地震作用下无衬砌直墙式黄土隧洞的围岩稳定性分析
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摘要
为了得到无衬砌直墙式黄土隧洞在地震作用下的剪切破坏规律,根据动力和静力分析模型,应用抗剪强度折减法和ANSYS软件,分别对小跨度无衬砌黄土隧洞进行重力分析和地震作用下的动力响应分析,得到了无衬砌黄土隧洞的围岩抗剪强度安全系数,讨论了无衬砌黄土隧洞的跨度、覆土厚度和地震烈度对围岩抗剪强度安全系数的影响。研究结果表明:从黄土围岩材料剪切破坏的角度来看,在7、8及9度的黄土地区修建的小跨度浅埋无衬砌隧洞,其抗剪强度安全系数均大于2.0。
In order to obtain the shear failure laws of vertical ridge unlined loess tunnel under earthquake,according to dynamic and static analysis model,the shear strength reduction method and the ANSYS software were respectively applied to the unlined loess tunnel of small span for the static stability analysis and the dynamic response analysis under earthquake,and the shear strength safety factors of unlined loess tunnel were obtained,and the influences of calculation parameters like the tunnel span and the coverage soil thickness of tunnel and seismic intensity on the shear strength safety factor were discussed.The results show that:from perspective of loess wall soil material shear failure,the shear strength safety factors of shallow unlined tunnels which is small span,which are built in the loess region of 7 degree and 8 degree and 9 degree,are greater than 2.0.
In order to obtain the shear failure laws of vertical ridge unlined loess tunnel under earthquake,according to dynamic and static analysis model,the shear strength reduction method and the ANSYS software were respectively applied to the unlined loess tunnel of small span for the static stability analysis and the dynamic response analysis under earthquake,and the shear strength safety factors of unlined loess tunnel were obtained,and the influences of calculation parameters like the tunnel span and the coverage soil thickness of tunnel and seismic intensity on the shear strength safety factor were discussed.The results show that:from perspective of loess wall soil material shear failure,the shear strength safety factors of shallow unlined tunnels which is small span,which are built in the loess region of 7 degree and 8 degree and 9 degree,are greater than 2.0.
引文
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[14]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.Slope stability analysis by strength reduction FEM[J].Engineering Science,2002,4(10):57-62.
[15]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.Wang Jun,Wang Lanmin,Li Lan.Discussion on the loess subsid-ence disaster caused by the Yongdeng M5.8earthquake[J].Jour-nal of Seimological Research,2005,28(4):393-397.
[16]GB50011-2001,建筑抗震设计规范[S].北京:中国建筑工业出版社,2001:26-27.
[2]陈国兴.岩土地震工程学[M].北京:科学出版社,2007.Chen Guoxing.Geotechnical earthquake engineering[M].Beijing:Science Press,2007.
[3]陈国兴,张克绪,谢君斐.黄土崖窑洞抗震性能分析[J].哈尔滨建筑大学学报,1995,28(1):16-21.Chen Guoxing,Zhang Kexu,Xie Junfei.Aseismic performance analy-sis of the cave dewlling on the loess precipice[J].Journal of Harbin University of Civil Engineering and Architecture,1995,28(1):16-21.
[4]高峰,任侠.黄土窑洞地震反应分析[J].兰州铁道学院学报(自然科学版),2001,20(3):12-18.Gao Feng,Ren Xia.Seimic responses analysis of a loess cave[J].Journal of Lanzhou Railway University(Natural Sciences Edition),2001,20(3):12-18.
[5]陈立伟,彭建兵,范文.地震作用下黄土暗穴的稳定性[J].长安大学学报(自然科学版),2007,27(6):34-36.Chen Liwei,Peng Jianbing,Fan Wen.Stability of loess hidden hole under earthquake[J].Journal of Chang’an University(Natural Sci-ence Edition),2007,27(6):34-36.
[6]郑颖人,邱陈瑜,张红,等,关于土体隧洞围岩稳定性分析方法的探索[J].岩石力学与工程学报,2008,27(10):254-260.Zheng Yingren,Qiu Chenyu,Zhang Hong,et al.Exploration of stabil-ity analysis methods of surrounding rocks in soil tunel[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(10):254-260.
[7]邱陈瑜,郑颖人,宋雅坤.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.Exploring the safety fac-tors of unlined loess tunnel by ANSYS[J].Chinese Journal of Un-derground Space and Engineering,2009,5(2):291-296.
[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.Zhang Hong,Zheng Yingren,Yang Zhen,et al.Exploration of safety factors of the loess tunnel[J].Chinese Journal of Underground Space and Engineering,2009,5(2):297-306.
[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.Gu Zhaoqi,Peng Shouzhuo,Li Zhongkui.Underground tunel engi-neering[M].Beijing:Tsinghua University Press,1994.
[10]彭建兵,李庆春,陈志新,等.黄土洞穴灾害[M].北京:科学出版社,2008.Peng Jianbing,Li Qingchun,Chen Zhixin,et al.Loess cave disaster[M].Beijing:Science Press,2008.
[11]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.Zhou Jian,Bai Bing,Xu Jianping.Theory and calculation of soil dy-namics[M].Beijing:China Building Industry Press,2001.
[12]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.Zheng Yingren,Chen Zuyu,Wang Gongxian,et al.Engineering treatment of slope&landslide[M].Beijing:China Communications Press,2007.
[13]郑颖人,赵尚毅,邓楚键,等.限元极限分析法发展及其在岩土工程中的应用[J].中国工程科学,2006,8(12):39-61.Zheng Yingren,Zhao Shangyi,Deng Chujian,et al.Development of finite element limit analysis method and its applications in geotech-nical engineering[J].Engineering Sciences,2006,8(12):39-61.
[14]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.Slope stability analysis by strength reduction FEM[J].Engineering Science,2002,4(10):57-62.
[15]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.Wang Jun,Wang Lanmin,Li Lan.Discussion on the loess subsid-ence disaster caused by the Yongdeng M5.8earthquake[J].Jour-nal of Seimological Research,2005,28(4):393-397.
[16]GB50011-2001,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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