摘要
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。
Based on the project of highway tunnel crossing the thrust fault with dip angle of 75°, through a model experiment, the effect of thrust fault stick-slip dislocation on highway tunnel has been discussed. Experimental results show that under the influence of stick-slip dislocation of thrust fault, the tensile zones of tunnel lining mainly distribute in the range of 0.3D（D is the diameter of tunnel）and 1.2D away from thrust fault trace at the bottom of tunnel in the foot wall, and the compressive zones of tunnel lining mainly distribute in the range of 0.6D and 1.6D away from thrust fault trace at the top of tunnel in the foot wall. The movement of thrust fault changes the state of surrounding rock pressure. The largest surrounding pressure occurs at the bottom of the tunnel 1D away from fault trace in the hanging wall, and can increase to 2 times of initial surrounding rock pressure. The failure mode of tunnel lining caused by stick-slip dislocation of thrust fault is combination of extension breakage with direct-shear breakage. The dominating factors of tunnel damage are diagonal cracks with dip angle about 500 and 45° near the thrust fault trace.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2011年第12期2523-2530,共8页
Chinese Journal of Rock Mechanics and Engineering
关键词
工程地质
公路隧道
黏滑错动
逆断层
模型试验
engineering geology
highway tunnel
stick-slip dislocation
thrust fault
model experiment
