黏弹阻尼道床阻尼厚度对隧道及地表振动衰减特性的模拟研究
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摘要
为探究黏弹阻尼道床阻尼厚度对隧道及地表振动衰减特性的影响,为工程设计提供理论支持。利用ANSYS建立土体-隧道-道床平面有限元模型,分析在5～25 Hz频率荷载的作用下,整体道床和黏弹阻尼道床在隧道结构中的振动响应,并分析这两种道床下地表距离隧道中心线不同距离的振动加速度的衰减特性。结果表明:荷载频率小于10 Hz时,在地表距离隧道中心25 m左右,振动有明显的放大区域;荷载频率为10～20 Hz,振动加速度随道床阻尼层厚度降低,阻尼层越厚振动衰减越明显;随着黏弹阻尼道床阻尼层厚度增加,隧道衬砌底部振动加速度有效值依次降低,隧道壁竖直方向振动衰减更加明显,阻尼层每增加2 mm,振级降低1～4 d B。
This paper investigates the effect of damping thickness of viscoelastic damping track bed on the attenuation characteristics of tunnel and surface vibration,and provides theoretical support for engineering design.The plane finite element model of soil-tunnel-track bed is established by using ANSYS.The vibration response of the monolithic track and viscoelastic damping track in the tunnel structure under the frequency load of 5～25 Hz is analyzed,and the attenuation characteristics of the vibration acceleration at different distances from the tunnel centerline under the two tracks are analyzed.The results show that when the load frequency is less than 10 Hz and the surface of the tunnel is about 25 m away from the center of the tunnel,the vibration extends obviously to enlarged area.At the loading frequency of 10～20 Hz,the vibration acceleration decreases with the thickness of the bed damping layer,and the thicker the damping layer,the more obvious attenuation of vibration.As the thickness of the damping layer of the viscoelastic damping bed increases,the effective value of the vibration acceleration of the bottom of the tunnel lining decreases,and the vibration attenuation in the vertical direction of the tunnel wall becomes more obvious.For each 2 mm increase of the damping layer,the vibration level is reduced by 1～4 dB.
This paper investigates the effect of damping thickness of viscoelastic damping track bed on the attenuation characteristics of tunnel and surface vibration,and provides theoretical support for engineering design.The plane finite element model of soil-tunnel-track bed is established by using ANSYS.The vibration response of the monolithic track and viscoelastic damping track in the tunnel structure under the frequency load of 5～25 Hz is analyzed,and the attenuation characteristics of the vibration acceleration at different distances from the tunnel centerline under the two tracks are analyzed.The results show that when the load frequency is less than 10 Hz and the surface of the tunnel is about 25 m away from the center of the tunnel,the vibration extends obviously to enlarged area.At the loading frequency of 10～20 Hz,the vibration acceleration decreases with the thickness of the bed damping layer,and the thicker the damping layer,the more obvious attenuation of vibration.As the thickness of the damping layer of the viscoelastic damping bed increases,the effective value of the vibration acceleration of the bottom of the tunnel lining decreases,and the vibration attenuation in the vertical direction of the tunnel wall becomes more obvious.For each 2 mm increase of the damping layer,the vibration level is reduced by 1～4 dB.
引文
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[18]马蒙.基于敏感度的地铁列车振动环境影响预测及动态评价体系研究[D].北京:北京交通大学,2012.
[19]闫维明,聂晗,任珉,等.地铁交通引起地面振动的实测与分析[J].铁道科学与工程学报,2006,3(2):1-5.
[20]闫维明,聂晗,任珉,等.地铁交通引起的环境振动的实测与分析[J].地震工程与工程振动,2006,26(4):187-191.
[21]陈凯华.黏弹阻尼材料及其异型约束阻尼结构阻尼性能的实验研究[D].青岛:青岛理工大学,2015.
[2]崔日新,高亮,蔡小培.高速铁路阻尼钢轨减振降噪特性研究[J].铁道学报,2015(2):78-84.
[3]黄舰,黄微波,吕平,等.约束阻尼结构的减振降噪整体道床:CN202509337U[P].2012-10-31.
[4]Fujii K.Propagation Properties of Train-Induced Vibration from Tunnels[J].Quarterly Report of Rtri,2005,46(46):194-199.
[5]黄微波,李栋,许圣鸣,等.用于地铁减振降噪的条带界面约束阻尼道床:CN 106592343 A[P].2017-04-26.
[6]黄微波,李栋,许圣鸣,等.用于地铁减振降噪的锯齿界面约束阻尼道床:CN 106812029 A[P].2017-06-09.
[7]黄微波,李栋,许圣鸣,等.用于地铁减振降噪的网格界面约束阻尼道床:CN 106835860 A[P].2017-06-13.
[8]和振兴,翟婉明,罗震.地铁列车引起的地面振动[J].西南交通大学学报,2008,43(2):218-221.
[9]王新敏,李义强,许宏伟.ANSYS结构分析单元与应用[M].北京:人民交通出版社,2011.
[10]孙晓静.地铁列车振动对环境影响的预测研究及减振措施分析[D].北京:北京交通大学,2008.
[11]刘晶波,谷音,杜义欣.一致黏弹性人工边界及黏弹性边界单元[J].岩土工程学报,2006,28(9):1070-1075.
[12]刘晶波,杜义欣,闫秋实.黏弹性人工边界及地震动输入在通用有限元软件中的实现[C]∥全国防震减灾工程学术研讨会论文集.南京:2007.
[13]尹尚之,叶丹,梁应军,等.二维弧形一致黏弹性边界单元在ABAQUS中的应用[J].世界地震工程,2017,33(1):69-74.
[14]邹德高,徐斌,孔宪京.瑞利阻尼系数确定方法对高土石坝地震反应的影响研究[J].岩土力学,2011,32(3):797-803.
[15]洪俊青,刘伟庆.地铁对周边建筑物振动影响分析[J].振动与冲击,2006,25(4):142-145.
[16]夏禾,张楠,曹艳梅.列车对周围地面及建筑物振动影响的试验研究[J].铁道学报,2004,26(4):93-98.
[17]王福彤,陶夏新,崔高航,等.地面城轨交通近轨道区域自由地表振动实测研究[J].振动与冲击,2011,30(5):131-135.
[18]马蒙.基于敏感度的地铁列车振动环境影响预测及动态评价体系研究[D].北京:北京交通大学,2012.
[19]闫维明,聂晗,任珉,等.地铁交通引起地面振动的实测与分析[J].铁道科学与工程学报,2006,3(2):1-5.
[20]闫维明,聂晗,任珉,等.地铁交通引起的环境振动的实测与分析[J].地震工程与工程振动,2006,26(4):187-191.
[21]陈凯华.黏弹阻尼材料及其异型约束阻尼结构阻尼性能的实验研究[D].青岛:青岛理工大学,2015.