【摘要】 构造活跃区大量工程实例表明，地应力是影响深埋隧道稳定性的重要因素之一。应用三维应力场有限元数值模拟探讨了青藏高原及邻区最大水平主应力方向和隧道轴向夹角φ与侧压力系数K_H耦合变化对深埋隧道应变能分布及岩爆倾向的影响。对不同地应力条件下深埋隧道围岩应变能密度分布特征进行了分析，并通过数值分析初步厘定最大水平主应力方向和隧道轴向夹角、侧压力系数与隧道不同关键位置应变能密度的多元回归方程。研究结果表明：最大水平主应力方向和隧道轴向夹角φ=45°左右时，隧道夹角变化对岩爆倾向性影响最大；最大水平主水平应力方向和隧道轴向垂直时，K_H变化对围岩应变能密度影响最显著；当最大水平主应力方向和隧道轴向平行时，K_H变化对围岩应变能密度影响最小。所厘定的多元回归方程已通过多条青藏高原及邻区典型深埋隧道验证，可用于快速评估夹角和侧压力系数对隧道稳定性的影响，高效服务隧道规划设计。更多还原

【Abstract】 The engineering projects of deep buried tunnels in different positions of tectonic active zone in previous research indicate that the stability of deep tunnels is deeply relevant to in-situ stress. To analyse the influence mechanism of in-situ stress state on rock burst proneness of deep-buried-curved tunnel in Qinghai-Tibet Plateau and its adjacent region, three-dimensional finite element numerical simulation is done to explore the combine action of the angle φ between the maximum horizontal principal stress orientation and tunnel axis, and lateral pressure coefficient K_H on the distribution of strain energy density and rock burst proneness. The results conclude that when φ is about 45°,the change of φ has the greatest influence on the proneness of rock burst. When the maximum horizontal principal stress orientation is perpendicular to the tunnel axis, the change of K_H has the most significant effect on strain energy density of surrounding rock. When the maximum horizontal principal stress orientation is parallel to the tunnel axis, the change of K_H has the least influence on strain energy density of surrounding rock. The multivariate regression equation is verified by a number of typical deep buried tunnels in the Qinghai-Tibet Plateau and the surrounding area. The multiple regression equation can be applied to quickly evaluate the influence of φ and K_H on tunnel stability serving the tunnel planning and design efficiently.更多还原