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深埋隧洞中岩爆轴向位置的确定以及破坏机理的研究是岩爆灾害预测和防治的理论基础。根据深埋长大隧洞围岩的结构、受力以及变形特点,建立了梁柱力学模型。在弹性范围内,运用力法,求解了该一次超静定梁柱的挠曲线方程和转角方程,得出了临界力的解析表达式。以锦屏II级水电站的松动圈实测数据为依据,给出了梁柱模型截面尺寸的确定方法,计算了围岩各部位存在稳定性问题的临界长度值以及达到临界稳定状态的特征长度值。最后,给出了深埋隧洞坑状岩爆的演化模型,分析了掌子面推进过程中,开挖卸荷、动力扰动等对于裂纹的萌生和扩展、围岩结构的形态和稳定性以及岩爆破坏模式的影响。
The determination of rockburst axial location and the failure mechanism in deep tunnels are the theoretical basis for the prediction and prevention of rock burst. According to the structure, force and deformation characteristics of surrounding rock of deep and long tunnel, the beam and column mechanics model is established. In the elastic range, using the force method, the bending equation and angle equation of the statically indeterminate beam are solved and the analytical expression of the critical force is obtained. Based on the measured data of the loose ring of Jinping II hydropower station, the method of determining the cross-sectional dimension of the beam-column model is given. The critical length of stability problems in each part of the surrounding rock and the characteristic length of the critical stable state are calculated. At last, the evolution model of potholeamorphic rockburst in deep tunnel is given. The initiation and propagation of cracks during excavation and dynamic unloading are analyzed. The morphology and stability of rock mass are analyzed. Impact of blasting mode.