【摘要】 兰渝铁路木寨岭隧道是在高地应力、碳质板岩等软弱围岩的复杂地质条件下修建的隧道,在碳质板岩段出现了明显的大变形和局部破坏。针对木寨岭隧道的大变形,文章分析了碳质板岩大变形发生的影响因素,探究了碳质板岩的塑变、板梁弯曲、剪切滑移、压杆破坏等大变形机理,提出了调整隧道围岩受力、加强支护、超前控制等施工措施。更多还原

【Abstract】 The Muzhailing tunnel of the Lanzhou-Chongqing railway, which is built under the complicated geological conditions of weak surrounding rocks, such as high ground stress, carbonaceous slate, and so on, exhibits obvious large deformation and partial failure in the carbonaceous slate section. Aiming at the large deformation of the Muzhailing tunnel, the influence factors regarding the occurrence of large deformation in carbonaceous slate are analyzed in this paper. The large deformation mechanism is studied, including the plastic deformation of carbonaceous slate, bending of the plate-girder, shear slip, and damage to the pressure bar. Thus, the construction measures, such as the surrounding rock stress, the reinforced support, and the advance control, are adjusted in order to control the large deformation of a tunnel, and this experience provides a reference for future tunnel construction in carbonaceous slate.更多还原