基于不同固结度下地铁运营引起的地基土动力响应分析
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摘要
地铁运营时,地基土会在列车荷载-轨道系统相互作用下产生扰动。基于此,文章建立了列车荷载竖向振动模型,计算得到了地铁隧道仰拱处的荷载随时间的变化规律;并采用三维有限元法分析了受施工影响下杭州地铁1号线某区间列车运行引起的地基土振动响应。结果表明:随着地表土体与隧道中心线距离增大,地表振动出现滞后性,且强度逐渐减弱;隧道纵轴线上,位于隧道上、下方不同深度处地基土的振动规律具有一定的差异;初始固结度越小,地表的振动响应越大,而隧道下方的土体受施工扰动的影响则较小。考虑地铁施工的扰动影响对合理分析地铁运营期间的环境振动具有重要意义。
During metro operation, soil disturbance occurs due to interaction of the train load and the track system.A vertical vibration model of the train load is established, and the law of load varying with time at the tunnel invertis calculated. The vibration response of the foundation soil to a train running on the Hangzhou Metro line 1 underconstruction effect is analyzed using three-dimensional FEM. The results show that: 1) ground surface vibration lagsand vibration strength decreases gradually with an increase of distance between the surface soil mass and the tunnelcentral line; 2) on the tunnel′s longitudinal axis, the vibration laws of foundation soils above and below the tunnelhave certain differences; and 3) the smaller the initial consolidation degree, the larger the ground surface vibrationresponse, while the soil mass underneath the tunnel is affected slightly by construction disturbance. It is significantto consider the effects of metro construction disturbance in order to rationally analyze environmental vibrations duringmetro operation.
During metro operation, soil disturbance occurs due to interaction of the train load and the track system.A vertical vibration model of the train load is established, and the law of load varying with time at the tunnel invertis calculated. The vibration response of the foundation soil to a train running on the Hangzhou Metro line 1 underconstruction effect is analyzed using three-dimensional FEM. The results show that: 1) ground surface vibration lagsand vibration strength decreases gradually with an increase of distance between the surface soil mass and the tunnelcentral line; 2) on the tunnel′s longitudinal axis, the vibration laws of foundation soils above and below the tunnelhave certain differences; and 3) the smaller the initial consolidation degree, the larger the ground surface vibrationresponse, while the soil mass underneath the tunnel is affected slightly by construction disturbance. It is significantto consider the effects of metro construction disturbance in order to rationally analyze environmental vibrations duringmetro operation.
引文
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[10]魏新江,张涛,丁智,等.循环荷载下不同固结度饱和软黏土刚度变化试验研究[J].岩土工程学报,2013,35(S):675-679.WEI Xinjiang,ZHANG Tao,DING Zhi,et al.Experimental Study on Stiffness Changing of Saturated Soft Clay with Different De-gree of Consolidation under Cyclic Loading[J].Chinese Journal of Geotechnical Engineering,2013,35(S):675-679.
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[12]魏新江,张孟雅,丁智,等.初始固结度影响下地铁运营引起的长期沉降预测[J].现代隧道技术,2016,53(2):114-120.WEI Xinjiang,ZHANG Mengya,DING Zhi,et al.Prediction of Long-Term Settlement Caused by Subway Operation under the In-fluence of Intitial Consolidation[J].Modern Tunnelling Technology,2016,53(2):114-120.
[13]丁智,葛国宝,魏新江,等.地铁列车运营引起的地基土应力状态变化分析与研究[J].岩土工程学报,2013,35(S2):647-651.DING Zhi,GE Guobao,WEI Xinjiang,et al.Variation of Stress State of Foundation Soils Induced by Running Subway[J].ChineseJournal of Geotechnical Engineering,2013,35(S2):647-651.
[14]孙常新,刘桂香.改进振动法在地下工程动力时程计算中的应用[J].现代隧道技术,2013,50(3):66-71+78.SUN Changxin,LIU Guixiang.Application of the Improved Vibration Method to Dynamic Time-history Calculations for Under-ground Works[J].Modern Tunnelling Technology,2013,50(3):66-71+78.
[15]张玉红,陈茂庆,汤卓文,等.地铁列车运行的环境振动影响分析(I)——场地时域振动分析[J].佛山科学技术学院学报(自然科学版),2009,27(3):41-44.ZHANG Yuhong,CHEN Maoqing,TANG Zhuowen,et al.Influence Analysis of Vibration Induced by Moving Subway Train(I):theVibration Analysis of Soil in the Domain Time[J].Journal of Foshan University(Natural Science Edition),2009,27(3):41-44.
[2]潘昌实,李德武,谢正光.北京地铁列车振动对环境影响的探讨[J].振动与冲击,1995,14(4):29-34.PAN Changshi,LI Dewu,XIE Zhenguang.Vibration Effects of Beijing Subway Traffic on Environment[J].Journal of Vibration andShock,1995,14(4):29-34.
