软土地层大直径泥水盾构掘进引起的地面变形分析
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摘要
为了研究大直径泥水平衡盾构施工引起的地层变形,基于Mindlin解,推导了在泥浆重度影响下开挖面不均匀附加压力、不均匀分布下盾壳摩擦力、环向消散下盾尾注浆压力引起的地层变形,叠加地层损失引起的地层变形,获得了大直径泥水平衡盾构施工引起地层变形的计算公式,典型工程实例结果表明:①不考虑泥浆重度、不均匀分布和环向消散等因素会高估地面纵向位移的隆起值而低估沉降值,本文计算方法所得地面纵向位移与实测值吻合较好;②本文方法计算所得的大直径泥水平衡盾构施工引起的地面横向位移与实测变形基本吻合,且符合高斯曲线正态分布。研究成果可为控制和预测大直径盾构隧道施工引起的地层位移提供理论指导。
To study the ground settlement caused by large-diameter slurry shield during tunnel construction in soft soils, the formulas are proposed on the basis of the Mindlin solutions. The effects of unit weight of slurry on the additional pressure around cutting head, the effects of shield gravity on the non-uniform distribution of softening skin frictions along the shield, the dissipation of grouting pressure along the lining rings and the ground deformation caused by volume loss ratio are considered in the proposed solutions. The calculated and field results are compared through a typical engineering case. The results show that:(1) Without considering the unit weight of slurry, non-uniform distribution and circumferential dissipation, the heave of ground longitudinal displacement is overestimated, and the settlement value is underestimated. The calculated results of longitudinal deformation by the proposed method are in good agreement with the measured results.(2) The calculated results of transverse deformation by the proposed method are in good agreement with the measured results. The transverse deformation of ground surface induced by large-diameter slurry shield is close to normal distribution. The results can provide scientific reference for the prediction and control of ground deformation induced by large-diameter slurry shield.
To study the ground settlement caused by large-diameter slurry shield during tunnel construction in soft soils, the formulas are proposed on the basis of the Mindlin solutions. The effects of unit weight of slurry on the additional pressure around cutting head, the effects of shield gravity on the non-uniform distribution of softening skin frictions along the shield, the dissipation of grouting pressure along the lining rings and the ground deformation caused by volume loss ratio are considered in the proposed solutions. The calculated and field results are compared through a typical engineering case. The results show that:(1) Without considering the unit weight of slurry, non-uniform distribution and circumferential dissipation, the heave of ground longitudinal displacement is overestimated, and the settlement value is underestimated. The calculated results of longitudinal deformation by the proposed method are in good agreement with the measured results.(2) The calculated results of transverse deformation by the proposed method are in good agreement with the measured results. The transverse deformation of ground surface induced by large-diameter slurry shield is close to normal distribution. The results can provide scientific reference for the prediction and control of ground deformation induced by large-diameter slurry shield.
引文
[1]魏纲,张世民,齐静静,等.盾构隧道施工引起的地面变形计算方法研究[J].岩石力学与工程学报,2006,25(增刊1):3318-3323.(WEI Gang,ZHANG Shi-ming,QIJing-jing,et al.Study on calculation method of ground deformation induced by shield tunnel construction[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(S1):3318-3323.(in Chinese))
[2]LIN C G,ZHANG Z M,WU S M,et al.Key techniques and important issues for slurry shield under-passing embankments:a case study of Hangzhou qiantang river tunnel[J].Tunnelling and Underground Space Technology,2013,38(9):306-325.
[3]梁荣柱,夏唐代,林存刚,等.盾构推进引起地表变形及深层土体水平位移分析[J].岩石力学与工程学报,2015,34(3):583-593.(LIANG Rong-zhu,XIA Tang-dai,LINCun-gang,et al.Analysis of ground surface displacement and horizontal movement of deep soils induced by shield advancing[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(3):583-593.(in Chinese))
[4]徐明,邹文浩,刘瑶.超大直径泥水盾构在砂土中的开挖面稳定性分析[J].土木工程学报,2012,45(3):174-181.(XU Ming,ZOU Wen-hao,LIU Yao.Face stability of large slurry shield-driven tunnel in sands[J].China Civil Engineering Journal,2012,45(3):174-181.(in Chinese))
[5]MINDLIN R D.Force at a point in the interior of a semi-infinite solid[J].Journal of Applied Physics,1936,7(5):195-202.
