盾构隧道邻域基坑施工下桩隔离效果研究
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摘要
为研究隔离桩在基坑开挖卸荷加载作用下对邻域既有地铁隧道的隔离保护效果,本文采用相似物理模型试验与数值模拟相结合的方法,分别对隔离桩的不同影响因素进行了研究。研究结果表明:在侧方中部基坑卸荷加载作用过程中,管片发生斜向基坑内侧的移动,同时结构发生逆时针方向的扭转现象;管片初始土压力呈"葫芦形"分布,当基坑卸荷完成和加载完成后,管片左下方和右上方土压力增大,右下方和左上方土压力略微减小。施加隔离桩后,管片位移和自身扭转现象明显减弱,土压力减小但变化规律保持不变。当隔离桩在影响区以下稳定土体内具有一定长度时,适当增大桩间距和桩顶埋入深度仍可取得较好的隔离效果。
In this paper,for the research of pile isolation effect of shield tunnel under the neighborhood foundation pit unloading-loading,several influencing factors of pile isolation are studied by using similar physical model test and numerical simulation. As shown in the conclusion,the segment moves toward the foundation pit and rotates itself during the foundation pit unloading-loading in the neighborhood. The distribution of segment initial earth pressure is shown as the gourd-shape,and the pressure of the lower part in the left and the upper part in the right increase while other part decrease when the excavation and reloading finish. While the earth pressure stays the same,the displacement and rotation of the segment are weakened significantly after piles are built. As long as the piles in the stable soil have a certain length,a good isolation effect can still be achieved after increasing the pile spacing and embedded depth appropriately.
In this paper,for the research of pile isolation effect of shield tunnel under the neighborhood foundation pit unloading-loading,several influencing factors of pile isolation are studied by using similar physical model test and numerical simulation. As shown in the conclusion,the segment moves toward the foundation pit and rotates itself during the foundation pit unloading-loading in the neighborhood. The distribution of segment initial earth pressure is shown as the gourd-shape,and the pressure of the lower part in the left and the upper part in the right increase while other part decrease when the excavation and reloading finish. While the earth pressure stays the same,the displacement and rotation of the segment are weakened significantly after piles are built. As long as the piles in the stable soil have a certain length,a good isolation effect can still be achieved after increasing the pile spacing and embedded depth appropriately.
引文
[1]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 Guangyun,Gao Meng,Yang Chengbin,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))
[2]姜兆华.基坑开挖时临近既有隧道的力学响应规律研究[D].重庆:重庆大学,2013.(Jiang Zhaohua.Study of mechanical response on adjacent tunnel in processes of foundation excavation[D]. Chongqing:Chongqing University,2013.(in Chinese))
[3]林杭,陈靖宇,郭春,等.基坑开挖对邻近既有隧道变形影响范围的数值分析[J].中南大学学报(自然科学版),2015,46(11):4240-4247.(Lin Hang,Chen Jingyu,Guo Chun,et al. Numerical analysis on influence of foundation pit excavation on deformation of adjacent existing tunnel[J]. Journal of Central South University(Science and Technology),2015,46(11):4240-4247.(in Chinese))
