穿越河堤的城市轨道交通盾构施工安全监测技术
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摘要
城市轨道交通穿越的河堤为1级堤防,由于盾构施工将不可避免地扰动土体,破坏原有的平衡状态,而向新的平衡状态转化,引起地面变形、地层变化以及水体介质运移分布情况变化可能危及地面堤防建筑物及其附属设施的安全。实测横向沉降观测断面,累计沉降量从隧道轴向位置向两侧逐渐减小,受盾构机掘进施工影响,隧道轴线两侧20m范围内的堤基土体均受到相当程度的扰动,堤基土体深层水平位移最大值发生在隧道轴线高程附近,盾构推进的同时进行同步注浆和二次注浆加固地层,并可根据监测情况采用地面跟踪注浆。
The embankment through which urban rail transit passes is a level 1 embankment. Due to the shield construction,it will inevitably disturb the soil,destroy the original equilibrium state,and transform into a new equilibrium state. Causes ground deformation,formation changes and changes in the distribution of water medium migration may endanger the safety of ground embankment buildings and their ancillary facilities. The measured horizontal settlement observation section,the accumulated settlement gradually decreases from the axial position of the tunnel to both sides,and is affected by the construction of the shield machine excavation. The dike soil within 20 m on both sides of the tunnel axis is disturbed to a considerable extent. The maximum horizontal displacement of the dike soil body occurs near the height of the tunnel axis. At the same time,the shield is propelled by synchronous grouting and secondary grouting to reinforce the strata. Ground tracking grouting can be used according to the monitoring situation.
The embankment through which urban rail transit passes is a level 1 embankment. Due to the shield construction,it will inevitably disturb the soil,destroy the original equilibrium state,and transform into a new equilibrium state. Causes ground deformation,formation changes and changes in the distribution of water medium migration may endanger the safety of ground embankment buildings and their ancillary facilities. The measured horizontal settlement observation section,the accumulated settlement gradually decreases from the axial position of the tunnel to both sides,and is affected by the construction of the shield machine excavation. The dike soil within 20 m on both sides of the tunnel axis is disturbed to a considerable extent. The maximum horizontal displacement of the dike soil body occurs near the height of the tunnel axis. At the same time,the shield is propelled by synchronous grouting and secondary grouting to reinforce the strata. Ground tracking grouting can be used according to the monitoring situation.
引文
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[2] Xiongyao Xie,Yubing Yang,Mei Ji. Analysis of Ground Surface Settlement Induced by the Construction of a Large-diameter Shield-driven Tunnel in Shanghai,China[J]. Tunnelling and Underground Space Technology,2016(51):120~132.
[3] Chen,S.L.,Gui,M.W.,Yang,M.C. Applicability of the Principle of Superposition in Estimating Ground Surface Settlement of Twin-and Quadruple-tube Tunnels[J]. Tunnelling and Underground Space Technology,2012(28):135~149.
[4]吴世明,林存刚,张忠苗等.泥水盾构下穿堤防的风险分析及控制研究[J].岩石力学与工程学报,2011,30(5):1034~1042.
[5]吴为义,孙宇坤,李良等.过江隧道大直径盾构下穿引起的大堤变形分析[J].中国铁道科学,2016,37(4):78~82.
[6] Sirivachiraporn,A.,Phienwej,N. Ground Movements in EPB Shield Tunneling of Bangkok Subway Project and Impacts on Adjacent Buildings[J]. Tunnelling and Underground Space Technology,2012(30):10~24.
[7]施瑾伟,王学军.盾构法施工在过江隧道中的风险及应对措施[J].重庆交通大学学报·自然科学版,2013,32(1):23~26.
[8]张忠苗,林存刚,吴世明等.过江盾构隧道穿越大堤的地层沉降分析及控制[J].岩土工程学报,2011,33(6):977~984.