爆破振动作用下大型地下洞室群围岩动力响应及合理间距分析

大型地下水封石油洞库由多个地下洞室构成,洞室通常不设衬砌结构,在洞库设计时,洞室之间的间距是需要重点考虑的一个因素.依托某地下水封石油洞库工程,采用现场监测与数值模拟相结合的方法,分析了爆破振动作用下,地下洞室群围岩的动态响应及振动衰减规律.地下洞室掌子面爆破引起的围岩振速在横断面方向随远离爆心呈指数衰减;当在爆破洞室...

Dynamic response of surrounding rock of large underground caverns under blast vibration and reasonable spacing between adjacent caverns

Large-scale underground water-sealed oil tank consists of several underground caverns usually without lining structure.When it is designed,the spacing between caverns is a key factor to be considered.Here,dynamic response and vibration attenuation law of surrounding rock of underground caverns under blast vibration were analyzed using site monitoring combined with numerical simulation.Results showed that vibration velocity of surrounding rock decreases exponentially with the distance away from the blast center in cross-section direction;when there is an excavated cavity near the blast cavern,vibration of mass point at the side wall facing blast of the excavated cavity has amplification effect,and the peak vibration velocity is amplified by 2.2-2.5 times,while the peak vibration velocity at the side back to face blast of surrounding rock decreases obviously with the reducing range of 25%-50%;when considering the safe spacing between adjacent caverns,the peak vibration velocity at the side wall facing blast of the adjacent excavated cavern is taken as the judgment index,so incavern blast construction,the peak vibration velocity at the side wall facing blast of the adjacent excavated cavern decreases exponentially with increase in the net spacing of caverns;according to the relevant regulations,the net spacing between adjacent caverns should not be less than 30 m.