经验法确定隧道Ⅳ级围岩二衬的合理支护时机

The Study on Appropriate Support Time of Experience Method Determining Second Lining for Tunnel Ⅳ Surrounding

主要介绍了使用经验法确定隧道Ⅳ级围岩二衬的合理支护时机,通过分析Ⅳ级围岩拱顶下沉、周边收敛、围岩压力、初衬内力时程图,最后得出Ⅳ级围岩二衬合理的支护时间。

By analyzing Ⅳ surrounding arch settlement,around convergence and surrounding pressure,the paper mainly introduced the appropriate support time of experience method determining second lining.