基于岩体质量Q系统的隧道围岩分级

岩体质量Q系统未考虑隧道上覆不同地质条件岩土体位置关系的相互影响。阐述了岩体质量Q系统在进行围岩分级时存在的问题,基于摩尔-库伦强度准则,提出了计算隧道围岩松动区和承载区的公式,得出当隧道围岩等级越高,即围岩稳定性越差时,松动区外半径、承载区外半径以及塑性区外半径越大;通过将理论分析方法与数值模拟方法相结合,求出了隧道围岩重要性系数,提出了一种隧道围岩分级新计算公式。

Tunnel Surrounding Rock Classification Base on Rock Mass Q-system

The rock mass Q-system does not take into account the mutual influence of positional relation about the rock masses of the different geological conditions that overlying on the tunnel. This paper expounds the problems of rock mass Q-system in the classification of surrounding rock, and based on Mohr-Coulomb strength criterion, puts forward the formula of calculating the loose zone and bearing zone of tunnel surrounding rock, It come to a concluded that when the surrounding rock grade of the tunnel is higher, which means the surrounding rock stability is worse, the outer radius of the loose zone, the outer radius of the bearing zone and the outer radius of the plastic zone are larger. By combining theoretical analysis method with numerical simulation method, this paper obtained the importance coefficient of tunnel surrounding rock and proposed a new calculation formula of tunnel surrounding rock classification.