小相岭隧道围岩力学状态测试及大变形成因分析

为解决小相岭隧道平导和正洞的围岩大变形问题,采用现场试验的方法对围岩力学状态进行测试,基于实测数据对隧道大变形成因进行分析并提出针对性控制治理对策。结果表明:1)隧道围岩强度偏低且存在明显的各向异性,初始地应力以水平应力为主,属极高地应力;现场实测结果显示底板处围岩损伤范围明显大于边墙处,推断隧道大变形为底隆变形,这与现场结构变形特征相符。2)隧道大变形的主要原因是下伏缓倾层状软弱岩层、高水平地应力、支护结构不对称等因素,尤其是平导底板的不对称结构对抵抗底隆变形能力较弱。3)在采取平导设置仰拱、正洞打设长锚杆、增大预留变形量、提升结构的刚度及强度等措施后,隧道变形得到了有效控制。

Analysis of soft rock roadway deformation mechanism in Zhangshuanglou Mine

On basis of ground stress surveying and analysis of physical nature and mechanics character of rock, the deformation mechanism of west main roadway in Zhangshuanglou Mine is studied. It is put forward that engineering mechanics nature, infiltration of water and concentrated stress on pillar are the main factors to affect stability of the west main roadway. The overall thinking used to restore the roadway is raised.