逆断层粘滑错动对公路隧道影响的试验研究

Research on Model Experiment of Effect of Thrust Fault Stick-slip Rupture on Road Tunnel

摘要:

结合大量地震断层的案例，通过对断层倾角为75°、60°、45°三种工况下逆断层粘滑错动影响下的隧道应变分布情况和破坏过程的研究，可以得到：断层倾角越小，上盘范围内隧道顶部的纵向拉应变越大，并且拉应变进入过载状态时的错动位移值越小。当断层倾角为75°时，隧道的主要破坏形式为直接剪切破坏；当断层倾角为45°时，隧道的破坏形式以弯曲拉破坏为主；而且45°倾角工况下隧道的破坏范围为上盘距离断层面2D（D为隧道洞径）~下盘距离断层面0.2D，75°倾角工况下隧道的破坏范围为上盘距离断层面0.8D~下盘距离断层面0.4D。

Abstract:

Based on the survey of the earthquake fault cases, through a model experiment, the effect of the thrust fault stick-slip dislocation in the different inclination angles on the road tunnel have been discussed. The experiment results show that the main failure mode of tunnel lining caused by the stick-slip dislocation of the thrust fault is the direct-shear breakage with the fault inclination angle is 75°, The main failure mode of tunnel lining caused by the stick-slip dislocation of the thrust fault is the bent extension breakage with the fault inclination angle is 45°. The smaller fault inclination angle, the longitudinal extensive strain of the tunnel top is larger, and the influence area of tunnel is wider. The tunnel failure range is 2D(D is the diameter of the tunnel) away from the fault in the hanging wall to 0.2D away from the fault in the foot wall, when the inclination angle is 45°. The tunnel failure range is 0.8D away from the fault in the hanging wall to 0.4D away from the fault in the foot wall, when the inclination angle of the fault is 75°.