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为探析岩溶隧道开挖过程中隧址区水文地球化学特征、岩溶水补径排条件以及隧道涌水与地表水文环境的相关关系,以华蓥山隧道工程施工为依托,开展动态水文监测和分析。利用水文动态监测体系反馈的水质和水量信息研究隧址区地下水水文地球化学特征、判定隧道开挖后地下水影响范围。结果表明:1)常规水质分析和同位素分析显示隧址区地下水径流条件较好,径流途径较短,并且受大气降水影响密切;2)隧址区地表布设的4个水文监测点均呈现流量、水位减少趋势,证明隧道建设对本区地下水系统造成一定影响,其影响程度不一;3)相关分析表明隧道涌水与龙古井、龙神洞2个地表水点呈强相关性,具有显著性。
In order to analyze the hydrogeochemical characteristics of tunnel area, karst water make-up and drainage conditions and the relationship between tunnel gushing water and surface hydrological environment in tunnel excavation, dynamic hydrological monitoring and analysis are carried out based on the construction of Huayingshan tunnel. The hydrogeochemical characteristics of groundwater in tunnel area are studied by the information of water quality and water quantity fed back by hydrological dynamic monitoring system to determine the influence range of groundwater after tunnel excavation. The results show that: 1) The routine water quality analysis and isotope analysis show that the groundwater runoff conditions in the tunnel area are good, the runoff paths are short and are closely affected by the atmospheric precipitation; 2) The four hydrological monitoring points laid on the surface of the tunnel area show flow, The water level declines. It proves that the tunnel construction has a certain influence on the groundwater system in this area, and the degree of influence is different. 3) The correlation analysis shows that there is a strong correlation between the water inflow in the tunnel and the two surface water points of Longgujing and Longshen Cave.