老虎嘴隧道塌方应急抢险处理方案研究

Study on Emergency Treatment Scheme of Laohuzui Tunnel Collapse

西藏林芝派墨公路老虎嘴隧道地质条件复杂,围岩破碎,稳定性较差,加上连续降雨与地下水影响,开挖过程中掌子面中部及右侧渗漏水由点滴状出水发展为线状出水,掌子面出现掉块、溜渣,局部出现掉块、坍塌现象,结合工程实际,针对隧道塌方施工技术手段展开分析,详细论述了塌方段、塌方变形段空腔、超前支护、超前小导管施工及排水管施工等措施,为类似隧道塌方应急处理提供了借鉴。

The geological conditions of Laohuzui tunnel of Paimo highway in Nyingchi of Tibet are complex,the surrounding rock is broken,the stability is poor,coupled with the influence of continuous rainfall and groundwater,during the excavation process,the leakage water in the middle and right side of the tunnel face develops from dribbling water to linear water,and the tunnel face appears falling blocks,slag sliding,and local falling blocks and collapse.Combined with the engineering practice,this paper aims at the tunnel collapse construction technology.The measures of collapse section,collapse deformation section cavity,advance support,advance small pipe construction and drainage pipe construction are discussed in detail,which provides reference for similar tunnel collapse emergency treatment.