考虑震源扰动作用的深埋隧洞开挖失稳研究

随着深部资源开挖难度的逐渐加大,加之震动作用的影响,深埋地下工程开挖安全与稳定控制成为面临的主要问题。采用数值模拟方法,对点震源和震面波扰动作用下深埋隧洞开挖稳定的影响进行数值计算,分析震源波在围岩体中的传播和衰减规律及其对地下工程开挖的稳定影响和冲击作用。研究结果表明:1)震源波主要向巷道方向传播,并不断向巷道围岩四周扩散,波动作用表现为对顶板整体向下、两边帮向内侧、底板向上;2)无支护条件下巷道围岩体受波动影响很大,应加强开挖支护强度或设置柔性吸能层以减小冲击破坏。研究结果可为深埋地下工程开挖安全和稳定控制提供依据。

Study on Instability of Excavation of Deep Tunnels Considering Disturbance Action of Vibration

As the difficulty in the excavation of deep underground works under vibration effect increases, the safety and stability of the excavation of deep underground works become more and more important. In this paper, the stability of the excavation of deep tunnels under the action of the point vibration source and the seismic surface wave disturbance is calculated by means of numerical simulation, and the propagation and attenuation laws of source wave and its effect on the stability of underground works are analyzed. The research results show that： 1 ） The source wave spreads in the direction of roadway and spreads constantly around the roadway, and causes roof subsidence, side wall extrusion and floor heave; 2） The surrounding rocks of the roadway without supporting have been severely disturbed, as a result, the support for the excavation should be strengthened and flexible impact-energy-absorbing-layer should be installed so as to reduce the damage. The paper can provide reference for the control of the safety and stability of the excavation of similar deep underground works in the future.