轨道交通单排非连续隔振屏障隔振效果模型试验研究
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摘要
为了研究轨道交通隔振屏障中的非连续隔振屏障的隔振效果,通过进行隔振井(空井、PVC空井)及混凝土桩(实心桩、空心桩)的室内模型试验,以地表振动加速度级为评价指标,对上述非连续隔振屏障的隔振效果给出了评价,进一步对空心混凝土桩的隔振效果进行了分析。结果表明:高频振动波衰减迅速,中低频振动波是引起土体振动的主要原因;混凝土桩隔振性能优于隔振井,具体隔振效果比较为:混凝土桩>空心混凝土桩>空井≈PVC空井;对于空心混凝土桩,桩体的空心率越大,隔振性能相对越差;桩体外截面为圆形的空心混凝土桩的隔振效果大于方形;截面内部形状对隔振效果影响较小;空心混凝土桩内填充松散橡胶颗粒、泡沫等阻尼材料无法进一步提高空心桩隔振性能;若填充原场土,填土密度对其隔振性能没有影响。
In order to study vibration isolation effects of rail transit 's discontinuous barriers,taking vibration acceleration of ground surface as the evaluation index,a series of indoor model tests were conducted for vibration isolation wells including empty wells and PVC ones,and concrete piles including solid piles and hollow ones,then the vibration isolation effect of the above mentioned discontinuous barriers were evaluated. Further,the vibration isolation effect of hollow concrete piles was evaluated. Results showed that vibration waves with higher frequencies decay rapidly,medium frequency and lower frequency waves are the main reason to cause soil body vibration; the vibration isolation performance of concrete piles is better than that of vibration isolation wells be; the vibration isolation effect of solid piles that of hollow piles that of empty wells or PVC ones; for hollow piles,the larger the hollow ratio,the worse the vibration isolation performance; the vibration isolation performance of cylindrical hollow piles is bigger than that of square hollow ones,the internal shape of hollow cross-section has little influence on the vibration isolation effect; hollow concrete piles filled with loose rubber particles,foam and other damping materials can't improve their vibration isolation performance; if they are filled with raw soil,the fill density has no influence on their vibration isolation performance.
In order to study vibration isolation effects of rail transit 's discontinuous barriers,taking vibration acceleration of ground surface as the evaluation index,a series of indoor model tests were conducted for vibration isolation wells including empty wells and PVC ones,and concrete piles including solid piles and hollow ones,then the vibration isolation effect of the above mentioned discontinuous barriers were evaluated. Further,the vibration isolation effect of hollow concrete piles was evaluated. Results showed that vibration waves with higher frequencies decay rapidly,medium frequency and lower frequency waves are the main reason to cause soil body vibration; the vibration isolation performance of concrete piles is better than that of vibration isolation wells be; the vibration isolation effect of solid piles that of hollow piles that of empty wells or PVC ones; for hollow piles,the larger the hollow ratio,the worse the vibration isolation performance; the vibration isolation performance of cylindrical hollow piles is bigger than that of square hollow ones,the internal shape of hollow cross-section has little influence on the vibration isolation effect; hollow concrete piles filled with loose rubber particles,foam and other damping materials can't improve their vibration isolation performance; if they are filled with raw soil,the fill density has no influence on their vibration isolation performance.
引文
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[17]孙雨明.铁路交通产生的地面振动与排桩隔振[D].上海:同济大学,2003.
[18]国家环境保护局.城市区域环境振动测量方法:GB/T10071—1988[S].北京:中国标准出版社,1989.
[19]万胜国,梁晖,周华杰,等.地铁运行引起环境振动的评价方法[J].武汉工程大学学报,2009,31(5):25-28.WAN Shengguo,LIANG Hui,ZHOU Huajie,et al.Study on evaluation approach of subway-induced environmental vibration[J].Journal of Wuhan Institute of Technology,2009,31(5):25-28.
[20]谢定义.土动力学[D].北京:高等教育出版社,2011.
[2]CELEBI E,SCHMID G.Investigation of ground vibrations induced by moving loads[J].Engineering Structure,2005,27(14):1981-1998.
[3]KATTIS S E,POLYZOS D,BESKOS D E.Vibration isolation by a row of piles using a 3-D frequency domain BEM[J].Int J Numer Meth Eeg,1999,46(7):13-28.
[4]冯青松,雷晓燕.基于2.5维有限元-边界元分析轨道随机不平顺影响下的铁路地基振动[J].振动与冲击,2013,32(23):13-19.FENG Qingsong,LEI Xiaoyan.Railway ground vibration with track random irregularities based on 2.5D finite elementboundary element method[J].Journal of Vibration and Shock,2013,32(23):13-19.
