襄渝铁路新大巴山隧道涌水量预测研究

Research on the Prediction of Groundwater Inflow of the New Dabashan Tunnel on Xiangfan-Chongqing Railway

研究目的:新大巴山隧道是襄渝铁路增建二线安康至重庆段控制性工程,由于其地下岩溶水丰富,因此隧道涌水量预测对该铁路设计和施工具有重要意义。本文采用前苏联科学家普洛特尼科夫关于天然地下水资源的"储量分类"法(三种类型:动储量、静储量、调节储量),在分析地下岩溶水垂直发育的分带性、储水构造特征、施工期间地下水涌(突)水特征等基础上,划分出地下岩溶水储量类型,研究地下水动储量与降雨的线性关系,预测隧区百年一遇降雨条件下隧道的最大涌水量。研究结论:(1)隧址区地下岩溶水可分为动储量和静储量两种类型;(2)隧道地下涌水主要为动储量释放;(3)涌水量大小与降雨量密切相关;(4)预测的最大涌水量为215×10~4m^3/d;(5)研究方法经工程实践证明较有成效,研究成果对类似工程地质条件下的隧道工程建设具有借鉴意义。

Research purposes： The New Dabashan Tunnel construction is the controlling key project of the second Xiangfan-Chongqing Railway line,as a rich-water karst tunnel,the groundwater inflow forecast has important significance for railway design and construction. This article uses former Soviet scientist Плотников＇ s ＂reserves classification＂（three types： dynamic reserves, static reserves, and adjusted reserves） on natural groundwater resources,to analyze and divide the the type of groundwater reserves during the New Dabashan Tunnel construction on Xiangfan-Chongqing Railway,study on the linear relationship between groundwater dynamic reserves and rainfall,to predict maximum volume of groundwater inflow into the tunnel under one-hundred-year rainfall in the project area.Research conclusions：（1） The karst groundwater in the tunnel area can be divided into two types： static reserves and dynamic reserves.（2） Underground water in the tunnel is mainly released by dynamic reserves.（3） The amount of water inflow is closely related to rainfall.（4） The maximum predicted water inflow is 215 × 10~4 m3/d.（5） The engineering practice proved that this research method is more effective,and the result can be used for reference in the construction of tunnel under the similar engineering geological condition.