近距离爆破引起的隧道周边振动场

首先分析了近距离爆破造成的隧道周边振动场分布规律 ,指出最大振动速度出现在爆破振动波正入射部位的墙壁和拱部 ,墙脚点振动速度较小 ,背爆侧振速只有迎爆侧的 1 / 2 5。其次 ,根据大量测试数据分析 ,论述了爆破性质、地质条件对振动衰减的影响 ,并作了进一步的理论解释。最后根据振动分析 ,提出了有关降低爆破振动的措施

VIBRATION FIELD AT TUNNEL CONTOUR INDUCED BY A CLOSE-IN BLASTING

Firstly, the distribution of the blasting induced vibration field at contour of adjacent tunnel is studied. It is pointed that maximum vibration velocity occurs at frontal wall and arch to the blasting seismic wave; the vibration velocity at the wall corner is smaller and the vibration velocity of the other side wall is 1/25 of that of the frontal side. Secondly, based on a large amount of test data, effect of blasting features and geological conditions on the vibration attenuation is discussed and theoretically explained. Finally, some measures to minimize the blasting vibration are proposed on the basis of blasting vibration analysis.