断层宽度对跨断层隧道错动反应特性影响的数值模拟
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摘要
为了研究断层宽度对跨断层岩体隧道错动反应特性的影响,利用大型有限元软件ABAQUS,建立了断层错动三维有限元计算模型。在此基础上,以走滑断层为例,对比分析了断层宽度逐渐增大的过程中,跨断层岩体隧道的错动反应特性。计算结果表明:走滑断层错动作用下,衬砌拱腰主要承受拉/压应力,拱顶和拱底主要承受剪应力;拉/压应力峰值出现在变形最为剧烈位置处,剪应力峰值出现在错动盘和断层交界面附近。走滑断层错动对衬砌的影响范围随断层宽度的不同而有所不同:当断层宽度由0逐级增加至20、40 m时,影响范围逐渐增大;当断层宽度由40 m增加至60 m时,影响范围基本不变,说明断层错动对衬砌的影响范围存在一限值。
In order to study the effects of fault width on characteristics of across-fault rock tunnel due to fault movement,the finite element software ABAUQS was used to establish a 3-D geological model.Then,the characteristics of across-fault rock tunnel in strike-slip fault movement were analyzed by changing the fault width.The result showed that the crown and soffit of lining,and the springing of lining were mainly subjected to shear stress and tensile/compressive stress,respectively.The maxima of tensile/compressive stress and shear stress appeared at the positions where deformation was most severe,and the interface appreared between the active plate and the fault.The influence scope of fault movement on lining increased obviously with the fault width from 0 m to 20 m and 40 m,but kept essentially constant from 40 m to 60 m.It was shown that there existed a limit of the influence scope of fault movement on lining.
In order to study the effects of fault width on characteristics of across-fault rock tunnel due to fault movement,the finite element software ABAUQS was used to establish a 3-D geological model.Then,the characteristics of across-fault rock tunnel in strike-slip fault movement were analyzed by changing the fault width.The result showed that the crown and soffit of lining,and the springing of lining were mainly subjected to shear stress and tensile/compressive stress,respectively.The maxima of tensile/compressive stress and shear stress appeared at the positions where deformation was most severe,and the interface appreared between the active plate and the fault.The influence scope of fault movement on lining increased obviously with the fault width from 0 m to 20 m and 40 m,but kept essentially constant from 40 m to 60 m.It was shown that there existed a limit of the influence scope of fault movement on lining.
引文
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[4]王文礼,苏灼谨,林峻弘,等.台湾集集大地震山岳隧道受损情形之探讨[J].现代隧道技术,2001,38(2):52-60.
[5]李天斌.汶川特大地震中山岭隧道变形破坏特征及影响因素分析[J].工程地质学报,2008,16(6):742-750.
[6]Wang W L,Wang T T,Su J J,et al.Assessment of damages inmountain tunnels due to the Taiwan Chi-Chi earthquake[J].Tun-nels&Underground Space,2001,16(3):133-150.
[7]熊炜,范文,彭建兵,等.正断层活动对公路山岭隧道工程影响的数值分析[J].岩石力学与工程学报,2010,29(增1):2845-2852.
[8]王琼,郭恩栋,杨丹,等.走滑断层位移作用下山岭隧道非线性反应分析[J].地震工程与工程振动,2010,30(2):119-122.
[9]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究[D].北京:北京交通大学,2011.
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