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Stability Analysis of Surrounding Rock Based on the Ubiquitous Joint Model
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摘要: 为研究洞桩法地下车站施工过程中节理因素对导洞围岩稳定性的影响,以长春市亚泰大街站为工程背景,建立了导洞遍布节理模型,针对部分节理参数建立6因素5水平正交方案,进行参数敏感性分析。研究表明:影响导洞围岩稳定性的节理因素从大到小排序依次是节理内摩擦角、节理黏聚力、节理倾角、节理剪胀角、节理抗拉强度、节理倾向;且随着节理内摩擦角和节理黏聚力的增大,导洞围岩稳定性逐渐增加。Abstract: 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.
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