考虑地震影响的小间距隧道围岩流变损伤
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摘要
针对隧道围岩的流变特性,基于拟静力法建立了隧道围岩在流变过程中有地震作用时的长期变形与稳定性分析格式,并对三车道小间距隧道的开挖施工过程进行了粘弹塑性数值分析,探讨了地震对小间距隧道围岩与支护结构的影响。数值仿真对比分析表明:地震因素对隧道周边各点的水平位移影响较大,对竖向位移影响较小;中间岩壁在地震影响下,可能发生错动破坏,而且在施工方法的共同影响下有侧向移动的趋势,这将对小间距隧道的安全稳定产生不利的影响。给出了在典型施工方式下,三车道隧道围岩破坏特征及其施工过程中小间距隧道洞周特殊点粘弹塑性的变形规律,可作为小间距隧道设计参考。
Based on quasi-static method,considering the earthquake action in rheological process of surrounding rock for small spacing tunnels,the formulas for analyzing the long-term deformation and stability are set up.The visco-elasto-plastic numerical simulation is studied in consideration of the excavating construction,and the influence of earthquakes on the surrounding rock and supports is researched for three roadway tunnels with small spacing.It is shown by the comparison of simulating results that the earthquake factors have larger influence on horizontal displacements than on vertical ones at all points on tunnel boundary.The shear damage and lateral movement of the rock interval between two tunnels may take place due to earthquakes and construction,which have an unfavorable effect on the safe and the stability of tunnels with small spacing.The damage characteristic of surrounding rock and the visco-elasto-plastic deformation law at particular points are given under the condition of typical construction way for three driveway tunnels.Those have a reference meaning for tunnel engineering design.2 tabs,9 figs,8 refs.
Based on quasi-static method,considering the earthquake action in rheological process of surrounding rock for small spacing tunnels,the formulas for analyzing the long-term deformation and stability are set up.The visco-elasto-plastic numerical simulation is studied in consideration of the excavating construction,and the influence of earthquakes on the surrounding rock and supports is researched for three roadway tunnels with small spacing.It is shown by the comparison of simulating results that the earthquake factors have larger influence on horizontal displacements than on vertical ones at all points on tunnel boundary.The shear damage and lateral movement of the rock interval between two tunnels may take place due to earthquakes and construction,which have an unfavorable effect on the safe and the stability of tunnels with small spacing.The damage characteristic of surrounding rock and the visco-elasto-plastic deformation law at particular points are given under the condition of typical construction way for three driveway tunnels.Those have a reference meaning for tunnel engineering design.2 tabs,9 figs,8 refs.
引文
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[7]黄润秋,许强,陶连金,等.地质灾害过程模拟和控制研究[M].北京:科学出版社,2004.HUANG Run-qiu,XU Qiang,TAO Lian-jin,et al.Study on the Simulation and Control for the GeologyDisaster Process[M].Beijing:Science Press,2004.
[8]王芝银.隧道围岩粘弹塑性损伤有限元分析的统一模式[J].西安公路交通大学学报,1997,17(2):32 35.WANG Zhi-yin.A Unified form of Visco-elastc-plasit-ic-damage Finite Element Analysis for SurroundingRock of Tunnels[J].Journal of Xi’an Highway Uni-versity,1997,17(2):32 35.
[2]靳晓光,刘伟,陈少华,等.小净距公路隧道施工过程的数值模拟[C]//.2003年全国公路隧道学术会议论文集.北京:人民交通出版社,2003:118 124.JIN Xiao-guang,LIU Wei,CHENG Shao-hua,et al.Numerical Simulation of Construction Process of HighwayTunnel with Little Distances[C]//.Proceedings of Sym-posium on Highway Tunnel(China,2003).Beijing:Peo-ple’s Communications Press,2003:118 124.
[3]张玉军,朱维申,杨家岭.近距离双隧道开挖与支护稳定性的粘弹塑性有限元计算[J].岩石力学与工程学报,1999,18(增刊):855 859.ZHANG Yu-jun,ZHU Wei-shen,YANG Jia-lin.Vis-co-elasto-plastic FEM Calculation on the Stability ofthe Excavation and Lining Structure for a NearbyDouble Tunnel[J].Chinese Journal of Rock Mechanicsand Engineering,1999,18(Sup):855 859.
[4]刘胜利,施成华,彭立敏,等.小间距隧道施工期间洞室与结构的稳定性评判[J].西部探矿工程,2003(3):108111.LIU Sheng-li,SHI Cheng-hua,PENG Li-min,et al.Evaluation on Stability of Chamber and Structure ofSmall-interval Tunnel During Construction[J].West-China Exploration Engineering,2003(3):108 111.
[5]刘艳青,钟世航,卢汝绥,等.小净距并行隧道力学状态的试验研究[J].岩石力学与工程学报,2000,19(5):590 594.LIU Yan-qing,ZHONG Shi-hang,LU Ru-sui.et al.Experimental Study on Mechanical Characteristics ofTwin Tunnels with Small Spacing[J].Chinese Journalof Rock Mechanics and Engineering,2000,19(5):590594.
[6]王明年,李志业,刘智成,等.软弱围岩3孔小间距平行浅埋隧道施工力学研究[J].铁道建筑技术,2002(4):11 14.WANG Ming-nian,LI Zhi-ye,LIU Zhi-cheng,et al.A Mechanical Research on Shallow Buried Three-holeParallel Nearby Tunnel Construction for Soft Rock[J].Railway Construction Technology,2002(4):11 14.
[7]黄润秋,许强,陶连金,等.地质灾害过程模拟和控制研究[M].北京:科学出版社,2004.HUANG Run-qiu,XU Qiang,TAO Lian-jin,et al.Study on the Simulation and Control for the GeologyDisaster Process[M].Beijing:Science Press,2004.
[8]王芝银.隧道围岩粘弹塑性损伤有限元分析的统一模式[J].西安公路交通大学学报,1997,17(2):32 35.WANG Zhi-yin.A Unified form of Visco-elastc-plasit-ic-damage Finite Element Analysis for SurroundingRock of Tunnels[J].Journal of Xi’an Highway Uni-versity,1997,17(2):32 35.
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