2016(S2):571-577.
[5]杨世东,唐艳丽,刘庆方,等.基坑开挖施工对超近距离下卧既有盾构隧道的保护技术研究[J].隧道建设,2017(A02):35-46.
[6]杜磊,王育平,明德志.基坑卸荷开挖对下卧地铁隧道影响的数值分析[J].山东科技大学学报(自然科学版),2016(6):62-67.
[7]岳会婷,赵传亮,孙佳羽.明挖隧道对平行下卧盾构区间竖向影响探讨[J].佳木斯大学学报(自然科学版),2017(5):727-730.
[8]丁加亮,陈江,余富先,等.深圳地铁11号线车公庙综合交通枢纽工程两相邻基坑开挖对下卧运营隧道的影响[J].隧道建设,2015(9):867-872.
[9]赵俊,甘鹏路,申文明,等.复合地层中基坑开挖对下卧隧道变形影响研究[J].隧道建设,2014(2):118-123.
[10]高强,于文龙.市政隧道基坑开挖对既有下卧地铁盾构隧道影响分析[J].隧道建设,2014(4):311-317.
[11]薛彦琪,张可能,胡晓军.深基坑开挖卸荷对下卧既有地铁隧道的影响分析[J].工程地质学报,2016(6):1230-1239.
[12]王定军,王婉婷,段罗,等.基坑开挖对下卧地铁隧道的施工影响分析[J].地下空间与工程学报,2017(S1):223-232.
[13]周泽林,陈寿根,陈亮,等.基坑施工对下卧地铁隧道上抬变形影响的简化理论分析[J].岩土工程学报,2015(12):2224-2234.
[14]徐长节,王伊丽,徐芫蕾,等.新建工程基坑开挖及结构施工对既建下卧隧道的影响研究[J].岩土力学,2015(11):3201-3209.
[15]姚燕明,杨金刚,王哲.分析基坑开挖对其下卧隧道、管线变形的影响[J].地下空间与工程学报,2013(S2):2029-2033.
[16]蔡建鹏,刘国宝.基坑施工对下卧地铁盾构隧道影响的数值分析[J].地下空间与工程学报,2013(S2):1877-1881.