雷打石隧道冒顶处理及效果分析

On roof collapse treatment and effect analysis of Leidashi tunnel

结合雷打石隧道工程开挖冒顶处理情况,分析了隧道开挖冒顶原因,提出采用洞内注浆加固超挖区、加强冒顶监控量测、加强支护参数等处理措施,工程实践表明,经过处理后的隧道变形均在规范允许范围内,取得了良好的效果。

Combining with the roof collapse treatment in the excavation of Leidashi tunnel,the paper analyzes the reasons for the tunnel excava-tion roof collapse,points out some measures including the consolidation of overexcavation areas of hole grouting,improvement of collapse monito-ring and measurement and support parameter,and proves by the engineering practice that the tunnel deformation after the treatment achieves bet-ter effect within the permitted scopes.