Effect of layered joints on rockburst in deep tunnels
Effect of layered joints on rockburst in deep tunnels
复制标题
分层节理对深埋隧道岩爆的影响
DOI：
10.1007/s40789-022-00489-x
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发表时间：
2022-12-01
影响因子：
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通讯作者：
Zhang, Zhiqiang
中科院分区：
文献类型：
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作者：
He, Mingming;Zhao, Jinrui;Zhang, Zhiqiang
围岩中节理的存在对隧道岩爆有很大的影响。本文研究了不同倾角和间距的层状节理对深部巷道岩爆的影响，分析了围岩的破坏范围、变形过程、围岩内部应力变化、破坏速度和破坏动能。从而确定围岩的破坏类型。结果表明，岩爆强度随岩体质量指标（RQD）的降低而增大，而围岩变形速率则先增大后减小。变形速率在RQD = 50 ~ 70之间存在一个转折点，在此转折点以下，围岩变形速率逐渐减小，最终不再发生岩爆。岩爆总是垂直于节理方向发生。当sigma（x）= sigma（y）时，随着节理倾角从45度变化到90度，岩爆强度首先减小（从45度到60度），然后增大（从60度到90度）。结合应力应变能的演化规律，将岩爆过程划分为四个阶段。
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 sigma(x) = sigma(y), as the joint inclination angle changes from 45 degrees to 90 degrees, the intensity of a rockburst first decreases (from 45 degrees to 60 degrees), and then increases (from 60 degrees to 90 degrees). When combined with the evolution law of stress and strain energy, the rockburst process can be divided into four stages.