Evaluation of Negative Effect on Groundwater Environment Caused by Weathered Granite Tunnel Construction with Mining Method Based on GIS

Abstract

In order to figure out the negative effect on groundwater environment caused by weathered granite tunnel construction with mining method, the influence factors were considered comprehensively to establish the evaluation index system and classification standard for negative effect on groundwater environment. The fuzzy comprehensive evaluation and analytic hierarchy process were used to quantify the evaluation indexes and determine the weight of indexes. The system to evaluate the negative effect caused by tunnel construction with mining method on groundwater environment was developed based on GIS and was applied to a tunnel section of Guangzhou Metro line 21. The research results show that: the permeability of rock, the grouting effect and the waterproof and drainage are the major influence factors. The negative effects of DK25+984.0 ∼ DK26+000.0 and DK26+000.0 ∼ DK26+434.0 mileage sections are strong and medium, respectively, which coincided with the actual situation. This research can provide a scientific approach to evaluate the negative effect caused by tunnel construction with mining method on groundwater environment.