列车振动荷载作用下某岩质边坡应力应变动力响应分析
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摘要
以某高速铁路隧道进口边坡为研究对象,采用FLAC3D软件分析了列车振动荷载对该边坡岩体的应力、变形及稳定性的影响。数值模拟结果显示,在列车振动荷载作用下,隧道两侧及底部最大、最小主应力均产生集中现象,最大主应力较自重应力场下增加1～2MPa,最小主应力较自重应力场下增加0.5～1MPa;隧道顶部最大、最小主应力均与自重应力场下基本一致;隧道进口边坡总位移增量最大值区域主要分布在边坡顶部及隧道正上方坡顶区域,自坡顶往坡底总位移增量逐渐减小,最大总位移增量约为2.15cm;列车振动荷载将在边坡内地层分界面附近、软弱夹层内、构造结构面附近、开挖面附近形成剪应变增量带,对边坡的稳定性极为不利。
This article analyzed the stress,deformation and stability of a tunnel entrance slope under train vibration load by FLAC3D.Numerical simulation results show that the maximum and minimum principal stress will concentrate at both the tunnel sides and the bottom of the tunnel,and the increscent of maximum principal stress caused by train vibration load is 1～2MPa,and the increscent of minimum principal stress is 0.5～1MPa.The maximum and minimum principal stresses are almost the same as they were located in self-weight stress field.The maximum total displacement increment region mainly distributes in the top of the slope and the top just above the tunnel,the total displacement increment decreases from the top to the foot of the hill,and the maximum total displacement increment is about 2.15cm.Shear strain increment zone may appear near the interface of layers,in soft layers,and near the structure planes and excavation surface,which is an extremely unfavorable thing to the stability of the slope.
This article analyzed the stress,deformation and stability of a tunnel entrance slope under train vibration load by FLAC3D.Numerical simulation results show that the maximum and minimum principal stress will concentrate at both the tunnel sides and the bottom of the tunnel,and the increscent of maximum principal stress caused by train vibration load is 1～2MPa,and the increscent of minimum principal stress is 0.5～1MPa.The maximum and minimum principal stresses are almost the same as they were located in self-weight stress field.The maximum total displacement increment region mainly distributes in the top of the slope and the top just above the tunnel,the total displacement increment decreases from the top to the foot of the hill,and the maximum total displacement increment is about 2.15cm.Shear strain increment zone may appear near the interface of layers,in soft layers,and near the structure planes and excavation surface,which is an extremely unfavorable thing to the stability of the slope.
引文
[1]李华东.某高速铁路隧道入口边坡变形破坏机制及稳定性分析[D].成都:成都理工大学,2010.[LI HD.Deformation-failure mechanisms and stabilityanalysis of a high-speed railway tunnel entranceslope[D].Chengdu:Chengdu University oftechnology,2010.(in Chinese)]
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[3]金亮星,张家生,聂志红.高速铁路振动荷载时程的动力反分析[J].交通运输工程学报,2005,5(1):36-38.[JIN L X,ZHANG J S,NIE Z H.Dynamic inverse analysis for vibration-load history ofhigh-speed railway[J].Journal of Traffic andTransportation Engineering,2005,5(1):36-38.(inChinese)]
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[6]杨龙才,郭庆海,周顺华,等.高速铁路桥桩在轴向循环荷载长期作用下的承载和变形特性试验研究.[J].岩石力学与工程学报,2005,24(13):2362-2368.[YANG L C,GUO Q H,ZHOU S H,et al.Dynamic behaviors of pile foundation of high-speedrailway bridge under long-term cyclic loading in softsoil[J].Chinese Journal of Rock Mechanics andEngineering,2005,24(13):2362-2368.(inChinese)]
[7]张玉娥,白宝鸿.地铁列车振动对隧道结构激振荷载的模拟[J].振动与冲击,2000,19(3):68-71.[ZHANG Y E,BAI B H.The method of identifyingtrain vibration load acting on subway tunnel structure[J].Journal of Vibration and Shock,2000,19(3):68-71.(in Chinese)]
[8]高峰,关宝树,潘昌实.沉管隧道在列车振动作用下受力状态的研究[C]//第九届全国结构工程学术会议论文集(Ⅱ),2000:734-738.[GAO F,GUANB S,PAN C S.Stress state of immersed tube tunnelunder the train vibration[C]//Proceedings of theNinth National Conference on Structural Engineering(Ⅱ),2000:734-738.(in Chinese)]
[9]李亮,张丙强,杨小礼.高速列车振动荷载下大断面隧道结构动力响应分析[J].岩石力学与工程学报,2005,24(23):4259-4265.[LI L,ZHANG B Q,YANG X L.Analysis of dynamic response of largecross-section tunnel under vibrating load induced byhigh speed train[J].Chinese Journal of RockMechanics and Engineering,2005,24(23):4259-4265.(in Chinese)]
