隔振沟槽几何参数对隔振效果的影响研究
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摘要
为了研究隔振沟槽深度、宽度及其位置等几何参数对隔振效果的影响,通过进行沟槽隔振的室外试验,以地表振幅降低比为评价指标,将上述几何参数对隔振效果的影响进行分析。结果表明:沟槽深度和振源距离是影响隔振效果的重要因素,沟槽宽度对隔振效果影响相对较小。沟槽深度与瑞利波波长的比值为0.71～0.82时,沟槽隔振效果显著;当该比值大于0.82时,增加沟槽深度对强化隔振效果无益。当振源距离与瑞利波波长的比值为1.43～1.60时,沟槽可取得良好的隔振效果;当该比值小于1.43时,增加振源距离可显著强化隔振效果;当该比值大于1.60时,隔振效果有减弱的趋势,但此时隔振效果依然存在。另外,沟槽深度与宽度的比值、振源距离与深度的比值也是影响沟槽隔振效果的重要因素。当深度与宽度的比值为7.82～9.48时,沟槽可以获得良好隔振效果,继续增加该比值不会显著增强隔振效果。当振源距离与深度的比值为1.42～2.64时,可以获得良好的隔振效果;当该比值大于2.64时,沟槽的隔振效果较弱。
In order to study the influence of geometric parameters such as depth,width and position of the vibration isolation trench on the vibration isolation effect,the outdoor test of isolation trench is carried out with the evaluation index of the reduction ratio of acceleration amplitude on ground surface,and the influence of the above geometric parameters on the vibration isolation effect is analyzed.The results show that the depth of the trench and the distance from the trench to the vibration source are the important factors affecting the isolation effect,and the width of the trench has little effect on the isolation effect.When the ratio of trench depth to Rayleigh wave length is 0.71～0.82,the isolation effect of trench is remarkable,and when the ratio is greater than 0.82,increasing the depth of trench is not beneficial to strengthen the isolation effect.When the ratio of source distance to Rayleigh wave length is 1.43～1.60,good isolation effect can be obtained,when the ratio is less than 1.43,the isolation effect can be significantly enhanced by increasing the source distance,and when the ratio is greater than 1.60,the isolation effect will weaken,but at this time the effect of isolation still exists.In addition,the ratio of trench depth to trench width and the ratio of source distance to trench depth are also important factors affecting the isolation effect of the trench.When the ratio of depth to width of the trench is 7.82～9.48,good isolation effect can be obtained,but the further increase of the ratio will not significantly enhance the isolation effect.When the ratio of source distance to trench depth is 1.42～2.64,the isolation effect is obvious.But when the ratio is greater than 2.64,the isolation effect becomes weaker.
In order to study the influence of geometric parameters such as depth,width and position of the vibration isolation trench on the vibration isolation effect,the outdoor test of isolation trench is carried out with the evaluation index of the reduction ratio of acceleration amplitude on ground surface,and the influence of the above geometric parameters on the vibration isolation effect is analyzed.The results show that the depth of the trench and the distance from the trench to the vibration source are the important factors affecting the isolation effect,and the width of the trench has little effect on the isolation effect.When the ratio of trench depth to Rayleigh wave length is 0.71～0.82,the isolation effect of trench is remarkable,and when the ratio is greater than 0.82,increasing the depth of trench is not beneficial to strengthen the isolation effect.When the ratio of source distance to Rayleigh wave length is 1.43～1.60,good isolation effect can be obtained,when the ratio is less than 1.43,the isolation effect can be significantly enhanced by increasing the source distance,and when the ratio is greater than 1.60,the isolation effect will weaken,but at this time the effect of isolation still exists.In addition,the ratio of trench depth to trench width and the ratio of source distance to trench depth are also important factors affecting the isolation effect of the trench.When the ratio of depth to width of the trench is 7.82～9.48,good isolation effect can be obtained,but the further increase of the ratio will not significantly enhance the isolation effect.When the ratio of source distance to trench depth is 1.42～2.64,the isolation effect is obvious.But when the ratio is greater than 2.64,the isolation effect becomes weaker.
引文
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[19]何为,薛卫东,唐斌.优化试验设计方法及数据分析[M].北京:化学工业出版社,2015,6:148-151,344.He Wei,Xue Weidong,Tang Bin.Optimized experimental design method and data analysis[M].Beijing:Chemical Industry Press,2015,6:148-151,344.
[2]Woods R D.Screening of surface waves in soils[J].Journal of the Soil Mechanics and Foundations Division,1968,94(4):221-314.
[3]Andersen L,Nielsen S R K.Reduction of ground vibration by means of barriers soil improvement along a railway track[J].Soil Dynamics and Earthquake Engineering,2005,25(7):701-716.
[4]Yang Y B,Hung H H.A parametric study of wave barriers for reduction of train induced vibrations[J].International Journal for Numerical Methods in Engineering,1997,40(20):3729-3747.
