软土盾构隧道近接施工应力迁移规律研究
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摘要
在多线叠交隧道空间布置形式下,盾构近距离穿越既有隧道施工对既有隧道的影响主要通过扰动周边的土体,使其应力发生改变,进而影响既有隧道的应力状态。针对外力作用下衬砌和土体两种不同介质进行耦合作用时应力的快速迁移现象,构建了考虑土体流变特性的盾构近接施工应力迁移模型,推导出新建隧道以任一穿越角度施工时,既有隧道和扰动土体在时间域内的应力迁移解析式,并讨论了取值参数的敏感性程度。分析结果可为今后类似多线叠交隧道工程的设计和施工提供理论指导。
Under the spatial distribution for multi-line overlapped tunnels,the effect of shield construction disturbance on the existing tunnels when they are traversed by the new tunnel is studied. The stress of both existing tunnels and soil will be changed quickly. In view of the phenomenon for stress migration patterns caused by the coupling between lining and soil,the construction stress migration model considering the rheological properties of soil when shield nearly meets is established. Analytic expression for stress migration patterns between tunnel and soil in time domain are calculated during the construction of shield crossing within any angle. What's more,the degree of the sensitivity of the parameter values is analyzed. The research results can provide some theoretical basis and prophase guidance for similar projects in the future.
Under the spatial distribution for multi-line overlapped tunnels,the effect of shield construction disturbance on the existing tunnels when they are traversed by the new tunnel is studied. The stress of both existing tunnels and soil will be changed quickly. In view of the phenomenon for stress migration patterns caused by the coupling between lining and soil,the construction stress migration model considering the rheological properties of soil when shield nearly meets is established. Analytic expression for stress migration patterns between tunnel and soil in time domain are calculated during the construction of shield crossing within any angle. What's more,the degree of the sensitivity of the parameter values is analyzed. The research results can provide some theoretical basis and prophase guidance for similar projects in the future.
引文
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[10]陶炜,洪汉净,刘培洵.板内应力快速积累的一种机制[J].地震地质,2002,24(3),368-376.(Tao Wei,Hong Hanjing,Liu Peixun.An explanation of the rapid accumulation of stress in continental plates[J].Seismology and Geology,2002,24(3),368-376.(in Chinese))
[11]张国民,李丽.地壳介质的流变性与孕震模型[J].地质地震,2003,25(1):1-9.(Zhang Guomin,Li Li.Rheology of crustal media and a related seismogenic model[J].Seismology and Geology,2003,25(1):1-9.(in Chinese))
[2]于宁,朱合华.盾构隧道施工地表变形分析与三维有限元模拟[J].岩土力学,2002,25(8):1 330-1 334.(Yu Ning,Zhu Hehua.Analysis of earth deformation caused by shield tunnel construction and 3DFEM simulation[J].Rock and Soil Mechanics,2002,25(8):1 330-1 334.(in Chinese))
[3]孙钧,刘洪洲.交叠隧道盾构法施工土体变形的三维数值模拟[J].同济大学学报(自然科学版),2002,30(4):379-385.(Sun Jun,Liu Hongzhou.3-D numerical simulation of ground surface settlement under overlapped shield tunneling[J].Journal of Tongji University(Natural Science),2002,30(4):379-385.(in Chinese))
[4]孙钧,袁金荣.盾构施工扰动与地层移动及智能神经网络预测[J].岩土工程学报,2001,23(3):261-267.(Sun Jun,Yuan Jinrong.Soil disturbance and ground movement under shield tunneling and intelligent prediction by using ANN technology[J].Chinese Journal of Geotechnical Engineering,2001,23(3):261-267.(in Chinese))
[5]张云,殷宗泽,徐永福.盾构法隧道引起的地表变形分析[J].岩石力学与工程学报,2002,28(3):388-392.(Zhang Yun,Yin Zongze,Xu Yongfu.Analysis on three-dimensional ground surface deformations due to shield tunnel[J].Chinese Journal of Rock Mechanics and Engineering,2002,28(3):388-392.(in Chinese))
[6]Chapman D N,Ahn S K,Hunt D V L.Investigating ground movements caused by the construction of multiple tunnels in soft ground using laboratory model tests[J].Canadian Geotechnical Journal,2007,44(6):631-643.
[7]F Addenbrooke T I,Potts D M.Twin tunnel interaction:surface and subsurface effects[J].International Journal of Geomechanics,2001,1(2):249-271.
[8]刘干斌,谢康和,施祖元.粘弹性饱和土中深埋圆形隧道衬砌-土相互作用[J].工程力学,2005,22(6):148-154.(Liu Ganbin,Xie Kanghe,Shi Zuyuan.Soil-structure interaction of a deep circular tunnel in visco-elastic saturated soil[J].Engineering Mechanics,2005,22(6):148-154.(in Chinese))
[9]徐永福,陈建山,傅德明.盾构掘进对周围土体力学性质的影响[J].岩石力学与工程学报,2003,22(7):1 174-1 179.(Xu Yongfu,Chen Jianshan,Fu Deming.Effect of shield tunneling on mechanical properties of soils[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(7):1 174-1 179.(in Chinese))
[10]陶炜,洪汉净,刘培洵.板内应力快速积累的一种机制[J].地震地质,2002,24(3),368-376.(Tao Wei,Hong Hanjing,Liu Peixun.An explanation of the rapid accumulation of stress in continental plates[J].Seismology and Geology,2002,24(3),368-376.(in Chinese))
[11]张国民,李丽.地壳介质的流变性与孕震模型[J].地质地震,2003,25(1):1-9.(Zhang Guomin,Li Li.Rheology of crustal media and a related seismogenic model[J].Seismology and Geology,2003,25(1):1-9.(in Chinese))
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