铁路隧道下穿既有公路地层变形特性研究
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摘要
文章结合张唐铁路工程燕山隧道下穿公路出口段,采用三维有限差分程序,研究分析了其施工过程中的地层变形特性、力学响应、能量积聚及塑性区分布特征。研究结果表明:公路最大沉降量小于规范要求,围岩竖向最大变形为20 mm,水平变形为16 mm;掌子面前方挤出变形明显,最大值为38 mm;边墙能量密度集中现象较显著,位于距洞壁5 m深部围岩处;掌子面前方6 m左右围岩处出现能量积聚,为掌子面稳定关键部位;塑性区主要集中在掌子面前方、拱肩、边墙及墙脚。为此,建议对掌子面进行预加固,保证墙脚和拱肩部位配筋,提高结构整体稳定性。
Based on the Yanshan tunnel underpassing highway on Zhangjiakou-Tangshan railway,it analyzes the characteristics of stratum deformation,mechanical response,energy accumulation and distribution of plastic zone during construction by three-dimensional finite difference.The results indicate: the maximum settlement of highway is less than that specified in specifications,the maximum vertical deformation of surrounding rock is 20 mm and it is 16 mm for the horizontal deformation,the extruded deformation in front of the working face is large with the max.value of 38 mm,it is obvious for the energy density concentration of side wall where is 5m away from the tunnel wall,energy accumulation occurs at the surrounding rock 6m ahead of working face,plastic zones predominantly are located at the front,shoulder,sidewall and foot.Therefore it is suggested the working face be reinforced to guarantee the reinforcement of tunnel foot and shoulder to improve the structure stability.
Based on the Yanshan tunnel underpassing highway on Zhangjiakou-Tangshan railway,it analyzes the characteristics of stratum deformation,mechanical response,energy accumulation and distribution of plastic zone during construction by three-dimensional finite difference.The results indicate: the maximum settlement of highway is less than that specified in specifications,the maximum vertical deformation of surrounding rock is 20 mm and it is 16 mm for the horizontal deformation,the extruded deformation in front of the working face is large with the max.value of 38 mm,it is obvious for the energy density concentration of side wall where is 5m away from the tunnel wall,energy accumulation occurs at the surrounding rock 6m ahead of working face,plastic zones predominantly are located at the front,shoulder,sidewall and foot.Therefore it is suggested the working face be reinforced to guarantee the reinforcement of tunnel foot and shoulder to improve the structure stability.
引文
[1]赵东平.小净距平行隧道下穿施工对多层建筑的影响研究[J].现代隧道技术,2011,48(5):30-38 Zhao Dongping.The Effects of Parallel Tunnel Construction with a Small Clear Distance on a Multistory Building[J].Modern Tunnelling Technology,2011,48(5):30-38
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[8]杨广武,关龙,刘军,等.盾构法隧道下穿既有结构三维数值模拟分析[J].中国铁道科学,2009,30(6):54-60 Yang Guangwu,Guan Long,Liu Jun,et al.Three-Dimensional Numerical Simulation Analysis of the Shield-Driven Tunnel Crossing under the Existing Structure[J].China Railway Science,2009,30(6):54-60
[9]孙坚,宋宏伟,王天春.隧道下穿对道路结构应力及沉降变形的影响研究[J].水利与建筑工程学报,2011,9(5):18-23 Sun Jian,Song Hongwei,Wang Tianchun.Study for Stress and Settlement Influence of Tunnel Piercing Underneath on Road Structure[J].Journal of Water Resources Architectural Engineering,2011,9(5):18-23
[10]朱永全,朱正国,黄松.隧道施工公路路面沉降规律和控制标准研究[J].北京工业大学学报,2011,37(9):1348-1353 Zhu Yongquan,Zhu Zhengguo,Huang Song.Study on Road Surface Subsidence Rule Due to Tunnel Construction and Control Standard[J].Journal of Beijing University of Technology,2011,37(9):1348-1353
