龙溪隧道出口段在地震荷载下变形破裂特征及其数值模拟分析
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摘要
龙溪隧道出口段主要有表层覆盖层和下伏基岩组成。文章根据边坡地形地貌以及地质结构分析了隧道在地震作用下的变形破裂特征。在此基础上,运用ansys有限元软件对龙溪隧道在Ⅺ度地震烈度荷载作用下的动力响应进行分析,并结合5·12地震后的现场调查,将数值模拟结果与现场的破坏现象进行了对比,得出地震作用下隧道洞口横向边坡的动力反应从坡内向坡外、坡底向坡顶整体上呈逐步放大的趋势;从洞口至基岩与崩坡积分界面处,变形主要在隧道管段之间的接缝处发生相对错动,并且有逐渐减弱的趋势;在隧道基岩与覆盖层分界面上,隧道衬砌变形量发生突变,衬砌开裂方向与基覆界面产状基本一致,从分界面向内,衬砌变形变得不明显。研究这一变形破坏现象,对认识隧道洞口段在地震作用下的变形破坏规律及极震区隧道洞口段的抗震结构设计具有重要意义。
The paper analyzes deformation -fracture characteristics of Longxi tunnel under 5.12 Great Earthquake. By using ANSYS finite element software authors analyzed the earthquarke dynamic response properties of Longxi tunnel under seismic load incorporating the spot investigation after the earthquake, comparing the destruction at the site with numerical simulation results. It concluded that the earthquarke dynamic responses on the side slopes of tunnel entrance were large, and more larger from inside to outside, from base to top of the slop. There were severe damages at the interface between the covering layer and underlying bedrock. Varying degree dislocations also occurred at the construction joints of tunnel lining. Displacement difference of the rock lithology was one of the main reasons that the tunnel lining was destroyed along the interface. Research results could contribute much to tunnel anti-seismeic design and tunnel route selection in earthquake areas in the future.
The paper analyzes deformation -fracture characteristics of Longxi tunnel under 5.12 Great Earthquake. By using ANSYS finite element software authors analyzed the earthquarke dynamic response properties of Longxi tunnel under seismic load incorporating the spot investigation after the earthquake, comparing the destruction at the site with numerical simulation results. It concluded that the earthquarke dynamic responses on the side slopes of tunnel entrance were large, and more larger from inside to outside, from base to top of the slop. There were severe damages at the interface between the covering layer and underlying bedrock. Varying degree dislocations also occurred at the construction joints of tunnel lining. Displacement difference of the rock lithology was one of the main reasons that the tunnel lining was destroyed along the interface. Research results could contribute much to tunnel anti-seismeic design and tunnel route selection in earthquake areas in the future.
引文
[1]王希宝.都汶公路龙溪隧道围岩大变形机制及防治研究[R].成都理工大学档案馆,2008-06Wang Xibao.The Research of Large Deformation mechanism and prevention of Surrounding Rock of Longxi Tunnel on Duwen road[R].The Archive of Chengdu University of Technology,2008.6
[2]徐鹤山.ANSYS建筑钢结构工程实例分析[M].北京:机械工业出版社,2007-08Xu Heshan.Example analysis of Steel Structure Engineering of ANSYS Contruction[M].Beijing:Mechanical Industry Press,2007.8
[3]许增会,宋宏伟,赵坚.地震对隧道围岩稳定性影响的数值模似分析[J].中国矿业大学学报,2004,33(1):41~44Xu Zenghui,Song Hongwei,Zhao Jian.Numerical Analysis of Stability of Tunnel Surrounding Rocks Under Earthquake[J].Journal of China University of Mining&Technology,2004,33(1):41~44
[4]蒋树屏,蒋华,王晓雯等.高烈度地震区公路隧道洞口段地震响应分析[J].现代隧道技术,2008,45(6):5~10Jiang Shuping,Jiang hua,Wang Xiaowen et al.Analysis of Seismic Response in Tunnel Entrance of Highway in Seismic Region with Strong Motion[J].Modern Tunnelling Technology,2008,45(6):5~10
[5]靳晓光,张永兴.大断面隧道支护结构地震反应特性分析[J].重庆建筑大学学报,2008,30(1):44~47Jin Xiaoguang,Zhang yongxing.Earthquake Response Properties of the Support Structure of Large Cross Section Tunnel[J].Journal of Chongqing Jianzhu University,2008,30(1):44~47
[6]李育枢,高广运,李天斌.偏压隧道洞口边坡地震动力反应及稳定性分析[J].地下空间与工程学报,2006,2(5):738~743Li Yushu,Gao Guangyun,Li Tianbin.Analysis of Earthquake Response and Stability Evaluation for Transverse Slope at Secund Tunnel Portal[J].Chinese Journal of Underground Space and Engineering,2006,2(5):738~743
[2]徐鹤山.ANSYS建筑钢结构工程实例分析[M].北京:机械工业出版社,2007-08Xu Heshan.Example analysis of Steel Structure Engineering of ANSYS Contruction[M].Beijing:Mechanical Industry Press,2007.8
[3]许增会,宋宏伟,赵坚.地震对隧道围岩稳定性影响的数值模似分析[J].中国矿业大学学报,2004,33(1):41~44Xu Zenghui,Song Hongwei,Zhao Jian.Numerical Analysis of Stability of Tunnel Surrounding Rocks Under Earthquake[J].Journal of China University of Mining&Technology,2004,33(1):41~44
[4]蒋树屏,蒋华,王晓雯等.高烈度地震区公路隧道洞口段地震响应分析[J].现代隧道技术,2008,45(6):5~10Jiang Shuping,Jiang hua,Wang Xiaowen et al.Analysis of Seismic Response in Tunnel Entrance of Highway in Seismic Region with Strong Motion[J].Modern Tunnelling Technology,2008,45(6):5~10
[5]靳晓光,张永兴.大断面隧道支护结构地震反应特性分析[J].重庆建筑大学学报,2008,30(1):44~47Jin Xiaoguang,Zhang yongxing.Earthquake Response Properties of the Support Structure of Large Cross Section Tunnel[J].Journal of Chongqing Jianzhu University,2008,30(1):44~47
[6]李育枢,高广运,李天斌.偏压隧道洞口边坡地震动力反应及稳定性分析[J].地下空间与工程学报,2006,2(5):738~743Li Yushu,Gao Guangyun,Li Tianbin.Analysis of Earthquake Response and Stability Evaluation for Transverse Slope at Secund Tunnel Portal[J].Chinese Journal of Underground Space and Engineering,2006,2(5):738~743
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