摘要
轨道交通、动力机器、爆破施工及打桩等人工振源会对邻近建筑物的正常使用、精密仪器的加工和使用及人们的生活产生危害,环境振动控制已成为土动力学研究的热点。提出一种带孔波阻板填充Duxseal的联合隔振方法(简称DXWIB),并对其在0~3 s简谐垂直激励下的隔振性能进行现场试验,对比测试DXWIB隔振体在不同嵌入深度、厚度、激振力和激振频率下的地面振动加速度,分别计算了加速度和位移的均值、幅值,并绘制了AR曲线。试验结果表明:与水平方向相比,DXWIB屏障对地表竖向振动的隔振效果较优;DXWIB屏障隔振效率随距离变化不均匀,地基中埋置DXWIB时,地表位移振幅衰减系数均小于1;与DXWIB厚度、激振力和激振频率等影响因素相比,DXWIB顶面距地表距离对隔振效果的影响最为显著,并存在最佳埋置深度和临界厚度;DXWIB改善了WIB只适用于10 Hz以下低频减振特性,提高了减振的频宽,从试验数据来看,在5~70 Hz频率下均有良好的隔振效果。
The vibration induced by human activities such as rail traffic,power machine,blast construction and pile driving could seriously influence the normal use of adjacent buildings,the production and use of precision instruments,and the normal production and life of human beings.The control of environmental vibration has become a research focus of soil dynamics.In this paper,a newly designed combined vibration isolation barrier,i.e.,wave impeding block(WIB)with incorporation of Duxseal(DXWIB),is proposed to reduce the ground vibrations,and the isolation performance is evaluated by field experiment under harmonic vertical excitation within 0–3 s.Through a set of tests,the amplitude and mean value of ground vibration acceleration and displacement with different embedded depths,DXWIB thicknesses,excitation forces and excitation frequencies are obtained and compared.The corresponding curves of amplitude attenuation ratio are drawn.The test results show that:compared with vibration in the horizontal direction,the isolation effect of DXWIB on ground vertical vibration is better.The vibration isolation efficiency of DXWIB barrier varies unevenly with the distance.When DXWIB is embedded in the foundation,the attenuation coefficient of surface displacement amplitude is less than 1.Compared with the influence factors such as DXWIB thickness,excitation force and excitation frequency,the embedment depth of DXWIB has the most significant influence on the vibration isolation effect,and there is a best buried depth and a critical thickness.DXWIB can improve the characteristics of WIB only for low-frequency vibration damping below 10 Hz,and increase the frequency bandwidth of vibration damping.From the experimental data,it has good vibration isolation effect at 5–70 Hz.
作者
高盟
张致松
王崇革
田抒平
GAO Meng;ZHANG Zhi-song;WANG Chong-ge;TIAN Shu-ping(Shandong Province Key Laboratory of Civil Engineering&Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;Institute of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao,Shandong 266590,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2021年第2期537-546,共10页
Rock and Soil Mechanics
基金
山东省自然科学基金(No.ZR201702160391)
关键词
现场试验
WIB-Duxseal联合隔振
竖向激振
隔振效果
field test
WIB-Duxseal combined vibration isolation
vertical excitation
vibration isolation effectiveness
