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地下洞室岩体加速度过大易造成围岩的不稳定,通过由模型试验得到的加速度-时程曲线分析,研究了爆炸荷载作用下不同锚固参数洞室围岩的加速度响应特征。分别阐述了洞室拱顶、底板、两帮加速度时程曲线的形态及其峰值大小,重点比较了洞室围岩因锚杆加固方式的不同对爆炸产生加速度响应的差异,结果表明,拱顶垂直和右帮水平加速度-时程曲线较光滑,而底板和左帮垂直加速度-时程曲线存在较大震动;洞室拱顶加速度峰值最大;4个洞室中锚杆间距最小的洞室,其拱顶、两帮加速度比其他洞室的小,而底板加速度比其他洞室的略大,可见减小锚杆间距可以增加洞室稳定性。
The acceleration of rock mass in underground caverns is too large to cause instability of surrounding rock. The acceleration response characteristics of surrounding rock with different anchoring parameters are explored through the acceleration-time curve analysis of model tests. The shape and the peak value of the time-history curves of the vault, the floor and the acceleration of the two caverns are respectively expounded. The difference of the acceleration response of the surrounding rock of the cavern to the explosion due to different reinforcement methods is compared. The results show that the vault Vertical and right horizontal acceleration - time curve more smooth, and the bottom and the left of the vertical acceleration - time curve there is a big vibration; peak cavern peak maximum; bolt hole in the smallest of the four caverns, The vault, two gangs of accelerations than other caverns, while the floor acceleration is slightly larger than other caverns, showing that reducing the bolt spacing can increase the stability of the cavern.