冲击作用下地层振动衰减规律的现场试验研究  

Field-test research of vibration attenuation rules in complex formation

作　　者：陶连金[1] 张波[1] 王文沛[1] 李积栋[1] 姜峰[2] 

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]北京城市规划设计研究院,北京100045

出　　处：《地震工程与工程振动》2011年第4期33-39,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家重大研究计划973项目(2007CB714203);北京市自然科学基金重点项目(8111001)

摘　　要：对郑州某胶质土层采用振冲法处理地基时产生的振动影响进行了现场试验,分析不同数目钻机同时施工时引起的振动在各层土体中的衰减规律以及波的传播规律,评价振动对周边建筑物的影响。研究表明:采用振冲法施工时,地基会产生较大的振动,这种振动在地表和地层内部衰减较快;冲击振动产生的振动波主要以两种途径传播:(1)沿钻孔壁形成面波,并很快发展到地表,在地表一定距离内衰减(<8m);(2)沿受冲击的胶结土层在深部以剪切波形式传播,并由深层向地表衰减。在远离振源区和地表粉土层,振动的低频成分相对丰富。Effect of vibration was tested to treat foundation using vibroflotation method on cemented layer in Zhengzhou.The vibration attenuation rules and the wave propagation rules in different formations caused by different numbers of drills were analyzed to evaluate the influence on the adjacent buildings.The results show that the vibration will be generated in foundation obviously in the process of construction using vibroflotation method.And the rate of vibration attenuation was higher on ground surface and in the inner formation.The waves caused by vibration propagated in two ways：（1）surface wave was generated on the wall of drill hole and propagated to the ground surface,and attenuated in a certain distance（8m）.（2）shear wave was generated and propagated in the cemented formation and attenuated from the deep formation to the ground surface.Vibration amplitude is mainly distributed in the low frequency range in the area far away from the vibration source and in the silt layer near the ground surface.

关 键 词：振冲法 振动 衰减规律 现场试验 

分 类 号：P315.984[天文地球—地震学]