[5]冯青松,成功,雷晓燕,等.有砟与板式无砟轨道结构对高速铁路地基振动的影响分析[J].振动与冲击,2015,34(24):153-159.FENG Qingsong,CHENG Gong,LEI Xiaoyan,et al.Influences of ballasted track and slab ballastless track structures on ground vibration of high speed railway[J].Journal of Vibration and Shock,2015,34(24):153-159.
[6]刘卫丰,刘维宁,DEGRANDE G,等.地铁列车运行引起地表振动的预测模型及其试验验证[J].振动工程学报,2010,23(4):373-379.LIU Weifeng,LIU Weining,DEGRANDE G,et al.Experimental validation of a numerical model for prediction of metro train-induced ground-surface vibration[J].Journal of Vibration Engineering,2010,23(4):373-379.
[7]杨新文,和振兴.梯形轨枕轨道振动特性研究[J].振动工程学报,2012,25(4):388-393.YANG Xinwen,HE Zhenxing.Vibration characteristics of ladder sleeper track[J].Journal of Vibration Engineering,2012,25(4):388-393.
[8]张鹏飞,雷晓燕,高亮,等.铁路环境振动对厂房内精密仪器的影响分析[J].振动与冲击,2013,32(16):187-192.ZHANG Pengfei,LEI Xiaoyan,GAO Liang,et al.Effect of railway environment vibration on precision instruments inside the plant[J].Journal of Vibration Engineering,2013,32(16):187-192.
[9]洪俊青,刘伟庆,王曙光,等.城市轨道交通临近建筑的隔振分析[J].振动与冲击,2008,27(11):37-41.HONG Junqing,LIU Weiqing,WANG Shuguang,et al.Vibration analysis of base-isolated building near urban rail transit[J].Journal of Vibration Engineering,2008,27(11):37-41.
[10]姚锦宝,夏禾,张楠,等.考虑土-结构相互作用的列车引起建筑物及地面振动分析[J].铁道学报,2014(4):93-98.YAO Jinbao,XIA He,ZHANG Nan,et al.Numerical analysis on building and soil vibrations induced by moving trains considering dynamic soil-structure[J].Journal of the China Railway Society,2014(4):93-98.
[11]陈昆,贾霄,刘彬,等.高速铁路空沟隔振屏障隔振效果的有限元分析[J].地震工程学报,2014(3):575-579.CHEN Kun,JIA Xiao,LIU Bin,et al.Finite element analysis of reducing the high-speed railway vibration effect on the environment using open trenches[J].China Earthquake Engineering Journal,2014(3):575-579.
[12]冯桂帅,刘晶磊,张瑞恒,等.填料性质对砂土填充沟隔振效果的影响试验研究[J].铁道建筑,2017(2):151-155.FENG Guishuai,LIU Jinglei,ZHANG Ruiheng,et al.Experimental research for influence of filling properties on vibration isolation effect of sand-filled trench[J].Railway Engineering,2017(2):151-155.
[13]张雷刚,刘晶磊,侯恩品,等.铁路路基填充屏障隔振效果的模型试验研究[J].铁道建筑,2017(4):146-150.ZHANG Leigang,LIU Jinglei,HOU Enpin,et al.Model test research on vibration isolation effects of filling barriers for railway subgrade[J].Railway Engineering,2017(4):146-150.
[14]王书卫.钢轨扣件减振橡胶阻尼耗能特性分析[J].铁道标准设计,2015(1):37-41.WANG Shuwei.Analysis of structural damping property of rail fastening rubber absorber[J].Railway Standard Design,2015(1):37-41.
[15]孟鑫,刘鹏辉,姚京川,等.重载铁路振动对沿线建筑物结构影响试验[J].噪声与振动控制,2015(2):101-106.MENG Xin,LIU Penghui,YAO Jingchuan,et al.Experimental study on ambient building damage caused by heavy-haul railway operation[J].Noise and Vibration Control,2015(2):101-106.
[16]张鲲鹏,陈哲武.结构试验相似理论研究及实例分析[J].低温建筑技术,2015,37(7):42-45.ZHANG Kunpeng,CHEN Zhewu.The research and the application analysis of similarity theory in tests of civil engineering structure[J].Low Temperature Architecture Technology,2015,37(7):42-45.
[17]孙雨明.铁路交通产生的地面振动与排桩隔振[D].上海:同济大学,2003.
[18]国家环境保护局.城市区域环境振动测量方法:GB/T10071—1988[S].北京:中国标准出版社,1989.
[19]万胜国,梁晖,周华杰,等.地铁运行引起环境振动的评价方法[J].武汉工程大学学报,2009,31(5):25-28.WAN Shengguo,LIANG Hui,ZHOU Huajie,et al.Study on evaluation approach of subway-induced environmental vibration[J].Journal of Wuhan Institute of Technology,2009,31(5):25-28.
[20]谢定义.土动力学[D].北京:高等教育出版社,2011.