大跨度无衬砌蛋形黄土隧道围岩结构的静力和地震动稳定分析
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摘要
为得到大跨度无衬砌蛋形黄土隧道围岩结构在重力和地震作用下的剪切破坏规律,借助于ANSYS软件,根据强度折减法,分别对蛋形无衬砌黄土隧道进行重力分析和地震作用下的动力稳定性分析;探讨跨度、覆土厚度和地震烈度对围岩抗剪强度安全系数的影响。数值算例结果表明:从抗剪强度的角度来看,大跨度无衬砌蛋形浅埋黄土隧道虽能达到初次衬砌的要求,但均不能达到正常使用的稳定性要求;安全系数随跨度、覆土厚度以及地震烈度的增大有所降低,但影响幅度不大。得出的结论可为大跨度蛋形无衬砌隧道的实际施工提供理论基础,并为定量分析大跨度有衬砌黄土隧道的地震反应提供参考。
In order to obtain the shear failure laws of unlined egg-shaped loess tunnel under gravity action and earthquake action,using FEM software ANSYS and the shear strength reduction method,stability analysis is made about the soil mass surrounding tunnel of large-span unlined egg-shaped loess tunnel under the action of gravity and seismic.The important influences of shear strength safety factor are discussed on the span or coverage soil thickness of tunnel or seismic intensity.Result shows that: from the perspective of shear strength,the large-span unlined egg loess tunnel is able to achieve the requirements of initial lining,but can not reach the requirement of stability safety factor in normal use state.When the tunnel span or the coverage soil thickness of tunnel or seismic intensity increases,the shear strength safety factor will become low,but the magnitude of impact is not very obvious.And so a theoretical basis for the actual construction will be provided for the the large-span unlined egg-shaped loess tunnel,and a reference will be provided for the large-span lined structure design of loess tunnel under earthquake.
In order to obtain the shear failure laws of unlined egg-shaped loess tunnel under gravity action and earthquake action,using FEM software ANSYS and the shear strength reduction method,stability analysis is made about the soil mass surrounding tunnel of large-span unlined egg-shaped loess tunnel under the action of gravity and seismic.The important influences of shear strength safety factor are discussed on the span or coverage soil thickness of tunnel or seismic intensity.Result shows that: from the perspective of shear strength,the large-span unlined egg loess tunnel is able to achieve the requirements of initial lining,but can not reach the requirement of stability safety factor in normal use state.When the tunnel span or the coverage soil thickness of tunnel or seismic intensity increases,the shear strength safety factor will become low,but the magnitude of impact is not very obvious.And so a theoretical basis for the actual construction will be provided for the the large-span unlined egg-shaped loess tunnel,and a reference will be provided for the large-span lined structure design of loess tunnel under earthquake.
引文
[1]陈国兴.岩土地震工程学[M].北京:科学出版社,2007
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[4]邱陈瑜,郑颖人,宋雅坤,等.采用ANSYS软件讨论无衬砌黄土隧洞安全系数[J.]地下空间与工程学报,2009,5(2):291-296(Qiu Chenyu,Zheng Yingren,Song Yakun,et al.Exploring the safety factors of unlined loess tunnel byANSYS[J].Chinese Journal of Underground Space andEngineering,2009,5(2):291-296(in Chinese))
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[7]Zaretskii1 Y K,Karabaev1 M I,Khachaturyan N S.Construction monitoring of a shallow tunnel in theLefortovo District of Moscow[J].Soil Mechanics andFoundation Engineering,2004,41(2):45-51
