地铁隧道下卧土体动力特性模型试验研究
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摘要
研究目的:地铁车辆动荷载的长期作用会使隧道产生不同程度的沉降,对其运营稳定性产生不利的影响,对于饱和软土地层条件,隧道的沉降更为明显。开展动荷载作用下地铁隧道下卧土体的动力稳定性研究,有助于正确认识地铁运营荷载对周围土体的影响,并为隧道周围土体的加固提供依据。研究结论:通过分析盾构隧道的运营受力特征,设计了物理模拟试验系统,对地铁盾构隧道下卧粉质黏土的动力特性进行了研究,分析了不同荷载幅值、不同频率条件下隧道下卧粉质黏土的动力响应特性,并对动荷载作用下隧道的沉降特征进行了分析。试验结果表明,盾构隧道下卧粉质黏土在动荷载的作用下,土体的动力响应随距离的增加而衰减,且距离隧道越近衰减趋势越明显。动荷载峰值越大,隧道沉降越大;荷载峰值相同、振动次数一定时,荷载振动频率越低,隧道的竖向沉降越大。
Research purposes: The settlement of subway tunnel in different level will be caused under the long-time vehicle dynamic load and it brings unfavorable effects on the stability of subway operation.The settlement is clearer especially in the saturated soft clay.It will help us to correctly understand the subway operation load of the surrounding soil by carrying out soil dynamic stability research under subway tunnel and provide the basis for soil around tunnel reinforcement. Research conclusions: Based on the analysis of stress characteristic during subway operation,a simulated experimental system is researched and built up.This paper investigated the dynamic stability of underlying silty clay of shield tunnel by model test.The dynamic characteristic in different amplitude and frequency of dynamic load was researched,also we analyzed the settlement of the subway tunnel.The test results shows that,the dynamic response of underlying silty clay presented attenuation trend with the increasing of space,the attenuation was more obvious when the distance was smaller,and the larger the value of dynamic load peak,the greater the tunnel settlement.The lower frequency,the greater the vertical settlement when the dynamic load has the same value and the vibration frequency is constant.
Research purposes: The settlement of subway tunnel in different level will be caused under the long-time vehicle dynamic load and it brings unfavorable effects on the stability of subway operation.The settlement is clearer especially in the saturated soft clay.It will help us to correctly understand the subway operation load of the surrounding soil by carrying out soil dynamic stability research under subway tunnel and provide the basis for soil around tunnel reinforcement. Research conclusions: Based on the analysis of stress characteristic during subway operation,a simulated experimental system is researched and built up.This paper investigated the dynamic stability of underlying silty clay of shield tunnel by model test.The dynamic characteristic in different amplitude and frequency of dynamic load was researched,also we analyzed the settlement of the subway tunnel.The test results shows that,the dynamic response of underlying silty clay presented attenuation trend with the increasing of space,the attenuation was more obvious when the distance was smaller,and the larger the value of dynamic load peak,the greater the tunnel settlement.The lower frequency,the greater the vertical settlement when the dynamic load has the same value and the vibration frequency is constant.
引文
[1]白冰,李春峰.地铁列车振动作用下近距离平行隧道的弹塑性动力响应[J].岩土力学,2009(1):124-128.Bai Bing,Li Chunfeng.Elastoplastic DynamicResponses of Close Parallel Metro Tunnels to VibrationLoading[J].Rock and Soil Mechanics,2009(1):124-128.
[2]耿传智,廖志军.地铁振动衰减特性研究[J].同济大学学报(自然科学版),2009(3):344-348.Geng Chuanzhi,Liao Zhijun.Research on AttenuationCharacteristics of Subway Vibration[J].Journal ofTongji University(Natural Science),2009(3):344-348.
[3]张曦,唐益群,周念清,等.地铁振动荷载作用下隧道周围饱和软黏土动力响应研究[J].土木工程学报,2007(2):85-88.Zhang Xi,Tang Yiqun,Zhou Nianqing,etc.DynamicResponse of Saturated Soft Clay around a SubwayTunnel under Vibration Load[J].China CivilEngineering Journal,2007(2):85-88.