[10]刘维宁,夏禾,郭文军.地铁列车振动的环境响应[J].岩石力学与工程学报,1996,15(S1):586-593.[LIU W N,XIA H,GUO W J.Study ofvibration effects of trains on surrounding environments[J].Chinese Journal of Rock Mechanics andEngineering,1996,15(S1):586-593.(in Chinese)]
[11]王常晶,陈云敏.列车移动荷载产生的地面振动测试与分析[C]//第一届全国环境岩土工程与土工合成材料技术研讨会论文集,2002.[WANG C J,CHEN Y M.Ground vibration test and analysisgenerated by moving train load[C]//Proceedings ofthe First National Conference on EnvironmentalGeotechnical Engineering and GeosyntheticsTechnology,2002.(in Chinese)]
[12]刘春玲,祁生文,童立强,等.利用FLAC3D分析某边坡地震稳定性[J].岩石力学与工程学报,2004,23(16):2730-2733.[LIU C L,QI S W,TONG LQ,et al.Stability analysis of slope under earthquakewith FLAC3D[J].Chinese Journal of Rock Mechanicsand Engineering,2004,23(16):2730-2733.(inChinese)]
[13]丁秀美.西南地区复杂环境下典型堆积(填)体斜坡变形及稳定性研究[D].成都:成都理工大学,2005.[DING X M.A Study on the Deformation andStability of Representative Debris&Embankment Slopewith Complicated Environment in Southwestern China[D].Chengdu:Chengdu University of technology,2005.(in Chinese)]
[2]潘昌实,Pande G N.黄土隧道列车动荷载响应有限元初步数定分析研究[J].土木工程学报,1984,17(4):19-28.[PAN C S,Pande G N.Preliminarydeterministic finite element study on a tunnel driven inloess subjected to train loading[J].China CivilEngineering Journal,1984,17(4):19-28.(inChinese)]
[3]金亮星,张家生,聂志红.高速铁路振动荷载时程的动力反分析[J].交通运输工程学报,2005,5(1):36-38.[JIN L X,ZHANG J S,NIE Z H.Dynamic inverse analysis for vibration-load history ofhigh-speed railway[J].Journal of Traffic andTransportation Engineering,2005,5(1):36-38.(inChinese)]
[4]许俊超,童小东,潘卫东.高速铁路路基结构的动力有限元分析[J].路基工程,2006(5):20-22.[XUJ C,TONG X D,PAN W D.Dynamic finite elementanalysis of high-speed railway subgrade[J].Subgrade Engineering,2006(5):20-22.(inChinese)]
[5]李军世,李克钏.高速铁路路基动力反应的有限元分析[J].铁道学报,1995,17(1):66-75.[LI J S,LI K C.Finite element analysis for dynamic responseof roadbed of high-speed railway[J].Journal of theChina Railway Society,1995,17(1):66-75.(inChinese)]
[6]杨龙才,郭庆海,周顺华,等.高速铁路桥桩在轴向循环荷载长期作用下的承载和变形特性试验研究.[J].岩石力学与工程学报,2005,24(13):2362-2368.[YANG L C,GUO Q H,ZHOU S H,et al.Dynamic behaviors of pile foundation of high-speedrailway bridge under long-term cyclic loading in softsoil[J].Chinese Journal of Rock Mechanics andEngineering,2005,24(13):2362-2368.(inChinese)]
[7]张玉娥,白宝鸿.地铁列车振动对隧道结构激振荷载的模拟[J].振动与冲击,2000,19(3):68-71.[ZHANG Y E,BAI B H.The method of identifyingtrain vibration load acting on subway tunnel structure[J].Journal of Vibration and Shock,2000,19(3):68-71.(in Chinese)]
[8]高峰,关宝树,潘昌实.沉管隧道在列车振动作用下受力状态的研究[C]//第九届全国结构工程学术会议论文集(Ⅱ),2000:734-738.[GAO F,GUANB S,PAN C S.Stress state of immersed tube tunnelunder the train vibration[C]//Proceedings of theNinth National Conference on Structural Engineering(Ⅱ),2000:734-738.(in Chinese)]
[9]李亮,张丙强,杨小礼.高速列车振动荷载下大断面隧道结构动力响应分析[J].岩石力学与工程学报,2005,24(23):4259-4265.[LI L,ZHANG B Q,YANG X L.Analysis of dynamic response of largecross-section tunnel under vibrating load induced byhigh speed train[J].Chinese Journal of RockMechanics and Engineering,2005,24(23):4259-4265.(in Chinese)]
[10]刘维宁,夏禾,郭文军.地铁列车振动的环境响应[J].岩石力学与工程学报,1996,15(S1):586-593.[LIU W N,XIA H,GUO W J.Study ofvibration effects of trains on surrounding environments[J].Chinese Journal of Rock Mechanics andEngineering,1996,15(S1):586-593.(in Chinese)]
[11]王常晶,陈云敏.列车移动荷载产生的地面振动测试与分析[C]//第一届全国环境岩土工程与土工合成材料技术研讨会论文集,2002.[WANG C J,CHEN Y M.Ground vibration test and analysisgenerated by moving train load[C]//Proceedings ofthe First National Conference on EnvironmentalGeotechnical Engineering and GeosyntheticsTechnology,2002.(in Chinese)]
[12]刘春玲,祁生文,童立强,等.利用FLAC3D分析某边坡地震稳定性[J].岩石力学与工程学报,2004,23(16):2730-2733.[LIU C L,QI S W,TONG LQ,et al.Stability analysis of slope under earthquakewith FLAC3D[J].Chinese Journal of Rock Mechanicsand Engineering,2004,23(16):2730-2733.(inChinese)]
[13]丁秀美.西南地区复杂环境下典型堆积(填)体斜坡变形及稳定性研究[D].成都:成都理工大学,2005.[DING X M.A Study on the Deformation andStability of Representative Debris&Embankment Slopewith Complicated Environment in Southwestern China[D].Chengdu:Chengdu University of technology,2005.(in Chinese)]
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