不同倾角逆断层错动对隧道结构影响理论分析
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摘要
结合某隧道工程项目,采用FLAC3D有限差分软件,建立相应的数值模型,分析由于地震引发的逆断层错动作用对正交穿越断层隧道的影响,并揭示其影响机理。结果表明断层错动对主动盘内隧道的影响范围远大于被动盘,断层两侧隧道衬砌竖向相对位移随着错距量的增加而发生线性增长,且断层对衬砌影响范围不受错距大小的影响。在断层上盘与下盘之间挤压力的作用下,衬砌边墙处最容易发生拉裂破坏和剪切破坏,为最不利位置,拱顶次之,仰拱所受影响最小。在逆断层倾角一定的情况下,随着错动距离的增大,衬砌不同部位受到的最大主应力、最小主应力、剪应力均整体呈增大趋势。对依托工程隧道的安全性和可靠性进行评价,同时对类似特殊修建条件下隧道的设计和施工具有一定的指导作用。
For a tunnel project, the finite difference software FLAC3 D is used to establish the numerical model,so that the influence of earthquake induced dislocation of reverse faults on the fault-crossing tunnel can be analyzed, and the influence mechanism can be disclosed. It is found that the effect of fault dislocation on the tunnel in active plate is much larger than that of the passive plate, the vertical relative displacement increases linearly with the dislocation spacing, and the impact of the fault on the lining is not affected by the dislocation spacing. Due to the squeezing action between the upper plate and the lower plate of reverse fault, the most adverse position, which is most susceptible to tensile rupture and shear failure is the side wall of lining, next is the vault, and the last is the inverted arch. The maximum principal stress, the minimum principal stress and the shear stress in different positions of the lining increase with the increase of dislocation spacing. The safety and reliability of the present tunnel are assessed in this study, which can be referred by the design and construction of similar tunnel projects.
For a tunnel project, the finite difference software FLAC3 D is used to establish the numerical model,so that the influence of earthquake induced dislocation of reverse faults on the fault-crossing tunnel can be analyzed, and the influence mechanism can be disclosed. It is found that the effect of fault dislocation on the tunnel in active plate is much larger than that of the passive plate, the vertical relative displacement increases linearly with the dislocation spacing, and the impact of the fault on the lining is not affected by the dislocation spacing. Due to the squeezing action between the upper plate and the lower plate of reverse fault, the most adverse position, which is most susceptible to tensile rupture and shear failure is the side wall of lining, next is the vault, and the last is the inverted arch. The maximum principal stress, the minimum principal stress and the shear stress in different positions of the lining increase with the increase of dislocation spacing. The safety and reliability of the present tunnel are assessed in this study, which can be referred by the design and construction of similar tunnel projects.
引文
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[8]李学锋,代志萍,谷雪影,等.活断层错动位移下变形缝间距对隧道内力的影响[J].隧道建设,2014,34(3):237-242(Li Xuefeng,Dai Zhiping,Gu Xueying,et al.Influence of deformation joint spacing on internal force of tunnel under active fault movement[J].Tunnel Construction,2014,34(3):237-242(in Chinese))
[2]赵伯明,刘洋.断层错动对隧道的影响分析[J].华南地震,2009,29(1):33-41(Zhao Boming,Liu yang.Analysis on effects of fault slip on tunnel[J].South China Journal of Selsmology,2009,29(1):33-41(in Chinese))
[3]邵润萌.断层错动作用下隧道工程损伤及岩土失效扩展机理研nmengè??o<究[D]..Study北京:北京交通大学,2011(Shao Ru on the mechanism of tunnel damage and geotechnical failure propagation due to fault rupture[D].Beijing:Beijing Jiaotong University,2011(in Chinese))
[4]刘学增,林亮伦,桑运龙.逆断层黏滑错动对公路隧道的影响[J].同济大学学报:自然科学版,2012,40(7):1008-1014(Liu Xuezeng,Lin Lianglun,Sang Yunlong.Effect of thrust fault stick-slip rupture on road tunnel[J].Jouranl of Tongji University:Natural Science Edition,2012,40(7):1008-1014(in Chinese))
[5]刘恺.成兰线跨断层隧道的错动破坏机理研究及地震[D].北京:北京交通大学,2011(Liu Kai.Study on the failure mechanism under fault movement and seismic dynamic response of the chenglan across-fault tunnel[D].Beijing:Beijing Jiaotong University,2011(in Cinese))
[6]许丁予.高铁隧道工程穿越汉川地震断裂带抗错动机理与设计参数研究[D].北京:北京交通大学,2015(Xu Dingyu.Anti-breaking mechanism and design parameters research on high-speed railway tunnel engineering through the Wenchuan seismic fracture zone[D].Beijing:Beijing Jiaotong University,2015(in Chinese))
[7]李林,何川,耿萍,等.浅埋偏压洞口段隧道地震响应振动台模型试验研究[J].岩石力学与工程学报,2011,30(12):2540-2548(Li Lin,He Chuan,Geng Ping,et al.Study of shaking table model test for seismic response of portal section of shallow unsymmetrical loading tunnel[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(12):2540-2548(in Chinese))
[8]李学锋,代志萍,谷雪影,等.活断层错动位移下变形缝间距对隧道内力的影响[J].隧道建设,2014,34(3):237-242(Li Xuefeng,Dai Zhiping,Gu Xueying,et al.Influence of deformation joint spacing on internal force of tunnel under active fault movement[J].Tunnel Construction,2014,34(3):237-242(in Chinese))