山岭隧道施工诱发地下水位下降环境风险评价

发布时间：2018-03-12 13:13

本文选题：地下水　切入点：环境影响　出处：《铁道工程学报》2016年01期 　论文类型：期刊论文

【摘要】：研究目的:隧道施工对沿线生态环境产生一定的影响,不合理的开挖及排水可能导致突水突泥灾害,也可能造成地下水疏干、井水干枯、地表蓄水量减少等生态环境影响。为定量研究隧道排水对沿线铁路生态环境的影响,本文以某铁路隧道为例,综合考虑施工排放地下水对地下水位变化的特点及影响半径以及地理、地质、水文地质、隧道工程等相关因素,构造隧道地下水排放对生态环境影响综合评价的层次模型,确定生态评价指标以及评级指标的分级标准,应用层次分析法确定评价指标体系中各指标的权重值,采用模糊层次分析法进行隧道地下水排放对生态环境的影响评价。研究结论:(1)建立了地下水位下降对生态环境影响的风险评价指标,采用模糊综合评价方法对工作区域进行生态评价,结果表明影响区域范围内生态环境综合评判值为2.69,评价级别介于差和一般范围内,说明隧道施工对生态环境造成一定影响;(2)从动态的角度开展了地下水位监测,得到了隧道排水对地下水位下降的影响程度,验证了模糊综合评价结果;(3)该研究结果可为山岭隧道安全施工、控制岩溶涌水提供指导。
[Abstract]:Research purposes: tunnel construction has a certain impact on the ecological environment along the line. Unreasonable excavation and drainage may lead to water inrush and mud inrush disaster, may also cause groundwater drain and well water drying up. In order to quantitatively study the influence of tunnel drainage on railway ecological environment along the railway line, this paper takes a railway tunnel as an example. Considering the characteristics and radius of underground water level variation caused by underground water discharge, as well as the related factors such as geography, geology, hydrogeology, tunnel engineering and so on, the hierarchical model of comprehensive assessment of tunnel groundwater discharge on ecological environment is constructed. The classification standard of ecological evaluation index and rating index is determined, and the weight value of each index in the evaluation index system is determined by AHP. Fuzzy Analytic hierarchy process (AHP) is used to evaluate the impact of groundwater discharge on the ecological environment. The fuzzy comprehensive evaluation method is used to evaluate the ecological environment of the working area. The results show that the comprehensive evaluation value of ecological environment in the affected area is 2.69, and the evaluation level is in the range of difference and general. It shows that tunnel construction has a certain impact on the ecological environment. (2) the underground water level monitoring is carried out from the dynamic point of view, and the degree of influence of tunnel drainage on the decrease of underground water level is obtained. It is verified that the fuzzy comprehensive evaluation results can provide guidance for the safe construction of mountain tunnel and the control of karst water gushing.
【作者单位】：北京交通大学;
【基金】：国家自然科学基金(41072256) 中央高校基本科研业务费专项资金(2015YJS121)
【分类号】：U455.1;X82

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