[5]Hung H H,Yang Y B,Chang D W.Wave barriers for reduction of train-induced vibrations in soils[J].Journal of Geotechnical and Geoenvironmental Engineering,2004,130(12):1283-1291.
[6]Banerjee P K,Ahmad S,Chen K.Advanced application of BEM to wave barriers in multi-layered three-dimensional soil media[J].Earthquake Engineering and Structural Dynamics,1988,16(7):1041-1060.
[7]Tsai P H.Effects of open trench dimension on screening effectiveness for high speed train induced vibration[J].Applied Mechanics and Materials,2013,256:1187-1190.
[8]Chiang C,Tsai P.A numerical study of the screening effectiveness of open trenches for high-speed train-induced vibration[J].Shock and Vibration,2014:1-11.
[9]Jiang J,Toward M G R,Dijckmans A,et al.Reducing railway induced ground-borne vibration by using trenches and buried soft barriers[C].Noise and Vibration Mitigation for Rail Transportation Systems Springer Berlin Heidelberg,2015:555-562.
[10]徐斌,雷晓燕,徐满清,等.饱和土体中空沟对移动荷载被动隔振的2.5D边界元法分析[J].岩土力学,2012,33(4):1079-1086+1102.Xu Bin,Lei Xiaoyan,Xu Manqing,et al.Analysis of effectiveness of passive isolation for vibration due to moving loads on saturated soil by using open trench with 2.5Dboundary element method[J].Journal of Rock and Soil Mechanics,2012,33(4):1079-1086+1102.
[11]袁万,蔡袁强,史吏,等.基于2.5维有限元饱和土地基中空沟隔振性能研究[J].岩土力学,2013,34(07):2111-2118.Yuan Wan,Cai Yuanqiang,Shi Li,et al.Study of vibration-isolation efficiency of open trench in saturated ground by 2.5Dfinite element method[J].Journal of Rock and Soil Mechanics,2013,34(07):2111-2118.
[12]邓亚虹,夏唐代,陈敬虞.车辆荷载作用下隔震沟隔震效率影响因素分析[J].岩土力学,2007,(05):883-887+894.Deng Yahong,Xia Tangdai,Cheng Jingyu.Analysis of efficiency of vibration isolating groove subjected to vehicle load[J].Rock and Soil Mechanics,2007,(05):883-887+894.
[13]熊浩,高广运,王小岗.均质地基中空沟对交通荷载的隔振分析[J].中南大学学报(自然科学版),2011,42(08):2459-2468.Xiong Hao,Gao Guangyun,Wang Xiaogang.Analysis of isolating vibration from traffic by open trench in homogenous ground[J].Journal of Central South University(Science and Technology),2011,42(08):2459-2468.
[14]熊浩,高广运,王小岗,等.层状地基中空沟对交通荷载的竖向隔振分析[J].岩土力学,2011,32(04):1131-1137.Xiong Hao,Gao Guangyun,Wang Xiaogang.Analysis of isolating vertical vibration from traffic loads by open trench in layered ground[J].Rock and Soil Mechanics,2011,32(4):1131-1137.
[15]高广运,彭争光,李伟,等.三维层状地基空沟主动隔振分析[J].西北地震学报,2006,(03):210-215+220.Gao Guangyun,Peng Zhengguang,Li Wei,et al.3DAnalysis of active vibration isolation by open trench in layered ground[J].Northwestern Seismological Journal,2006,(03):210-215+220.
[16]高广运,何俊锋,李志毅,等.饱和地基上列车运行引起的地面振动特性分析[J].振动工程学报,2010,23(02):179-187.Gao Guangyun,He Junfeng,Li Zhiyi,et al.Analysis of ground vibration generated by a moving train on saturated ground[J].Journal of Vibration Engineering,2010,23(02):179-187.
[17]吴世明,曾国熙,陈云敏,等.利用表面波频谱分析测试土层波速[J].地震工程与工程振动,1988,8(04):27-32.WU Shiming,ZENG Guoxi,CHENG Yunmin,et al.Measurement of wave velocity of soil deposits by spectral analysis of surface waves[J].Earthquake Engineering and Engineering Dynamics,1988,8(04):27-32.
[18]陈云敏,吴世明,曾国煕.表面波频谱分析法及其应用[J].岩土工程学报,1992,14(03):61-65.CHENG Yunmin,WU Shiming,ZENG Guoxi.Surface wave spectrum analysis method and its application[J].Chinese Journal of Geotechnical Engineering,1992,14(03):61-65.
[19]何为,薛卫东,唐斌.优化试验设计方法及数据分析[M].北京:化学工业出版社,2015,6:148-151,344.He Wei,Xue Weidong,Tang Bin.Optimized experimental design method and data analysis[M].Beijing:Chemical Industry Press,2015,6:148-151,344.