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近几年来我国铁路隧道在推广新奥法的研究上取得了许多有益的成果。在众多的感性认识中,我们发现隧道周边围岩的收敛稳定除了跟围岩的类别、施工质量(如爆破、喷混凝土、设置锚杆等)有关外,还跟隧道的纵横轴比有关。本文就以此种现象,假设铁路隧道是近于椭圆形的,在始应力作用下,采用弹性力学解,得到隧道纵横轴端的围岩应力公式,继而对围岩进行稳定性探讨,提出合理隧道断面的构想。
In recent years, many achievements have been made in the research of China’s railway tunnel in promoting the new Austrian law. Among numerous perceptual knowledge, we find that the stability of the surrounding rock surrounding the tunnel is related to the type of surrounding rock and the quality of construction (such as blasting, shotcreting, bolt installation) and the aspect ratio of the tunnel. This paper takes this phenomenon, assuming that the railway tunnel is nearly oval, under the initial stress, using elastic mechanics solution, the vertical and horizontal axis of the tunnel wall rock stress formula, and then the stability of the surrounding rock discussed, put forward a reasonable tunnel Sectional conception.