大断面矩形顶管隧道施工围岩变形与力学特性
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摘要
针对城市繁华地段大断面矩形顶管隧道施工引起围岩扰动与破坏问题,依托郑州市红专路大断面矩形顶管隧道实际工程,采用FLAC~(3D)有限差分法数值计算,建立三维数值模型,进行了大断面近距离多个平行矩形顶管隧道施工围岩变形与力学特性的研究。研究表明:大断面近距离多个平行矩形顶管引起的地面沉降与沉降槽宽度,后期顶管施工影响明显大于先期施工;在顶管隧道顶进过程,靠近始发井围岩沿隧道轴线方向围岩土体切应力较大,远离始发井切应力较小;考虑了盾构机的掌子面推力与盾壳,管节顶进过程的泥皮套摩阻力,同步注浆压力,提出一种综合考虑盾构机、管节顶进以及同步注浆的三维数值模拟方法。
Focusing on the surrounding rock disturbance and damage caused by the construction of large-section rectangular pipe jacking tunnel in this particular area, a large section rectangular pipe jacking tunnel located in Hongzhuan road, Zhengzhou, was taken as an example. The FLAC~(3 D) finite difference method was used to calculate the surrounding rock deformation and mechanical performance of large-section parallel rectangular pipe jacking tunnels within a close range. Results indicate that: the maximum ground settlement and the settlement tank width caused by the soil loss of the post-construction pipe jack are greater than those of the pre-constructed pipe jacking tunnels; during the jacking process of the tunnel, the surrounding rock near the starting shaft has a large shear stress along the axis of the tunnel, and the shear stress is lower for those far from the starting well; considering the thrust of the face of the shield machine, the mud-sleeve friction resistance of the jacking process of both pipe joint and shield shell, and the simultaneous grouting pressure, a 3 D numerical simulation method was proposed which considers the shield tunneling machine, pipe jacking and simultaneous grouting.
Focusing on the surrounding rock disturbance and damage caused by the construction of large-section rectangular pipe jacking tunnel in this particular area, a large section rectangular pipe jacking tunnel located in Hongzhuan road, Zhengzhou, was taken as an example. The FLAC~(3 D) finite difference method was used to calculate the surrounding rock deformation and mechanical performance of large-section parallel rectangular pipe jacking tunnels within a close range. Results indicate that: the maximum ground settlement and the settlement tank width caused by the soil loss of the post-construction pipe jack are greater than those of the pre-constructed pipe jacking tunnels; during the jacking process of the tunnel, the surrounding rock near the starting shaft has a large shear stress along the axis of the tunnel, and the shear stress is lower for those far from the starting well; considering the thrust of the face of the shield machine, the mud-sleeve friction resistance of the jacking process of both pipe joint and shield shell, and the simultaneous grouting pressure, a 3 D numerical simulation method was proposed which considers the shield tunneling machine, pipe jacking and simultaneous grouting.
引文
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[11] 唐晓武,朱季,刘维,等.盾构施工过程中的土体变形研究[J].岩石力学与工程报,2010,29(2):417-422.
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[13] 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(S1):3317-3323.
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[15] 赵丽雅,许宏发,晋学辉,等.盾构隧道下穿铁路群的路基加固及沉降分析[J].水利与建筑工程学报,2017,15(4):85-90.
[2] 魏纲,陈春来,余剑英.顶管施工引起的土体垂直变形计算方法研究[J].岩土力学,2007,28(3):619-624.
[3] 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,2002,21(3):388-392.
[4] 魏纲,朱奎,陈伟军.不同施工工况下双圆盾构引起的土体沉降研究[J].岩土工程学报,2011,33(3):477-482.
[5] 侯公羽,刘宏伟,李晶晶,等.基于开挖卸荷效应的地铁隧道施工过程数值分析[J].岩石力学与工程学报,2013,31(S1):2915-2924.
[6] 魏纲,姜鑫,张鑫海,等.地面出入式盾构法隧道施工引起的土体垂直变形[J].岩土力学,2018,39(3):993-1001.
[7] 林志,朱合华,夏才初.近间距双线大直径泥水盾构施工相互影响研究[J].岩土力学,2006,27(7):1181-1186.
[8] Zou Baoping, Wang Jianxiu, Tian Qian, et al. Numerical analysis of the soil deformation caused by tunneling under vehicle loads in the coastal reclamation area[J]. Mathematical Problems in Engineering, 2015,1:1-11.
[9] 刘树佳,白廷辉,廖少明,等.软土地区盾构施工参数对土体位移影响的滞后性试验研究[J].岩土力学,2017,38(3):857-865.
[10] 刘元雪,施建勇,许江,等.盾构法隧道施工数值模拟[J].岩土工程学报,2004,26(2):239-243.
[11] 唐晓武,朱季,刘维,等.盾构施工过程中的土体变形研究[J].岩石力学与工程报,2010,29(2):417-422.
[12] 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,2004,25(8):1330-1334.
[13] 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(S1):3317-3323.
[14] 杨俊,邵生俊.地铁盾构隧道穿越高架桥梁基的力学行为分析[J].水利与建筑工程学报,2015,13(5):190-194.
[15] 赵丽雅,许宏发,晋学辉,等.盾构隧道下穿铁路群的路基加固及沉降分析[J].水利与建筑工程学报,2017,15(4):85-90.