Research On The Evaluation System Of The Impact Of ZiYun Tunnel Construction On Groundwater

In the context of China's entry into the modernization environment,tunnel traffic construction has gradually become the mainstream direction of infrastructure in mountainous areas.With the continuous improvement of the awareness of sustainable development of people and the natural environment,environmental problems encountered in national transportation infrastructure construction projects have been affected.More and more attention,especially the impact on the groundwater environment during tunnel construction.The water inrush phenomenon encountered during the tunnel construction not only adversely affects the safety of tunnel construction and operation,but also causes groundwater leakage in the project area to cause the groundwater level to drop,and even the water source to dry up,which seriously affects the ecological environment on the surface.Therefore,this article relies on the Zi Yun Tunnel project.First,it studies the geological data and the actual status of the project,determines the evaluation factors for the impact of the tunnel construction on the groundwater environment,and constructs an evaluation system.Second,it analyzes the influencing factors by constructing an interpretive structural model and applying fuzzy mathematical analysis.The influence of the construction of this tunnel on the groundwater environment was studied,and the following conclusions were mainly drawn:(1)Based on the research results at home and abroad,determine the evaluation factors for the impact of the tunnel construction on the groundwater environment,and analyze from the four aspects of physical geography factors,geologicalhydrogeological factors,tunnel design factors,and tunnel construction factors.It contains 4 first-level indicators and 17 second-level indicators.An evaluation system for the impact of tunnel construction on groundwater has been constructed,and the evaluation index classification standards have been proposed.(2)A multi-step ladder structure model was established between the influencing factors using the ISM method.The hierarchical relationship between the influencing factors was clarified,and the direct,indirect and deep causes of the negative effects of the groundwater environment were determined.(3)For the evaluation of the impact of tunnel construction on the groundwater environment,a comprehensive analysis is carried out using fuzzy comprehensive analysis.First,the evaluation index is quantified by a membership function to determine the fuzzy matrix.Second,it is better than the ANP-entropy combination weighting method to determine.The weight value of each evaluation index.Finally,taking the Zi Yun Tunnel as an example of the project,the fuzzy comprehensive evaluation method was used to evaluate the impact of the tunnel construction on the groundwater.The impact level was divided into the fourth level and the impact was serious.