宜万铁路野三关隧道响水坪地下暗河发育特征及方案研究

Study on Development Characteristics and Treatment Scheme of Xiangshuiping Underground River of Yesanguan Tunnel in Yichang-Wanzhou Railway

隧道穿越地下暗河时易发生突水突泥灾害,破坏区域水文环境,影响隧道施工和运营。以宜万铁路野三关隧道为工程背景,分析隧区地层岩性、地质构造、河流水系和岩溶发育特征;基于隧区工程水文地质条件,详细分析了隧道所遭遇的响水坪暗河系统的总体规模、地下水发育特征以及隧道穿越段暗河的发育规模、充填物性质、涌水特征、稳定性等。根据该暗河系统的工程水文地质条件及与隧道的空间关系,研究了增设排水洞方案、加深侧水沟方案和封堵方案;综合考虑周边环境影响、施工干扰、工程投资、隧道长期运营安全等因素,推荐采用增设排水洞方案;该方案在暗河治理中取得了很好的效果,对类似工程具有重要的借鉴意义。

Disasters of water inrush and mud gushing may occur suddenly when tunnel passing through the underground river,then it damages regional hydrological environment,influences the construction safety and operation safety of tunnel.This paper,taking Yesanguan Tunnel of the Yichang-Wanzhou Railway as an example,analyzes the strata lithology,geological structure,river system and the karst development characteristics.Further,based on the tunnel's hydrogeological conditions,this paper analyzes in detail the general scale and the developmental attribute of groundwater of Xiangshuiping Underground River system which the tunnel passing through,also analyzes the development scale,filling material's property,water inrush's character,stability at the intersection point between the tunnel and the underground river.Based on hydrogeological conditions of the underground river system and the spatial relationship with the tunnel,three schemes of adding drainage holes,deepening side ditches and plugging were studied.Comprehensively considering the surrounding environment,construction interference,project investment,long-term operational safety and other factors,the scheme of adding drainage hole was recommended.With this scheme,good results have been achieved in the underground river treatment,which has some reference significance for similar projects.