川东向阳岩溶隧道水化学特征及成因机制研究  

Hydrochemical Appraisal and Formation Mechanism of Xiangyang Karst Tunnels in Eastern Sichuan Province

作　　者：宋词[1] 杨锐锋 谢詹 余姝萍[2] 王圣阳 张云辉[3] 裴向军[4] 刘建明[2] 代劲松[2] 曾庆华[2] SONG Ci;YANG Ruifeng;XIE Zhan;YU Shuping;WANG Shengyang;ZHANG Yunhui;PEIXiangjun;LIU Jianming;DAI Jinsong;ZENG Qinghua(Chengdu University of Technology,Chengdu,Sichuan 610059,China;China Railway Eryuan Engineering Group Co.Ltd,Chengdu,Sichuan 610031,China;Southwest Jiaotong University,Chengdu,Sichuan 611700,China;State Key Laboratory of Geological Hazard Prevention and Geological Environmental Protection,Chengdu,Sichuan 610059,China)

机构地区：[1]成都理工大学,成都610059 [2]中铁二院工程集团有限责任公司,成都610031 [3]西南交通大学,成都611700 [4]地质灾害防治与地质环境保护国家重点实验室,成都610059

出　　处：《铁道工程学报》2024年第10期44-51,共8页Journal of Railway Engineering Society

基　　金：中铁二院生态环境设计研究院引导课题(KDNQ233029);地质灾害防治与地质环境保护国家重点实验室开放基金项目(SKLGP2022K017)。

摘　　要：研究目的:涌突水是岩溶富水隧道的主要工程灾害,其研究具有重要现实意义。本文以向阳隧道为例,基于向阳隧道共计采集7个地表水样本和35个地下水样本开展水化学分析,研究西南岩溶山地深长隧道涌突水成因机制,为该线路岩溶隧道涌突水防治提供科学依据。研究结论:(1)隧址区水体的水化学类型主要以HCO_(3)—Ca为主,水质偏弱碱性,矿化度较低,地表水和地下水的化学性质相近,水力联系紧密;(2)水化学成分主要受硅酸盐岩和碳酸盐岩的风化溶解以及阳离子交换作用的影响;(3)地下水和地表水中Ca^(2+)、Mg^(2+)主要来源于岩溶地层中方解石和白云石矿物的溶解、碎屑砂岩中的长石矿物风化;(4)Na^(+)来源于大气降水以及硅酸盐矿物的风化;(5)碳酸盐矿物在岩石风化溶解中占据主导地位;(6)本文相关研究成果可为岩溶地区隧道线路设计提供参考。Research purposes:Water inrush is a major engineering hazard in karst water-rich tunnels,and its research is of great practical significance.Based on a total of 7 surface water samples and 35 groundwater samples,collected from Xiangyang Tunnel for hydrochemical analysis,this study takes Xiangyang Tunnel as an example to investigate the mechanism of water inrush in deep and long tunnels in karst mountainous areas in Southwest China and provides a scientific basis for the prevention and control of water inrush in karst tunnels along this route.Research conclusions:(1)The hydrochemical types of water samples in the tunnel area are mainly HCO_(3)-Ca,with weak alkaline and low mineralization.The chemical properties of surface water and groundwater are similar,and the hydraulic connection is close.(2)The hydrochemical composition is mainly affected by the weathering and dissolution of silicate and carbonate rocks,as well as cation exchange.(3)The Ca^(2+)and Mg^(2+)in groundwater and surface water mainly come from the dissolution of calcite and dolomite in limestone dolomite,and the weathering of feldspar minerals in clastic sandstone.(4)Na^(+)comes from atmospheric precipitation and the weathering of silicates.(5)Carbonate minerals plays a dominant role in rock weathering and dissolution.(6)The research results can provide reference for the design of tunnel lines in karst areas.

关 键 词：岩溶隧道 地下水 水化学作用 矿物风化溶解 

分 类 号：P641.3[天文地球—地质矿产勘探]