[4]姜峥.基坑开挖引起邻近管线变形的理论解析[J].地下空间与工程学报,2014,10(2):363-368.(Jiang Zheng. Theoretical analysis on deformation of pipeline caused by adjacent foundation pit excavation[J].Chinese Journal of Underground Space and Engineering,2014,10(2):363-368.(in Chinese))
[5]陈兴年,刘国彬,王忠远.关于软土基坑加固的一点看法[J].地下空间,2003,22(1):79-86.(Chen Xingnian, Liu Guobin, Wang Zhongyuan. Some opinions on reinforcement of soft soil foundation pit[J].Underground Space, 2003, 22(1):79-86.(in Chinese))
[6]王卫东,吴江斌,翁其平.基坑开挖卸载对地铁区间隧道影响的数值模拟[J].岩土力学,2004,25(增):251-255.(Wang Weidong,Wu Jiangbin,Weng Qiping.Numerical modeling of affection of foundation pit excavation on metro tunnel[J]. Rock and Soil Mechanics,2004,25(Supp.):251-255.(in Chinese))
[7]纪新博,赵文,李慎刚,等.隔离桩在隧道侧穿临近浅基础建筑中的应用[J].东北大学学报(自然科学版),2013,34(1):135-139.(Ji Xinbo,Zhao Wen,Li Shengang,et al. Application of isolation piles on metro tunnel for side-crossing the buildings with shallow foundation[J] Journal of Northeastern University(Natural Science), 2013, 34(1):135-139.(in Chinese))
[8]竺明星,王磊,龚维明.边载作用下隔离桩隔离效果的影响因素研究[J].岩土工程学报,2014,36(4):671-679.(Zhu Mingxing,Wang Lei,Gong Weiming.Factors influencing isolation effects of isolation piles under side loading[J]. Chinese Journal of Geotechnical Engineering,2014,36(4):671-679.(in Chinese))
[9]郑刚,杜一鸣,刁钰.隔离桩对基坑外既有隧道变形控制的优化分析[J].岩石力学与工程学报,2015,34(增1):3499-3509.(Zheng Gang,Du Yiming,Diao Yu. Optimization analysis of efficiency of isolation piles in controlling the deformation of existing tunnels adjacent to deep excavation[J]. Chinese Journal of Rock Mechanics and Engineering,2015,34(Supp.1):3499-3509.(in Chinese))
[10]吴权.深基坑工程树根桩隔离作用实例分析[J].建筑技术,2007,38(3):199-202.(Wu Quan. Case analysis of isolation function of root pile in deep foundation pit[J]. Architecture Technology,2007,38(3):199-202.(in Chinese))
[11]项彦勇,贺少辉,张弥,等.导洞隔离桩墙结构对浅埋暗挖隧道周边地层移动的限制作用[J].岩石力学与工程学报,2004,23(19):3317-3323.(Xiang Yanyong,He Shaohui, Zhang Mi, et al. Constraint effect of pilot-drift and separation-pile structure on ground movements induced by shallow tunneling[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(10):3317-3323.(in Chinese))
[12]周健,王浩,蔡宏英,等.软土卸载孔压特性的试验与理论计算分析[J].岩土工程学报,2002,24(5):556-559.(Zhou Jian,Wang Hao,Cai Hongying,et al.Pore pressure characteristic analysis of soft clay during unloading based on lab data and numerical calculation[J]. Chinese Journal of Geotechnical Engineering,2002,24(5):556-559.(in Chinese))
[13] Tarek A, Ricado D, Thomas F, et al. Centrifuge research of countermeasures to protect pile foundations against liquefaction-induced lateral spreading[J].Journal of Earthquake Engineering,2005,9(Supp.1):105-125
[14]魏少伟.基坑开挖对坑底已建隧道影响的数值与离心试验研究[D].天津:天津大学,2010.(Wei Shaowei. Centrifuge and numerical studies of the influence of basement excavation on the underlying tunnel[D]. Tianjin:Tianjin University, 2010.(in Chinese))
[2]姜兆华.基坑开挖时临近既有隧道的力学响应规律研究[D].重庆:重庆大学,2013.(Jiang Zhaohua.Study of mechanical response on adjacent tunnel in processes of foundation excavation[D]. Chongqing:Chongqing University,2013.(in Chinese))
