逆断层粘滑错动对公路隧道影响的试验研究

结合大量地震断层的案例,针对逆断层倾角为75°,60°,45°三种工况通过模型试验研究不同倾角逆断层粘滑错动下隧道应变分布规律和整个破坏过程.试验结果表明: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;45°倾角工况下隧道的破坏范围为上盘距离断层面2.0 D(D为隧道洞径)至下盘距离断层面0.2 D,75°倾角工况下隧道的破坏范围为上盘距离断层面0.8 D至下盘距离断层面0.4 D.

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

Based on a survey of earthquake fault cases and a model experiment, a research was made of the effect of the thrust fault stick slip dislocation at different inclination angles in road tunnels. The experiment results show that the samller the fault inclination angle is, the larger the longitudinal extensive strain of the tunnel top is; the main failure mode of tunnel lining caused by the stick slip dislocation of the thrust fault is the direct shear breakage at the fault inclination angle of 75°, and that of the thrust fault is the bent extension breakage at the fault inclination angle of 45°. The tunnel failure range is 2.0D(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°.