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针对公路隧道正交穿越75°倾角逆断层的情况,通过模型试验得到逆断层黏滑错动对公路隧道的影响规律。由试验结果可知:在逆断层黏滑错动影响下,隧道衬砌结构的主要受拉区为下盘距离断层迹线0.3D～1.2D(D为隧道洞径)范围内的隧道衬砌底部,受压区主要在下盘距离断层迹线0.6D～1.6D范围内的隧道衬砌顶部。逆断层黏滑错动引起的围岩压力变化最大发生在隧道底部上盘距离断层迹线1D位置,增幅可达2倍的初始围岩压力。在逆断层黏滑错动影响下,隧道衬砌结构的破坏形式是弯曲张拉和直接剪切组合破坏,其中在断层迹线附近的2条倾角为50°和45°斜裂缝为隧道结构破坏的主控因素。
Aiming at the situation that the highway tunnel crosses the fault with the angle of 75 ° orthogonally, the influence law of the inverse fault slips on the highway tunnel is obtained through the model test. From the test results, it can be seen that the main tension zone of the tunnel lining structure is the bottom of the tunnel lining within the range of 0.3D ~ 1.2D (D is the tunnel diameter) The nip is mainly at the top of the tunnel lining within the range of 0.6D ~ 1.6D from the fault trace of the lower plate. The maximum pressure of surrounding rock caused by the slip-slip behavior of the reverse fault occurred at the 1D position of the upper plate of the tunnel at the bottom of the tunnel from the fault trace, increasing up to twice the initial surrounding rock pressure. Under the influence of reverse slip-slip, the failure modes of the tunnel lining structure are combined with bending and direct shear, in which 2 inclined angles of 50 ° and 45 ° in the vicinity of the fault track are damaged by the tunnel structure Master factor.