基于FLAC3D大断面浅埋偏压隧道开挖方式数值分析
|
摘要
以V级软弱围岩杏花村偏压隧道工程为背景,应用有限差分软件FLAC3D对大断面偏压隧道进行开挖数值模拟,研究大断面浅埋偏压隧道中微台阶法与环形开挖预留核心土开挖的不同效果。结合杏花村三车道隧道施工实测数据,通过对比分析发现模拟结果与实际监测结果一致。FLAC3D准确模拟软弱围岩浅埋偏压隧道开挖,结果表明:在大断面偏压隧道开挖中,偏压侧位移较大,施工过程中,可采取在偏压侧设置挡土墙或加厚衬砌厚度的措施。通过对数值模拟中围岩应力状态、衬砌结构内力的比较,综合考虑后采取环形开挖预留核心土法进行大断面偏压隧道开挖,有较好的施工效果。
Based on the excavation of the bias tunnel of Xinghua Village in V-class weak surrounding rock,this paper uses the finite difference software FLAC3 Dto simulate the excavation of large-section bias tunnel,and studies the step method and circular opening of shallow-buried large-section bias tunnel.The different effects of excavation reserved core soil excavation were combined with the measured data of the three-lane tunnel construction of Xinghua Village for comparative analysis.The simulation results were consistent with the actual monitoring results.The result shows that in the excavation of large-section biased tunnel,the vertical displacement of the deep buried side is larger than that of the shallow buried side.During the construction process,the support and protection of the vault and the deep buried side should be paid attention to;the FLAC3 Dis accurately simulated.Excavation of shallow buried tunnel with weak surrounding rock,through comparison of stress and displacement of surrounding rock in numerical simulation,comprehensively considering the excavation of large-section biased tunnel with ring excavation reserved core soil method has better construction effect.
Based on the excavation of the bias tunnel of Xinghua Village in V-class weak surrounding rock,this paper uses the finite difference software FLAC3 Dto simulate the excavation of large-section bias tunnel,and studies the step method and circular opening of shallow-buried large-section bias tunnel.The different effects of excavation reserved core soil excavation were combined with the measured data of the three-lane tunnel construction of Xinghua Village for comparative analysis.The simulation results were consistent with the actual monitoring results.The result shows that in the excavation of large-section biased tunnel,the vertical displacement of the deep buried side is larger than that of the shallow buried side.During the construction process,the support and protection of the vault and the deep buried side should be paid attention to;the FLAC3 Dis accurately simulated.Excavation of shallow buried tunnel with weak surrounding rock,through comparison of stress and displacement of surrounding rock in numerical simulation,comprehensively considering the excavation of large-section biased tunnel with ring excavation reserved core soil method has better construction effect.
引文
[1]秦长坤,皇民,潘梦阳.超前小导管注浆在大断面软弱围岩隧道中支护效应的数值分析[J].交通科技与经济,2018,20(3):76-80.
[2]雷啸天,潘梦阳,赵玉如.注浆方式对大断面软弱围岩隧道稳定性的影响及研究[J].交通科技与经济,2018,20(1):66-70.
[3]皇民,肖昭然,郭成龙,等.双侧壁导坑与CD法对超大断面隧道开挖影响分析[J].交通科技与经济,2016,18(4):63-66.
[4]皇民,肖昭然,郭成龙.大断面山岭隧道台阶法施工中台阶高度优化研究[J].河南科学,2016(2):247-251.
[5]刘小军,张永兴.浅埋偏压隧道洞口段合理开挖工序及受力特征分析[J].岩石力学与工程学报,2011,30(S1):3066-3073.
[6]台启民,张顶立,房倩,等.软弱破碎围岩隧道超前支护确定方法[J].岩石力学与工程学报,2016,35(1):109-118.
[7]陈光华.偏压软岩隧道施工技术[J].公路交通技术,2008(4):100-103.