[8]张红,郑颖人,杨臻,等.黄土隧洞安全系数初探[J].地下空间与工程学报,2009,5(2):297-306(ZhangHong,Zheng Yingren,Yang Zhen,et al.Exploration ofsafety factors of the loess tunnel[J.]Chinese Journal ofUnderground Space and Engineering,2009,5(2):297-306(in Chinese))
[9]谷兆祺,彭守拙,李仲奎.地下洞室工程[M.]北京:清华大学出版社,1994
[10]王峻,王兰民,李兰.永登5.8级地震中黄土震陷灾害的探讨[J.]地震研究,2005,28(4):393-397(WangJun,Wang Lanmin,Li Lan.Discussion on the loesssubsidence disaster caused by the Yongdeng M5.8earthquake[J.]Journal of Seimological Research,2005,28(4):393-397(in Chinese))
[11]郑颖人,陈祖煜,王恭先,等.边坡与滑坡工程治理[M.]北京:人民交通出版社,2007
[12]郑颖人,赵尚毅,张鲁渝.用有限元强度折减法进行边坡稳定分析[J].中国工程科学,2002,4(10):57-62(Zheng Yingren,Zhao Shangyi,Zhang Luyu.Slopestability analysis by strength reduction FEM[J].Engineering Science,2002,4(10):57-62(in Chinese))
[13]周健,白冰,徐建平.土动力学理论与计算[M.]北京:中国建筑工业出版社,2001
[14]GB 50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001:26-27
[2]马行东,李海波,肖克强,等.动荷载作用下地下岩体洞室应力特征的影响因素分析[J.]防灾减灾工程学报,2006,26(2):164-169(Ma Xingdong,Li Haibo,XiaoKeqiang,et al.Under dynamic load characteristics ofunderground rock cavern stress factors[J].Journal ofDisaster Prevention and Mitigation Engineering,2006,26(2):164-169(in Chinese))
[3]王勇,乔春生,孙彩红,等.基于SVM的溶洞顶板安全厚度智能预测模型[J.]岩土力学,2006,27(6):1000-1004(Wang Yong,Qiao Chunsheng,Sun Caihong,et al.Forecasting model of safe thickness for roof of karst cavetunnel based on support vector machines[J.]Rock and SoilMechanics,2006,27(6):1000-1004(in Chinese))
[4]邱陈瑜,郑颖人,宋雅坤,等.采用ANSYS软件讨论无衬砌黄土隧洞安全系数[J.]地下空间与工程学报,2009,5(2):291-296(Qiu Chenyu,Zheng Yingren,Song Yakun,et al.Exploring the safety factors of unlined loess tunnel byANSYS[J].Chinese Journal of Underground Space andEngineering,2009,5(2):291-296(in Chinese))
[5]Yang Xiaoli,Huang Fu.Stability analysis of shallow tunnelssubjected to seepage with strength reduction theory[J.]Journal of Central South University of Technology,2009,16(6):1001-1005
[6]Sterpi1 D,Cividini A.A physical and numerical investigationon the stability of shallow tunnels in strain softening media[J.]Rock Mechanics and Rock Engineering,2004,37(4):277-298
[7]Zaretskii1 Y K,Karabaev1 M I,Khachaturyan N S.Construction monitoring of a shallow tunnel in theLefortovo District of Moscow[J].Soil Mechanics andFoundation Engineering,2004,41(2):45-51
[8]张红,郑颖人,杨臻,等.黄土隧洞安全系数初探[J].地下空间与工程学报,2009,5(2):297-306(ZhangHong,Zheng Yingren,Yang Zhen,et al.Exploration ofsafety factors of the loess tunnel[J.]Chinese Journal ofUnderground Space and Engineering,2009,5(2):297-306(in Chinese))
[9]谷兆祺,彭守拙,李仲奎.地下洞室工程[M.]北京:清华大学出版社,1994
[10]王峻,王兰民,李兰.永登5.8级地震中黄土震陷灾害的探讨[J.]地震研究,2005,28(4):393-397(WangJun,Wang Lanmin,Li Lan.Discussion on the loesssubsidence disaster caused by the Yongdeng M5.8earthquake[J.]Journal of Seimological Research,2005,28(4):393-397(in Chinese))
[11]郑颖人,陈祖煜,王恭先,等.边坡与滑坡工程治理[M.]北京:人民交通出版社,2007
[12]郑颖人,赵尚毅,张鲁渝.用有限元强度折减法进行边坡稳定分析[J].中国工程科学,2002,4(10):57-62(Zheng Yingren,Zhao Shangyi,Zhang Luyu.Slopestability analysis by strength reduction FEM[J].Engineering Science,2002,4(10):57-62(in Chinese))
[13]周健,白冰,徐建平.土动力学理论与计算[M.]北京:中国建筑工业出版社,2001
[14]GB 50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001:26-27
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