叙大铁路某隧道溶洞超前预报及处理技术研究

摘要

跟随叙大铁路尹家岩隧道开挖,对其做了超前预报。当隧道开挖至DK70＋551,在其后方出现一大型溶洞,分析了该溶洞的形态特征、岩性、水文地质等情况,提出了换填＋护墙、改线和桥梁跨越3个方案,从工期、投资、技术条件、施工难易程度等进行比较,决定采用换填＋护墙处理方案进行整治。%Following Yinjiayan tunnel excavation,we have made an advanced prediction.When the tunnel was excavated to DK70+ 551,a large karst cave appeared behind.After analyzing the morphological characteristics,rocks,hydrogeology and other situations of the karst cave,we propose three programmes of replacement and parapet walls,changing the line and bridging across.Compared with duration,investment,technical conditions and the difficulty of construction,we decide to adopt the plane of replacement and parapet walls.