冲击振动在砂土中传播的模型试验研究  

Experimental Investigation on Propagation of Impact Load Induced Vibration in Sandy Soil

作　　者：向国威[1] 叶冠林[1] 王建华[1] 

机构地区：[1]上海交通大学土木工程系,上海200240

出　　处：《上海交通大学学报》2012年第1期136-141,共6页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金项目(41002097);上海市科学技术委员会资助项目(09231201500);上海市重点学科建设项目资助(B208)

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.

关 键 词：模型试验 冲击荷载 振动衰减 隔振 

分 类 号：TU435[建筑科学—岩土工程]