[3]林杭,陈靖宇,郭春,等.基坑开挖对邻近既有隧道变形影响范围的数值分析[J].中南大学学报(自然科学版),2015,46(11):4240-4247.(Lin Hang,Chen Jingyu,Guo Chun,et al. Numerical analysis on influence of foundation pit excavation on deformation of adjacent existing tunnel[J]. Journal of Central South University(Science and Technology),2015,46(11):4240-4247.(in Chinese))
[4]姜峥.基坑开挖引起邻近管线变形的理论解析[J].地下空间与工程学报,2014,10(2):363-368.(Jiang Zheng. Theoretical analysis on deformation of pipeline caused by adjacent foundation pit excavation[J].Chinese Journal of Underground Space and Engineering,2014,10(2):363-368.(in Chinese))
[5]陈兴年,刘国彬,王忠远.关于软土基坑加固的一点看法[J].地下空间,2003,22(1):79-86.(Chen Xingnian, Liu Guobin, Wang Zhongyuan. Some opinions on reinforcement of soft soil foundation pit[J].Underground Space, 2003, 22(1):79-86.(in Chinese))
[6]王卫东,吴江斌,翁其平.基坑开挖卸载对地铁区间隧道影响的数值模拟[J].岩土力学,2004,25(增):251-255.(Wang Weidong,Wu Jiangbin,Weng Qiping.Numerical modeling of affection of foundation pit excavation on metro tunnel[J]. Rock and Soil Mechanics,2004,25(Supp.):251-255.(in Chinese))
[7]纪新博,赵文,李慎刚,等.隔离桩在隧道侧穿临近浅基础建筑中的应用[J].东北大学学报(自然科学版),2013,34(1):135-139.(Ji Xinbo,Zhao Wen,Li Shengang,et al. Application of isolation piles on metro tunnel for side-crossing the buildings with shallow foundation[J] Journal of Northeastern University(Natural Science), 2013, 34(1):135-139.(in Chinese))
[8]竺明星,王磊,龚维明.边载作用下隔离桩隔离效果的影响因素研究[J].岩土工程学报,2014,36(4):671-679.(Zhu Mingxing,Wang Lei,Gong Weiming.Factors influencing isolation effects of isolation piles under side loading[J]. Chinese Journal of Geotechnical Engineering,2014,36(4):671-679.(in Chinese))
[9]郑刚,杜一鸣,刁钰.隔离桩对基坑外既有隧道变形控制的优化分析[J].岩石力学与工程学报,2015,34(增1):3499-3509.(Zheng Gang,Du Yiming,Diao Yu. Optimization analysis of efficiency of isolation piles in controlling the deformation of existing tunnels adjacent to deep excavation[J]. Chinese Journal of Rock Mechanics and Engineering,2015,34(Supp.1):3499-3509.(in Chinese))
[10]吴权.深基坑工程树根桩隔离作用实例分析[J].建筑技术,2007,38(3):199-202.(Wu Quan. Case analysis of isolation function of root pile in deep foundation pit[J]. Architecture Technology,2007,38(3):199-202.(in Chinese))
[11]项彦勇,贺少辉,张弥,等.导洞隔离桩墙结构对浅埋暗挖隧道周边地层移动的限制作用[J].岩石力学与工程学报,2004,23(19):3317-3323.(Xiang Yanyong,He Shaohui, Zhang Mi, et al. Constraint effect of pilot-drift and separation-pile structure on ground movements induced by shallow tunneling[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(10):3317-3323.(in Chinese))
[12]周健,王浩,蔡宏英,等.软土卸载孔压特性的试验与理论计算分析[J].岩土工程学报,2002,24(5):556-559.(Zhou Jian,Wang Hao,Cai Hongying,et al.Pore pressure characteristic analysis of soft clay during unloading based on lab data and numerical calculation[J]. Chinese Journal of Geotechnical Engineering,2002,24(5):556-559.(in Chinese))
[13] Tarek A, Ricado D, Thomas F, et al. Centrifuge research of countermeasures to protect pile foundations against liquefaction-induced lateral spreading[J].Journal of Earthquake Engineering,2005,9(Supp.1):105-125
[14]魏少伟.基坑开挖对坑底已建隧道影响的数值与离心试验研究[D].天津:天津大学,2010.(Wei Shaowei. Centrifuge and numerical studies of the influence of basement excavation on the underlying tunnel[D]. Tianjin:Tianjin University, 2010.(in Chinese))
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