雪山梁隧道施工对地下水环境负效应评价研究

发布时间：2018-05-18 14:02

本文选题：隧道施工 + 灰色关联法　；参考：《西南交通大学》2015年硕士论文

【摘要】：伴随着隧道建设快速发展,基础设施环保观念的加强,隧道建设过程中对地下水环境的影响受到更多的关注。隧道建设涌突水导致地下水渗漏、地表沉降等负效应,同时地下水反作用于隧道,对隧道建设和运营有不利的影响。本文研究隧道建设对地下水环境的影响,首先研究水文地质工程分析当地地下水的特征,其次进行水化学分析,对隧道内的出水来源进行识别,并对隧道工程的涌水量进行预测,最后通过层次分析法对隧道工程负效应进行评价。本文依托雪山梁隧道建设项目,研究了隧道施工对地下水环境负面影响,主要得出以下结论：(1)根据工程地质概况得到本地区岩溶发育条件极好,但当地降雨偏少,多年平均降雨约729mm,地下水埋藏较深,洞身大部分处于垂直循环带中,部分处于水平循环带中,因此隧道开挖对地下水的影响不大。(2)通过现场地表水地下水取样,采用水化学分析隧道水与取水点之间的联系,通过灰色关联法得出隧道水与大气降水的关联度最大,隧道出口隧道水与大气降水的关联度为0.84,与黄龙景区的关联度仅为0.39,隧道进口隧道水与大气降水的关联度为0.72,表明隧道水来源为大气降水且与黄龙景区无水力联系,与施工揭露的分析结果一致。(3)通过三维数值模拟对雪山梁隧址区进行概化,对补给源、岩体-水、边界条件进行概化,模拟在无隧道、隧道开挖、开挖后丰水年以及注浆后的地下水影响区和涌水量,该方法求得根据本方法隧道开挖后无措施情况、开挖后丰水期、开挖注浆后涌水量平均分别为7281.3m3/d,,14722.8 m3/d,2897.0 m3d。(4)研究隧道开挖后对地下水评价的负效应,从地下水补给因素、地下水径流因素和隧道工程因素三个方面分析,判断负效应中较弱和中等占主要优势,雪山梁隧道开挖对地下水影响介于较弱和中等之间,隧道内出现明显或股状涌水,出现小范围降水漏斗,局部地表水受影响,流量偏少。
[Abstract]:With the rapid development of tunnel construction and the strengthening of environmental protection concept of infrastructure, more attention has been paid to the impact of tunnel construction on groundwater environment. The water inrush of tunnel construction leads to the negative effects of groundwater leakage and surface subsidence, and the reaction of groundwater to the tunnel has a negative effect on the tunnel construction and operation. In this paper, the influence of tunnel construction on groundwater environment is studied. Firstly, the characteristics of local groundwater are analyzed by hydrogeological engineering, and then hydrochemical analysis is carried out to identify the source of effluent in the tunnel. Finally, the negative effect of tunnel engineering is evaluated by analytic hierarchy process (AHP). Based on the construction project of Xueshanliang Tunnel, this paper studies the negative effects of tunnel construction on groundwater environment, and draws the following conclusion: (1) according to the general situation of engineering geology, the karst development condition in this area is excellent, but the local rainfall is on the low side. The annual average rainfall is about 729mm, the groundwater is buried deep, the hole body is mostly in the vertical circulation zone, and part is in the horizontal circulation zone, so the tunnel excavation has little influence on the groundwater. The relationship between tunnel water and water intake point is analyzed by hydrochemistry, and the maximum correlation degree between tunnel water and precipitation is obtained by grey correlation method. The correlation degree between tunnel water and precipitation at the exit of tunnel is 0.84, that with Huanglong scenic area is only 0.39, and that between tunnel water and precipitation at tunnel entrance is 0.72, which indicates that the water of tunnel comes from atmospheric precipitation and has no hydraulic relation with Huanglong scenic area. In accordance with the analysis results revealed by construction, the three-dimensional numerical simulation is used to generalize the site of Xueshan beam tunnel, to generalize the source of recharge, rock-water and boundary conditions, and to simulate the excavation of the tunnel without the tunnel. The influence area and water quantity of groundwater after excavation and grouting are obtained by this method. According to this method, no measures are taken after tunnel excavation, and the period of high water after excavation is obtained. The average inflow of water after excavation and grouting is 7281.3m3 / d respectively 14722.8 m3s / d 2897.0 m3d.d4) the negative effects of tunnel excavation on groundwater evaluation are studied and analyzed from three aspects: groundwater recharge factor, groundwater runoff factor and tunnel engineering factor. In the judgment of the negative effect, the weak and moderate are the main advantages. The excavation of the Xueshanliang Tunnel has a weak and moderate influence on groundwater. There are obvious or femoral inrush in the tunnel, a small range of precipitation funnel, the local surface water is affected, and the discharge is less.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X82;U455

【参考文献】