铁路隧道大断层突水涌沙处治技术

Treatment Technology for Water Inrush and Sand Discharge of Railway Tunnel Large Fault

正在修建的怀化—邵阳—衡阳铁路岩鹰鞍隧道地质条件复杂,特别是需穿越的断层破碎带突水涌沙对围岩稳定及施工安全影响非常大。本文在分析工程水文地质条件和断层破碎带突水涌沙特征的基础上,对断层及其影响带洞内外现场实测结果、后续突水涌沙地质预报结果进行了分析,提出了高位泄水并迂回绕行、长管棚超前加固、全断面超前帷幕注浆、后续支护加强等治理措施,取得了较好的堵水固结效果。

The geological conditions of Yanyingan tunnel in Huaihua-Shaoyang-Hengyang railway under construction are very complex and the influence of water inrush and sand discharge in the fault fracture zone to be traversed on surrounding rock stability and construction safety is extremely large.Based on the analysis of engineering hydrogeological conditions and characteristics of water inrush and sand discharge in fault fracture zone,the field measurement results of fault and its influence zones inside and outside the tunnel and the geological prediction results of subsequent water inrush and sand discharge were analyzed,and the treatment measures including high altitude water drainage and circuitous bypass,pre reinforcement of long pipe shed,full face advanced curtain grouting and follow up support reinforcement were proposed,which has achieved good effect of water plugging and consolidation.