冲击振动在砂土中传播的模型试验研究
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摘要
通过模型试验研究了冲击荷载引起的振动在砂土中传播和衰减的规律,并探讨了隔振板的隔振效果.结果表明:在模型箱边界处设置泡沫隔振板,能够较好地控制振动波在边界处的反射效应;在冲击荷载作用下,土体振动随测点与震源的距离增大而迅速衰减,加速度峰值沿水平、竖向和对角线方向的衰减可用公式amax=kR-β进行拟合;隔振板对隔振板后面的土体能够起到一定的隔振和减振作用,但对隔振板前面的土体起到了相反的效果,这是由于振动波在隔振板处发生反射的缘故.
Model test was performed to investigate the propagation and decay of impact-load induced vibration in sandy soil,and the effect of vibration screening panel was furthermore studied.The results show that the polystyrene wave-absorbing panel placed at the boundary of test box is effective in controlling the boundary reflection of vibration waves.The impact-load induced vibration decays rapidly with the increase of distance from the load point,and the attenuation of peak acceleration along horizontal,vertical and diagonal direction can be well fitted by the function of amax=kR-β.Polystyrene screening panel,behind which vibration can be reduced,has the negative effect of intensifying the vibration just before it,this may be caused by the reflecting of vibration wave at the screening panel.
Model test was performed to investigate the propagation and decay of impact-load induced vibration in sandy soil,and the effect of vibration screening panel was furthermore studied.The results show that the polystyrene wave-absorbing panel placed at the boundary of test box is effective in controlling the boundary reflection of vibration waves.The impact-load induced vibration decays rapidly with the increase of distance from the load point,and the attenuation of peak acceleration along horizontal,vertical and diagonal direction can be well fitted by the function of amax=kR-β.Polystyrene screening panel,behind which vibration can be reduced,has the negative effect of intensifying the vibration just before it,this may be caused by the reflecting of vibration wave at the screening panel.
引文
[1]吴世明.土动力学[M].北京:中国建筑工业出版社,2000.
[2]王杰贤.动力地基与基础[M].北京:科学出版社,2001.
[3]Richart F E,Hall J R,Woods R D.土与基础的振动[M].徐筱在,徐国彬,曾国熙,等译.北京:中国建筑工业出版社,1976.
[4]Das B M.土动力学原理[M].吴世明,顾小章译.杭州:浙江大学出版社,1984.
[5]Wood R D.Screening of surface waves in soils[J].Journal of the Soil Mechanics and Foundations Divi-sions,ASCE,94(4):951-979.
[6]蒋维强,欧阳立胜.强夯地震效应特征研究[J].防灾减灾工程学报,2005,25(1):45-48.JIANG Wei-qiang,OUYANG Li-sheng.Study ofearthquake effect of dynamic compaction[J].Journalof Disaster Prevention and Mitigation Engineering,2005,25(1):45-48.
[7]GB/T 50123—1999,土工试验方法标准[S].
[8]谭悍华,孙进忠,祁生文.强夯振动衰减规律的研究[J].工程勘察,2001(5):11-14.
[9]滕忻利.强夯引发的环境振动效应分析[D].北京:北京交通大学土木建筑工程学院,2008.
[2]王杰贤.动力地基与基础[M].北京:科学出版社,2001.
[3]Richart F E,Hall J R,Woods R D.土与基础的振动[M].徐筱在,徐国彬,曾国熙,等译.北京:中国建筑工业出版社,1976.
[4]Das B M.土动力学原理[M].吴世明,顾小章译.杭州:浙江大学出版社,1984.
[5]Wood R D.Screening of surface waves in soils[J].Journal of the Soil Mechanics and Foundations Divi-sions,ASCE,94(4):951-979.
[6]蒋维强,欧阳立胜.强夯地震效应特征研究[J].防灾减灾工程学报,2005,25(1):45-48.JIANG Wei-qiang,OUYANG Li-sheng.Study ofearthquake effect of dynamic compaction[J].Journalof Disaster Prevention and Mitigation Engineering,2005,25(1):45-48.
[7]GB/T 50123—1999,土工试验方法标准[S].
[8]谭悍华,孙进忠,祁生文.强夯振动衰减规律的研究[J].工程勘察,2001(5):11-14.
[9]滕忻利.强夯引发的环境振动效应分析[D].北京:北京交通大学土木建筑工程学院,2008.
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