[11]张广洋,李旭升,高波,等.行波激励下穿越断层隧道的地震响应分析[J].公路,2011(10):233-237 Zhang Guangyang,Li Xusheng,Gao Bo,et al.Seismic Response Analysis for Tunnel Crossing Fault Under Excitation of Traveling Waves[J].Highway,2011(10):233-237
[12]宁寅,冯伟,马永其,等.泥水盾构下穿已有隧道施工过程数值模拟研究[J].现代隧道技术,2011,48(5):63-69 Ning Yin,Feng Wei,Ma Yongqi,et al.Numerical Simulation of the Construction Process of a Slurry Balance Shield Traversing Under an Existing Tunnel[J].Modern Tunnelling Technology,2011,48(5):63-69
[2]李平,杨挺,刘汉龙,等.基坑开挖中既有下穿地铁隧道隆起变形分析[J].解放军理工大学学报(自然科学版),2011,12(5):480-485 Li Ping,Yang Ting,Liu Hanlong,et al.Heave Deformation of Existing Tunnels under New Tunnel Excavation[J].Journal of PLA University of Science and Technology(Natural Science Edition),2011,12(5):480-485
[3]霍军帅,王炳龙,周顺华.地铁盾构隧道下穿城际铁路地基加固方案安全性分析[J].中国铁道科学,2011,32(5):71-77 Huo Junshuai,Wang Binglong,Zhou Shunhua.Safety Analysis of Foundation Reinforcement Scheme for Shield Tunnel Under-Passing Intercity Railway[J].China Railway Science,2011,32(5):71-77
[4]崔光耀,王明年,路军富,等.客运专线机场路隧道下穿高架桥近接桩基施工位移控制技术[J].中国铁道科学,2011,32(3):68-73 Cui Guangyao,Wang Mingnian,Lu Junfu,et al.Adjacent Pile Foundation Construction Displacement Control Technology of Passenger Dedicated Line Jichang Road Tunnel Crossing under Viaducts[J].China Railway Science,2011,32(3):68-73
[5]李奎,高波.地铁隧道下穿小河和桥梁的施工方案研究[J].岩土力学,2010,31(5):1509-1516 Li Kui,Gao Bo.Study of Construction Schemes for Metro Tunnel Crossing River and Bridge[J].Rock and Soil Mechanics,2010,31(5):1509-1516
[6]汪洋,何川,曾东洋,等.盾构隧道正交下穿施工对既有隧道影响的模型试验与数值模拟[J].铁道学报,2010,32(2):79-85 Wang Yang,He Chuan,Zeng Dongyang,et al.Model Test and Numerical Simulation of Influence of Perpendicular Undercross Shield Tunnel Construction on Existing Tunnel[J].Journal of the China Railway Society,2010,32(2),79-85
[7]覃卫民,赵荣生,王浩,等.浅埋大跨隧道下穿建筑物的安全影响研究[J].岩石力学与工程学报,2010,29(A02):3762-3768 Qin Weimin,Zhao Rongsheng,Wang Hao,et al.Study of Building Safety during Shallow-Buried Large-Span Tunnel Underpassing[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(A02):3762-3768
[8]杨广武,关龙,刘军,等.盾构法隧道下穿既有结构三维数值模拟分析[J].中国铁道科学,2009,30(6):54-60 Yang Guangwu,Guan Long,Liu Jun,et al.Three-Dimensional Numerical Simulation Analysis of the Shield-Driven Tunnel Crossing under the Existing Structure[J].China Railway Science,2009,30(6):54-60
[9]孙坚,宋宏伟,王天春.隧道下穿对道路结构应力及沉降变形的影响研究[J].水利与建筑工程学报,2011,9(5):18-23 Sun Jian,Song Hongwei,Wang Tianchun.Study for Stress and Settlement Influence of Tunnel Piercing Underneath on Road Structure[J].Journal of Water Resources Architectural Engineering,2011,9(5):18-23
[10]朱永全,朱正国,黄松.隧道施工公路路面沉降规律和控制标准研究[J].北京工业大学学报,2011,37(9):1348-1353 Zhu Yongquan,Zhu Zhengguo,Huang Song.Study on Road Surface Subsidence Rule Due to Tunnel Construction and Control Standard[J].Journal of Beijing University of Technology,2011,37(9):1348-1353
[11]张广洋,李旭升,高波,等.行波激励下穿越断层隧道的地震响应分析[J].公路,2011(10):233-237 Zhang Guangyang,Li Xusheng,Gao Bo,et al.Seismic Response Analysis for Tunnel Crossing Fault Under Excitation of Traveling Waves[J].Highway,2011(10):233-237
[12]宁寅,冯伟,马永其,等.泥水盾构下穿已有隧道施工过程数值模拟研究[J].现代隧道技术,2011,48(5):63-69 Ning Yin,Feng Wei,Ma Yongqi,et al.Numerical Simulation of the Construction Process of a Slurry Balance Shield Traversing Under an Existing Tunnel[J].Modern Tunnelling Technology,2011,48(5):63-69
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