Stability Analysis of Surrounding Rock Based on the Ubiquitous Joint Model

In order to explore the influence of joint factors on the stability for surrounding rock of pilot tunnels under the construction of underground station by the pile-beam-arch approach. Against the background of Yatai Street Station in Changchun, the pilot tunnel model around the ubiquitous joints was constructed. For parts of the joint parameters, a six factors and five levels orthogonal scheme was built and parameter sensitivity was analyzed. The results showed that the order of joint factors that influenced the stability for surrounding rock of pilot tunnels from large to small was the internal friction angle of joints, the cohesion of joints, the dip angles of joints, the dilatancy angle of joints, the tensile strength of joints and the inclination of joints. With the increase of internal friction angles and cohesion of joints, the stability of surrounding rock increased gradually.