[6]LI Y,EMERIAULT F,KASTNER R,et al.Stability analysis of large slurry shield-driven tunnel in soft clay[J].Tunnelling and Underground Space Technology,2009,24(4):472-481.
[7]ZHOU S,LI X,JI C,et al.Back-fill grout experimental test for discharged soils reuse of the large diameter size slurry shield tunnel[J].KSCE Journal of Civil Engineering,2017,21(3):1-9.
[8]苟长飞,叶飞,张金龙,等.盾构隧道同步注浆充填压力环向分布模型[J].岩土工程学报,2013,35(3):590-598.(GOU Chang-fei,YE Fei,ZHANG Jin-long,et al.Ring distribution model of filling pressure for shield tunnels under synchronous grouting[J].Chinese Journal of Geotechnical Engineering,2013,35(3):590-598.(in Chinese))
[9]阮文军.基于浆液黏度时变性的岩体裂隙注浆扩散模型[J].岩石力学与工程学报,2005,24(15):2709-2714.(RUANWen-jun.Spreading model of grouting in rock mass fissures based on time-dependent behavior of viscosity of cement-based grouts[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(15):2709-2714.(in Chinese))
[2]LIN C G,ZHANG Z M,WU S M,et al.Key techniques and important issues for slurry shield under-passing embankments:a case study of Hangzhou qiantang river tunnel[J].Tunnelling and Underground Space Technology,2013,38(9):306-325.
[3]梁荣柱,夏唐代,林存刚,等.盾构推进引起地表变形及深层土体水平位移分析[J].岩石力学与工程学报,2015,34(3):583-593.(LIANG Rong-zhu,XIA Tang-dai,LINCun-gang,et al.Analysis of ground surface displacement and horizontal movement of deep soils induced by shield advancing[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(3):583-593.(in Chinese))
[4]徐明,邹文浩,刘瑶.超大直径泥水盾构在砂土中的开挖面稳定性分析[J].土木工程学报,2012,45(3):174-181.(XU Ming,ZOU Wen-hao,LIU Yao.Face stability of large slurry shield-driven tunnel in sands[J].China Civil Engineering Journal,2012,45(3):174-181.(in Chinese))
[5]MINDLIN R D.Force at a point in the interior of a semi-infinite solid[J].Journal of Applied Physics,1936,7(5):195-202.
[6]LI Y,EMERIAULT F,KASTNER R,et al.Stability analysis of large slurry shield-driven tunnel in soft clay[J].Tunnelling and Underground Space Technology,2009,24(4):472-481.
[7]ZHOU S,LI X,JI C,et al.Back-fill grout experimental test for discharged soils reuse of the large diameter size slurry shield tunnel[J].KSCE Journal of Civil Engineering,2017,21(3):1-9.
[8]苟长飞,叶飞,张金龙,等.盾构隧道同步注浆充填压力环向分布模型[J].岩土工程学报,2013,35(3):590-598.(GOU Chang-fei,YE Fei,ZHANG Jin-long,et al.Ring distribution model of filling pressure for shield tunnels under synchronous grouting[J].Chinese Journal of Geotechnical Engineering,2013,35(3):590-598.(in Chinese))
[9]阮文军.基于浆液黏度时变性的岩体裂隙注浆扩散模型[J].岩石力学与工程学报,2005,24(15):2709-2714.(RUANWen-jun.Spreading model of grouting in rock mass fissures based on time-dependent behavior of viscosity of cement-based grouts[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(15):2709-2714.(in Chinese))