木寨岭板岩隧道塌方的结构失稳分析及预防措施研究

目前国内已有较多穿越板岩地层的隧道工程，由于板岩的独特性质，板岩隧道工程问题多发，塌方是较为频发的现象之一。通过对木寨岭隧道塌方现象的分析，研究板岩隧道塌方的工程特征及影响因素，在此基础上运用板的稳定理论探讨板岩塌方现象的发生机制，结合实例进行分析，提出预防塌方现象的关键措施，并通过现场实际效果进行检验。结果表明，板岩的层状特性及初期支护跟进的不及时是发生塌方的根本因素，预防塌方现象应从这两点加以入手。木寨岭隧道后续施工的顺利进行，证明对于板岩隧道塌方原因的认识及预防措施的选取较为准确，对类似隧道工程塌方的预防及治理有一定的借鉴和参考意义。

Structural instability analysis and prevention measures of structural collapse in Muzhailing slate tunnel

Currently there are many tunnels through the slate formation, slate tunnel engineering problems are frequently occur due to the unique nature of slate, and collapse phenomenon is a large part of the engineering problems . The feature and influence factors of slate tunnel are studied by the analyzing the collapse phenomenon of Muzhailing tunnel, then the board stability theory is used in the collapse mechanism of slate, and combine the engineering practice with board stability theory subsequently. Finally, the key methods to prevent collapse phenomenon are showed, and the method is used in the subsequent engineering. The results show that the slate layered characteristics and slowly construction of initial support is the fundamental factors in the collapse occurred, preventing the collapse phenomenon need to study primarily from these two points. The subsequent sections of Muzhailing tunnel are constructed safely; it’s proved that collapse causes of slate tunnel are well analyzed. That is useful to the similar engineering when they want to prevent or deal with the collapse of slate tunnel.