爆破振动下隧道初支混凝土振速衰减规律  

Vibration velocity attenuation law of initial support concrete in tunnel under blasting vibration

作　　者：唐先习[1] 张春洋 王要武 李旦合 高毅仁 李明泽 TANG Xian-xi;ZHANG Chun-yang;WANG Yao-wu;LI Dan-he;GAO Yi-ren;LI Ming-ze(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730000,China;Second Engineering Co.,Ltd.,of China Railway 21st Bureau Group,Lanzhou 730000,China)

机构地区：[1]兰州理工大学土木工程学院,兰州730000 [2]中铁二十一局集团第二工程有限公司,兰州730000

出　　处：《工程爆破》2022年第6期42-50,共9页Engineering Blasting

摘　　要：为研究爆破振动作用下隧道初支混凝土喷层的振动响应与初支混凝土喷层爆破振动衰减规律,依托于成昆铁路峨眉至米易段扩能工程沈家坝1号隧道,通过现场试验获得爆破振动信号,使用小波变换方法对爆破振动信号进行时-频分析,得到了爆破振动信号的时频特征。依据萨道夫斯基经验公式对试验的振速数据进行线性回归分析,得到爆破振动衰减规律,并拟合出爆破动载作用下初支混凝土喷层振速与药量、爆心距之间的关系曲线,用于指导隧道的钻爆施工。In order to study the vibration response of the primary sprayed concrete layer of the tunnel under the action of blasting vibration and the blasting vibration attenuation law of the primary sprayed concrete layer, relying on the Shenjiaba No. The blasting vibration signal is time-frequency analyzed by using the wavelet transform method, and the time-frequency characteristics of the blasting vibration signal are obtained. According to Sadovsky’s empirical formula, linear regression analysis was carried out on the vibration velocity data of the test, and the law of blasting vibration attenuation was obtained, and the relationship between the velocity of the primary shotcrete sprayed layer under the action of blasting dynamic load, the amount of charge, and the distance between blast centers was fitted. The curve is used to guide the drilling and blasting construction of the tunnel.

关 键 词：初支混凝土 钻爆施工 振动衰减 

分 类 号：TD235[矿业工程—矿井建设]