当前位置: X-MOL 学术Int. J. Coal Sci. Technol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Effect of layered joints on rockburst in deep tunnels
International Journal of Coal Science & Technology Pub Date : 2022-04-05 , DOI: 10.1007/s40789-022-00489-x
Mingming He , Jinrui Zhao , Bianyuan Deng , Zhiqiang Zhang

The existence of joints in the surrounding rock mass has a considerable effect on tunnel rockbursts. Herein, we studied the effect of layered joints with different inclination angles and spacings on rockburst in deep tunnels and investigated the failure area, deformation process of the surrounding rock mass, stress change inside the surrounding rock mass, velocity of the failed rock, and the kinetic energy of the failure. The failure type of the surrounding rock mass can thus be determined. The results showed that the intensity of rockburst increases as rock quality designation (RQD) decreases, while the deformation rate of the surrounding rock mass first increases and then decreases. The deformation rate exhibits a turning point between RQD = 50 and 70, below which the deformation rate of the surrounding rock mass gradually decreases, ultimately ceasing to be a rockburst. Rockburst always occurs perpendicular to the direction of the joint. When σx = σy, as the joint inclination angle changes from 45° to 90°, the intensity of a rockburst first decreases (from 45° to 60°), and then increases (from 60° to 90°). When combined with the evolution law of stress and strain energy, the rockburst process can be divided into four stages.



中文翻译:

层状节理对深部隧道岩爆的影响

围岩中节理的存在对隧道岩爆有相当大的影响。在此,我们研究了不同倾角和间距的层状节理对深部隧道岩爆的影响,并研究了破坏区域、围岩变形过程、围岩内部应力变化、破坏岩石的速度和故障的动能。因此可以确定围岩体的破坏类型。结果表明,岩爆强度随着岩石质量等级(RQD)的降低而增加,而围岩变形率则先增大后减小。变形率在 RQD = 50 和 70 之间呈现一个转折点,低于该转折点围岩变形率逐渐减小,最终不再是岩爆。岩爆总是垂直于节理方向发生。什么时候σ x  =  σ y,随着节理倾角从 45° 到 90° 变化,岩爆强度先减小(从 45° 到 60°),然后增加(从 60° 到 90°)。结合应力应变能演化规律,岩爆过程可分为四个阶段。

更新日期:2022-04-05
down
wechat
bug