[3]张玉娥,潘昌实.地铁区间隧道列车振动响应测试与数值分析[J].石家庄铁道学院院报,1993,6(2):7-14.ZHANG Yu′e,PAN Changshi.Tests and Analyses of the Dynamic Response of Tunnels Subjected to Passing Train Load[J].Journalof Shijiazhuang Railway Institute,1993,6(2):7-14.
[4]王田友,丁洁民,楼梦麟.地铁运行引起场地振动的荷载与分析方法[J].工程力学,2010,27(1):195-201.WANG Tianyou,DING Jiemin,LOU Menglin.Load for Subway-induced Free Field Vibration and Analysis Method[J].EngineeringMechanics,2010,27(1):195-201.
[5]刘维宁,夏禾,郭文君.地铁列车振动的环境响应[J].岩石力学与工程学报,1996,15:586-593.LIU Weining,XIA He,GUO Wenjun.Study of Vibration Effects of Underground Trains on Surrounding Environments[J].ChineseJournal of Rock Mechanics and Engineering,1996,(15):586-593.
[6]单滔滔,楼梦麟,蒋通,等.地铁诱发地面振动传播衰减特性分析[J].防灾减灾工程学报,2013,33(4):461-467.SHAN Taotao,LOU Menglin,JIANG Tong,et al.Analysis on Propagation Attenuation of Subway-induced Ground Vibrations[J].Journal of Disaster Prevention and Mitigation Engineering,2013,33(4):461-467.
[7]王鑫,韩煊,周宏磊.黄土地区地铁行车荷载作用下地表响应的数值计算研究[J].现代隧道技术,2014,51(3):152-160.WANG Xin,HAN Xuan,ZHOU Honglei.Study of the Numerical Calculation of Ground Response under Metro Traffic Loading in aLoess Area[J].Modern Tunnelling Technology,2014,51(3):152-160.
[8]严涛,肖新标,金学松,等.地铁列车运行引起的环境振动三维数值分析[J].铁道建筑,2010,(7):67-70.YAN Tao,XIAO Xinbiao,JIN Xuesong,et al.Three-dimensional Numerical Analysis of Environment Vibration Induced by MetroTrain Operating[J].Railway Engineering,2010,(7):67-70.
[9]刘卫丰,刘维宁,GUPTAS,DEGRANDE G.地铁列车运行引起的隧道和自由场的动力响应预测[J].工程力学,2010,27(1):250-256.LIU Weifeng,LIU Weining,GUPTAS,DEGRANDE G.Prediction of Vibrations in the Tunnel and Free Field due to Passing of Met-ro Trains[J].Engineering Mechanics,2010,27(1):250-256.
[10]魏新江,张涛,丁智,等.循环荷载下不同固结度饱和软黏土刚度变化试验研究[J].岩土工程学报,2013,35(S):675-679.WEI Xinjiang,ZHANG Tao,DING Zhi,et al.Experimental Study on Stiffness Changing of Saturated Soft Clay with Different De-gree of Consolidation under Cyclic Loading[J].Chinese Journal of Geotechnical Engineering,2013,35(S):675-679.
[11]魏新江,张涛,丁智,等.地铁荷载下不同固结度软黏土的孔压试验模型[J].岩土力学,2014,35(10):2761-2768.WEI Xinjiang,ZHANG Tao,DING Zhi,et al.Experimental Study of Pore Pressure Model of Soft Clay with Different ConsolidationDegrees under Subway Loading[J].Rock and Soil Mechanics,2014,35(10):2761-2768.
[12]魏新江,张孟雅,丁智,等.初始固结度影响下地铁运营引起的长期沉降预测[J].现代隧道技术,2016,53(2):114-120.WEI Xinjiang,ZHANG Mengya,DING Zhi,et al.Prediction of Long-Term Settlement Caused by Subway Operation under the In-fluence of Intitial Consolidation[J].Modern Tunnelling Technology,2016,53(2):114-120.
[13]丁智,葛国宝,魏新江,等.地铁列车运营引起的地基土应力状态变化分析与研究[J].岩土工程学报,2013,35(S2):647-651.DING Zhi,GE Guobao,WEI Xinjiang,et al.Variation of Stress State of Foundation Soils Induced by Running Subway[J].ChineseJournal of Geotechnical Engineering,2013,35(S2):647-651.
[14]孙常新,刘桂香.改进振动法在地下工程动力时程计算中的应用[J].现代隧道技术,2013,50(3):66-71+78.SUN Changxin,LIU Guixiang.Application of the Improved Vibration Method to Dynamic Time-history Calculations for Under-ground Works[J].Modern Tunnelling Technology,2013,50(3):66-71+78.
[15]张玉红,陈茂庆,汤卓文,等.地铁列车运行的环境振动影响分析(I)——场地时域振动分析[J].佛山科学技术学院学报(自然科学版),2009,27(3):41-44.ZHANG Yuhong,CHEN Maoqing,TANG Zhuowen,et al.Influence Analysis of Vibration Induced by Moving Subway Train(I):theVibration Analysis of Soil in the Domain Time[J].Journal of Foshan University(Natural Science Edition),2009,27(3):41-44.