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为解决爆破开挖下穿引水隧洞对新建铁路隧道爆破振动影响问题,采用现场监测的方法,研究了既有隧道对爆破振动的响应.结果表明:引水隧洞爆破时,在相同爆破参数、相同距离条件下,掌子面靠近既有隧道时的爆破振动速度大于离开时的爆破振动速度;同一测试断面内,迎爆面的质点峰值振动速度最大,背爆面相对较小,距离爆心距越远,这种差别越小;掏槽孔的质点峰值振动速度最大,周边孔的最小;爆破地震波频率成份丰富,但主振频率比较稳定,多数在100～200 Hz之间,主频域在30～500 Hz之间;以部分实测数据和萨道夫斯基经验公式为基础进行回归分析,建立了任意质点峰值振动速度预测公式.该成果对上下交叉近距离隧道爆破开挖及振动控制工程具有一定的参考价值和指导意义.
In order to solve the problem of the impact of blasting tunneling on the blasting vibration of new railway tunnel, the method of on-the-spot monitoring was used to study the response of the existing tunnel to blasting vibration.The results show that in the blasting of the diversion tunnel, with the same blasting parameters and the same distance , The blasting vibration velocity of the face near the existing tunnel is greater than the blasting vibration velocity when leaving the tunnel. In the same test section, the peak vibration velocity of the blasting face is the largest, the backface is relatively small, the farther away from the f , The difference is smaller; the peak vibration velocity of the cut hole is the largest and the perimeter hole is the smallest; the frequency of blasting seismic wave is rich, but the main vibration frequency is relatively stable, most of them are between 100 and 200 Hz, 500 Hz. Based on the measured data and the Sadovsky empirical formula, the formula for predicting the peak vibration velocity of any particle is established. The result has a certain value for the excavation and vibration control of tunnels with up and down crossings Reference value and guiding significance.