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Study on the Ecological Environment Impact of Groundwater Discharge in the Period of Railway Tunnel Construction

Author: FuYiLin
Tutor: BaiMingZhou
School: Beijing Jiaotong University
Course: Environmental Science
Keywords: Tunnel Groundwater Environmental Impact Fuzzy Comprehensive Evaluation
CLC: X820.3
Type: Master's thesis
Year: 2009
Downloads: 107
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Abstract


In tunnel engineering , groundwater, and the tunnel has a complex relationship , especially in the construction period , the tunnel through the rock mass is often occurrence of different types of groundwater tunnel excavation will be the impact of groundwater , and a lot of water gushing appears Mud Outburst accident. At the same time , the groundwater environment is also affected by tunnel , change the groundwater environment , causing groundwater drainage dry well water , surface water storage capacity to reduce , and even caused the river drying up , especially in the land surface within funnel surface inadequate water supply may cause the surface of plants , thus affecting the growth of vegetation the prolonged prone to soil desertification , soil erosion . In this paper, a tunnel in the Shijiazhuang-Taiyuan Passenger Dedicated example, by collecting data and site survey , focusing on long-term observations of water level in the main towns and villages ecological environment sensitive points Seisensui . The analysis of the changes in the characteristics of the groundwater table and the radius of influence . The combination of tunnel construction process encountered water damage instances , the analysis of the interaction between the tunnel and groundwater environments formed water damage from hydrological and meteorological conditions . And on this basis to establish GMS two-dimensional model to simulate the dynamic changes in the groundwater level , the results show that the water level has been declining , and tunnel construction on the groundwater level dropped some impact . In this paper, to consider the relevant factors of geography, geology, hydrogeology , and tunnel engineering , the constructed tunnel groundwater discharge hierarchical model to determine the impact on the ecological environment comprehensive evaluation of the ecological evaluation and rating indicators grading standards , the application of analytic hierarchy process to determine the evaluation index system weight of each index value, the fuzzy Analytic Hierarchy Process tunnel groundwater discharge to the ecological environment impact assessment . The results show that , during the construction of the tunnel groundwater discharge on the ecological environment comprehensive evaluation index average of 2.69 between the poor and the general evaluation . Tunnel construction caused some leakage of groundwater , have a negative impact on the ecological environment , a greater impact on groundwater .

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CLC: > Environmental science, safety science > Environmental Quality Assessment and Environmental Monitoring > Analysis and Evaluation of Environmental Quality > General issues > Environmental Impact Assessment
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