隧道盾构施工对邻近桩基群影响的数值分析
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摘要
通过建立有限元数值模型,对乌鲁木齐地铁一号线下穿乌准铁路桥的盾构施工过程进行模拟分析。并根据模拟结果,分析隧道开挖对桥梁桩基础的影响:隧道左、右线开挖后,由于受隧道开挖卸载影响,靠近隧道的桩基一侧发生沉降,最大沉降量为1.66mm。对比加固前后桩基位移,发现注浆加固后桩基沉降量减小,桩基状态更加稳定。
A finite element numerical model is established to run simulations and analyses on the shield construction process of Metro Line 1 passing through the Uzhun Railway Bridge in Urumqi. Based on the simulation results, the impacts of tunnel excavation on the bridge pile foundation are analyzed. After the excavation of the left and right lines of the tunnel, the pile foundation near the tunnel is settled due to the impact of tunnel excavation and unloading, and the maximum settlement is 1.66 mm. Comparing the displacement of the pile foundation before and after reinforcement, it's found that the pile foundation settlement after grouting reinforcement is reduced, and the pile foundation is in a more stable state.
A finite element numerical model is established to run simulations and analyses on the shield construction process of Metro Line 1 passing through the Uzhun Railway Bridge in Urumqi. Based on the simulation results, the impacts of tunnel excavation on the bridge pile foundation are analyzed. After the excavation of the left and right lines of the tunnel, the pile foundation near the tunnel is settled due to the impact of tunnel excavation and unloading, and the maximum settlement is 1.66 mm. Comparing the displacement of the pile foundation before and after reinforcement, it's found that the pile foundation settlement after grouting reinforcement is reduced, and the pile foundation is in a more stable state.
引文
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[9]Huang M,Zhang C,Li Z.A simplified analysis method for the influence of tunneling on grouped piles[J].Tunnelling and Underground Space Technology,2009,24(4):410-422.
[10]刘枫,年廷凯,杨庆,等.隧道开挖对邻近桩基工作性能的影响研究[J].岩土力学,2008,28(增):615-620.
[11]王丽,郑刚.盾构法开挖隧道对桩基础影响的有限元分析[J].岩土力学,2011,32(增1):704-711.
[12]朱逢斌,杨平.盾构隧道开挖对邻近桩基影响数值分析[J].岩土工程学报,2008,30(2):298-302.
[13]高伟,韩昌瑞,许英姿,等.浅埋暗挖隧道对桥梁基础的影响分析[J].公路,2012,11:123-128.
[14]李宁,王柱.地铁开挖对上部桩基变形的影响研究[J].土木工程学报,2006,10(1):5-7.
[15]芮勇勤,岳中琦,唐春安,等.隧道开挖方式对建筑物桩基影响的数值模拟分析[J].岩石力学与工程学报,2003,22(5):735-741.
[2]Chen L T,Poulos H G,Loganathan N.Pile responses caused by tunneling[J].Journal of Geotechnical and Geoenvironmental Engineering,1999,125(3):207-215.
[3]张宏博,黄茂松,王显春,等.浅埋隧道穿越建筑物桩基的三维有限元分析[J].同济大学学报:自然科学版,2006,34(12):1587-1591.
[4]Lee C J,Jacobsz S W.The influence of tunnelling on adjacent piled foundations[J].Tunnelling and underground space technology,2006,21(3-4).
[5]Mroueh H,Shahrour I.A full 3-D finite element analysis of tunneling–adjacent structures interaction[J].Computers and Geotechnics,2003,30(3):245-253.
[6]柳厚祥,方风华,李宁,等.地铁隧道施工诱发桩基变形的数值仿真分析[J].中南大学学报:自然科学版,2007,38(4):771-777.
[7]王占生,张顶立.浅埋暗挖隧道近距下穿既有地铁的关键技术[J].岩石力学与工程学报,2007,26(增2):4208-4214.
[8]杨晓杰,邓飞皇,聂雯,等.地铁隧道近距穿越施工对桩基承载力的影响研究[J].岩石力学与工程学报,2006,25(6):1290-1295.
[9]Huang M,Zhang C,Li Z.A simplified analysis method for the influence of tunneling on grouped piles[J].Tunnelling and Underground Space Technology,2009,24(4):410-422.
[10]刘枫,年廷凯,杨庆,等.隧道开挖对邻近桩基工作性能的影响研究[J].岩土力学,2008,28(增):615-620.
[11]王丽,郑刚.盾构法开挖隧道对桩基础影响的有限元分析[J].岩土力学,2011,32(增1):704-711.
[12]朱逢斌,杨平.盾构隧道开挖对邻近桩基影响数值分析[J].岩土工程学报,2008,30(2):298-302.
[13]高伟,韩昌瑞,许英姿,等.浅埋暗挖隧道对桥梁基础的影响分析[J].公路,2012,11:123-128.
[14]李宁,王柱.地铁开挖对上部桩基变形的影响研究[J].土木工程学报,2006,10(1):5-7.
[15]芮勇勤,岳中琦,唐春安,等.隧道开挖方式对建筑物桩基影响的数值模拟分析[J].岩石力学与工程学报,2003,22(5):735-741.