某地下厂房岩锚梁爆破振动测试与研究

Test and Research on Blasting Vibration of Rock-anchored Beam in an Underground Powerhouse

通过测试邻近压力引水隧洞和主厂房爆破开挖对岩锚梁混凝土的影响,根据萨道夫斯基经验公式,采用回归分析方法计算出爆破地震波衰减系数α和因素系数K,得到地下洞室爆破地震波传播衰减经验公式。比较邻近压力引水隧洞和主厂房爆破地震波作用下岩锚梁的振动响应,结果显示邻近压力引水隧洞爆破开挖引起的爆破振动强度较大;地下洞室爆破地震波垂直向振动速度衰减比水平向快。结合工程实际,提出降低爆破地震效应的措施,将岩锚梁爆破振动速度控制在安全范围内,为同类工程提供参考依据。从后期监测数据看,研究成果取得了较好的应用效果。

Through the test of rock-anchored beam concrete vibration induced by blasting of the main workshop and its adjacent pressure diversion tunnels, attenuation coefficient of seismic wave and factors coefficient are acquired by the method of regression analysis according to Sadaovsky empirical formula, and the empirical formula of seismic wave are obtained. The comparisons of vibration responses of rock-anchored beam show that the vibration intensity induced by the adjacent pressure diversion tunnels blasting is higher than that induced by the main workshop blasting. The vertical vibration velocity attenuates faster than the horizontal vibration velocity. On account of construction conditions and requirements, the measurements for reducing seismic affects are proposed for the safety vibration velocity control of rock-anchored beam. The research results provide reference to similar projects. The post-monitoring data indicate the research results are affectively applied in the project.