[4]高峰,关宝树,仇文革,等.列车荷载作用下地铁重叠隧道的响应分析[J].西南交通大学学报,2003(1):38-42.Gao Feng,Guan Baoshu,Qiu Wenge,etc.DynamicResponses of Overlapping Tunnels to Passing Trains[J].Journal of Southwest Jiaotong University,2003(1):38-42.
[5]邓飞皇,莫海鸿,曾庆军.地铁运行振动诱发地层和地表动力响应分析[J].科学技术与工程,2007(3):348-351.Deng Feihuang,Mo Haihong,Zeng Qingjun.Analysisof Dynamic Response of Stratum and Ground Inducedby Metro Operating[J].Science Technology andEngineering,2007(3):348-351.
[6]宫全美,徐勇,周顺华.地铁运行荷载引起的隧道地基土动力响应分析[J].中国铁道科学,2005(5):47-51.Gong Quanmei,Xu Yong,Zhou Shunhua.DynamicResponse Analysis of Tunnel Foundation by Vehicle inMetro[J].China Railway Science,2005(5):47-51.
[7]张长泰,张玉芳.饱和砂土中的地铁圆形衬砌隧道地震响应分析[J].铁道工程学报,2008(1):76-80.Zhang Changtai,Zhang Yufang.Analysis of SeismicResponse to the Metro Tunnel in Saturated Sand-soilArea[J].Journal of Railway Engineering Society,2008(1):76-80.
[8]崔广心.相似理论与模型试验[M].徐州:中国矿业大学出版社,1990.Cui Guangxin.Similitude Principle and Simulated Test[M].Xuzhou:China University of Mining andTechnology Press,1990.
[9]徐挺.相似方法及其应用[M].北京:机械工业出版社,1995.Xu Ting.Similarity Method and Its Application[M].Beijing:Machinery Industry Press,1995.
[2]耿传智,廖志军.地铁振动衰减特性研究[J].同济大学学报(自然科学版),2009(3):344-348.Geng Chuanzhi,Liao Zhijun.Research on AttenuationCharacteristics of Subway Vibration[J].Journal ofTongji University(Natural Science),2009(3):344-348.
[3]张曦,唐益群,周念清,等.地铁振动荷载作用下隧道周围饱和软黏土动力响应研究[J].土木工程学报,2007(2):85-88.Zhang Xi,Tang Yiqun,Zhou Nianqing,etc.DynamicResponse of Saturated Soft Clay around a SubwayTunnel under Vibration Load[J].China CivilEngineering Journal,2007(2):85-88.
[4]高峰,关宝树,仇文革,等.列车荷载作用下地铁重叠隧道的响应分析[J].西南交通大学学报,2003(1):38-42.Gao Feng,Guan Baoshu,Qiu Wenge,etc.DynamicResponses of Overlapping Tunnels to Passing Trains[J].Journal of Southwest Jiaotong University,2003(1):38-42.
[5]邓飞皇,莫海鸿,曾庆军.地铁运行振动诱发地层和地表动力响应分析[J].科学技术与工程,2007(3):348-351.Deng Feihuang,Mo Haihong,Zeng Qingjun.Analysisof Dynamic Response of Stratum and Ground Inducedby Metro Operating[J].Science Technology andEngineering,2007(3):348-351.
[6]宫全美,徐勇,周顺华.地铁运行荷载引起的隧道地基土动力响应分析[J].中国铁道科学,2005(5):47-51.Gong Quanmei,Xu Yong,Zhou Shunhua.DynamicResponse Analysis of Tunnel Foundation by Vehicle inMetro[J].China Railway Science,2005(5):47-51.
[7]张长泰,张玉芳.饱和砂土中的地铁圆形衬砌隧道地震响应分析[J].铁道工程学报,2008(1):76-80.Zhang Changtai,Zhang Yufang.Analysis of SeismicResponse to the Metro Tunnel in Saturated Sand-soilArea[J].Journal of Railway Engineering Society,2008(1):76-80.
[8]崔广心.相似理论与模型试验[M].徐州:中国矿业大学出版社,1990.Cui Guangxin.Similitude Principle and Simulated Test[M].Xuzhou:China University of Mining andTechnology Press,1990.
[9]徐挺.相似方法及其应用[M].北京:机械工业出版社,1995.Xu Ting.Similarity Method and Its Application[M].Beijing:Machinery Industry Press,1995.
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