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粘弹性介质中爆破地震波的速度变化

发表时间:2009-01-31  浏览量:2079  下载量:888
全部作者: 逄焕东,陈士海,段宝福,高文乐
作者单位: 山东科技大学土木建筑学院
摘 要: 研究了装药爆炸后产生的地震波在标准线性固体中的传播规律。取粘弹性介质中的变截面隔离杆体,对模型简化并且在端部施加负指数衰减的边界条件。通过拉氏变换求得地震波质点位移的衰减变化规律,并进一步得到了相速度、质点速度在时间域和频率域的变化关系。质点速度随距离的增加而很快衰减,这与弹性介质不同,后者一直传播下去,没有衰减。由于介质内的复杂作用,相速度随频率的降低而降低,质点速度随距离的增大而衰减,不同距离上的衰减幅度也不相同,相位也随速度的衰减时刻在变化,不同地点、不同时刻的波形可能完全不同。考虑到介质的粘弹特性,爆破地震波的传播与弹性状态下明显不同,粘弹介质更加接近地震波的真实传播状况。
关 键 词: 爆破工程;地震波;粘弹性介质;频率域
Title: Study on velocity variation of blasting seismic wave in visco-elastic media
Author: PANG Huandong, CHEN Shihai, DUAN Baofu, GAO Wenle
Organization: School of Civil Engineering and Architecture, Shandong University of Science and Technology
Abstract: The seismic wave’s propagation rule in the standard linear solid has been studied after the charge’s initiating. An isolation model has been selected and simplified in the visco-elastic media and a minus exponent decreasing boundary condition has been imposed on one tip. By the Laplace transform method, the decreasing rule of particle displacement of seismic wave has been resolved and so does the rule of phase velocity, particle velocity in time and frequency domain respectively. The particle velocity decreases with the increasing of distance sharply. It is different to the elastic media, the latter will propagate without any attenuation. For the complexity of media, the phase velocity decreases with the frequency and the particle velocity declines according to the distance. The range of decrease varies in different distance, and so does the phase in different places and times. Considering the visco-elasticity, the propagation of the blasting seismic wave is obviously different from that in elastic stage, and the former one conforms better to the practical propagation of seismic wave.
Key words: blasting engineering; seismic wave; visco-elastic media; frequency domain
发表期数: 2009年1月第2期
引用格式: 逄焕东,陈士海,段宝福,等. 粘弹性介质中爆破地震波的速度变化[J]. 中国科技论文在线精品论文,2009,2(2):175-180.
 
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