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本文通过甘川公路七道梁隧道断层构造岩的宏、微观特征研究,首次确定了该处断层的力学性质及活动方式;并发现以粘土矿物为主的混合型断层泥有利于断层的新滑动.笔者由断层构造岩显微构造形迹所反演出的 NE—SW 向水平挤压应力,则是本区 NNW 向与 NEE 向共轭剪性节理密集出现而造成隧道围岩掉块或塌方的主因.从而提出:断裂发育程度,应列为划分围岩类型的参考指标
In this paper, macroscopic and microscopic characteristics of the fault structure rocks of the Qitagiangliang tunnel of Ganchuan Highway were studied, and the mechanical properties and activity modes of the faults were identified for the first time. It is also found that the mixed fault mud mainly composed of clay minerals is favorable for the new slip of faults. The horizontal compressive stress of NE-SW, which is derived from the microstructural features of fault tectonic rocks, is the main cause of block collapse or collapse of the tunnel surrounding rock due to the intensive occurrence of NNW and NEE conjugate shear joints in this area. It is suggested that the degree of fracture development should be listed as a reference index for dividing the type of surrounding rock