[8]万民科.浅埋偏压小净距隧道力学特性及施工技术研究[D].长沙:中南大学,2013.
[9]徐燕,陈振邦,黄耀龙,等.基于ANSYS的偏压隧道CRD法开挖顺序数值分析[J].路基工程,2016(1):173-177.
[10]邓思远,杨其新,蒋雅君,等.软弱围岩大断面隧道环形开挖预留核心土法相关参数研究[J].城市轨道交通研究,2016,19(3):95-98.
[11]崔庆龙,郑少华,高抗.不同开挖方法对软弱围岩隧道影响模拟研究[J].交通科技,2017(5):86-89.
[12]徐前卫,程盼盼,苏培森,董继涛,陈国中.浅埋偏压隧道进洞施工力学特性研究[J].地下空间与工程学报,2017,13(5):1311-1318.
[13]赵玉成,贾晓旭.某软弱围岩隧道不同施工方法力学行为分析[J].筑路机械与施工机械化,2016,33(9):80-85.
[14]高文学,孙文龙,周文旭,等.浅埋偏压隧道开挖数值模拟与监测分析[J].施工技术,2011,40(3):48-50.
[15]关宝树,赵勇.软弱围岩隧道施工技术[M].北京:人民交通出版社,2011.
[16]潘昌实.隧道力学数值方法[M].北京:中国铁道出版社,1995.
[17]丁录董.基于数值模拟的隧道开挖及支护方法选择[J].勘察科学技术,2012(3):9-12.
[2]雷啸天,潘梦阳,赵玉如.注浆方式对大断面软弱围岩隧道稳定性的影响及研究[J].交通科技与经济,2018,20(1):66-70.
[3]皇民,肖昭然,郭成龙,等.双侧壁导坑与CD法对超大断面隧道开挖影响分析[J].交通科技与经济,2016,18(4):63-66.
[4]皇民,肖昭然,郭成龙.大断面山岭隧道台阶法施工中台阶高度优化研究[J].河南科学,2016(2):247-251.
[5]刘小军,张永兴.浅埋偏压隧道洞口段合理开挖工序及受力特征分析[J].岩石力学与工程学报,2011,30(S1):3066-3073.
[6]台启民,张顶立,房倩,等.软弱破碎围岩隧道超前支护确定方法[J].岩石力学与工程学报,2016,35(1):109-118.
[7]陈光华.偏压软岩隧道施工技术[J].公路交通技术,2008(4):100-103.
[8]万民科.浅埋偏压小净距隧道力学特性及施工技术研究[D].长沙:中南大学,2013.
[9]徐燕,陈振邦,黄耀龙,等.基于ANSYS的偏压隧道CRD法开挖顺序数值分析[J].路基工程,2016(1):173-177.
[10]邓思远,杨其新,蒋雅君,等.软弱围岩大断面隧道环形开挖预留核心土法相关参数研究[J].城市轨道交通研究,2016,19(3):95-98.
[11]崔庆龙,郑少华,高抗.不同开挖方法对软弱围岩隧道影响模拟研究[J].交通科技,2017(5):86-89.
[12]徐前卫,程盼盼,苏培森,董继涛,陈国中.浅埋偏压隧道进洞施工力学特性研究[J].地下空间与工程学报,2017,13(5):1311-1318.
[13]赵玉成,贾晓旭.某软弱围岩隧道不同施工方法力学行为分析[J].筑路机械与施工机械化,2016,33(9):80-85.
[14]高文学,孙文龙,周文旭,等.浅埋偏压隧道开挖数值模拟与监测分析[J].施工技术,2011,40(3):48-50.
[15]关宝树,赵勇.软弱围岩隧道施工技术[M].北京:人民交通出版社,2011.
[16]潘昌实.隧道力学数值方法[M].北京:中国铁道出版社,1995.
[17]丁录董.基于数值模拟的隧道开挖及支护方法选择[J].勘察科学技术,2012(3):9-12.