基于地下水环境影响的过江隧道工程降水方案研究
发布时间：2018-10-24 14:37
【摘要】：圣莲岛过江隧道施工开挖降水工程可能影响地下水的资源功能,导致地下水位的下降,可能使区域内自然环境及生态环境受到影响,地下水流场系统的改变,引起内湖水位下降,居民饮用水供应困难等问题。 本文结合工程地质背景及区域水文地质条件,对过江隧道工程降水方案进行了初步设计。通过工程降水方式的比选,项目选用管井井点降水方式,并根据其设计原理进行了初步降水方案设计,根据不同的地质情况本文将过江隧道分为三段进行了分段设计。考虑施工期间圣莲岛内湖与本项目管井降水的相互影响,圣莲岛出口段(LAK0+800～LAK0+1060)影响半径计算值为658m,影响半径较大对岛屿及内湖的地下水影响较大,因此通过目标函数法：以工程造价与环境经济损失之和最小建立目标函数,以基坑内水位降深、单井出水量大小为约束条件,求解最少的降水井、最小的抽水量对隧道出口段进行降水方案优化,并通过数值模拟方法对优化降水井布置进行预测,分析了隧道周围可能发生的地表沉降情况和区域地下水资源量的影响,并提出了相应地下水环境保护措施。 通过Visual MODFLOW对降水方案的水位降深预测可知,本项目降水方案影响半径与库萨金潜水公式计算出的降水影响半径基本一致,表示本项目降水方案可行。隧道出口优化段显示,沿着隧道出口方向地下水位降低幅度变缓,垂直与隧道出口两侧水位下降幅度相对较大,方案的优化避开了本隧道段降水对圣莲岛内湖的水位的影响,从最大程度上降低了隧道出口段井点降水对周围地下水环境的影响,使地下水水位的降低趋势发生变化,表示本项目研究的工程降水优化方案可行。
[Abstract]:The excavation and dewatering project of Shenglian Island Crossing River Tunnel may affect the function of groundwater resources, lead to the decrease of groundwater level, may affect the natural and ecological environment in the area, and change the groundwater flow field system. Causes the lake water level to fall, the resident drinking water supply difficulty and so on question. Based on the engineering geological background and regional hydrogeological conditions, the preliminary design of the dewatering scheme for the cross-river tunnel project is carried out in this paper. Through the comparison and selection of engineering dewatering methods, the project selects the well point dewatering method for pipe wells, and designs the preliminary dewatering scheme according to its design principle. According to the different geological conditions, this paper divides the cross river tunnel into three sections to carry on the section design. Considering the interaction between the lake in Shenglian Island and the precipitation of the pipe well in this project during construction, the calculated value of the influence radius of LAK0 800~LAK0 1060 is 658m, and the influence radius is larger to the groundwater of the island and the inner lake. Therefore, the objective function is established by using the objective function method: the minimum sum of engineering cost and environmental and economic losses is taken as the objective function, and the water level in the foundation pit is lowered and the water output of a single well is taken as the constraint condition to solve the minimum precipitation well. The minimum pumping amount is used to optimize the precipitation scheme of the tunnel exit section, and the optimal precipitation well layout is predicted by numerical simulation method. The possible surface subsidence around the tunnel and the influence of regional groundwater resources are analyzed. The corresponding environmental protection measures for groundwater are put forward. The prediction of water level drop by Visual MODFLOW shows that the influence radius of precipitation scheme of this project is basically consistent with that calculated by Kuzagin's diving formula, which indicates that the precipitation scheme of this project is feasible. The optimized section of tunnel exit shows that the decrease of groundwater level along the direction of tunnel exit becomes slower, and the water level on both sides of vertical and tunnel exits is relatively large. The optimization of the scheme avoids the influence of precipitation in this tunnel section on the water level of the lake in Shenglian Island. The influence of well point precipitation on the surrounding groundwater environment is reduced to the greatest extent, and the trend of groundwater level decrease is changed, which indicates that the project precipitation optimization scheme studied in this project is feasible.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.49
本文编号：2291694
[Abstract]:The excavation and dewatering project of Shenglian Island Crossing River Tunnel may affect the function of groundwater resources, lead to the decrease of groundwater level, may affect the natural and ecological environment in the area, and change the groundwater flow field system. Causes the lake water level to fall, the resident drinking water supply difficulty and so on question. Based on the engineering geological background and regional hydrogeological conditions, the preliminary design of the dewatering scheme for the cross-river tunnel project is carried out in this paper. Through the comparison and selection of engineering dewatering methods, the project selects the well point dewatering method for pipe wells, and designs the preliminary dewatering scheme according to its design principle. According to the different geological conditions, this paper divides the cross river tunnel into three sections to carry on the section design. Considering the interaction between the lake in Shenglian Island and the precipitation of the pipe well in this project during construction, the calculated value of the influence radius of LAK0 800~LAK0 1060 is 658m, and the influence radius is larger to the groundwater of the island and the inner lake. Therefore, the objective function is established by using the objective function method: the minimum sum of engineering cost and environmental and economic losses is taken as the objective function, and the water level in the foundation pit is lowered and the water output of a single well is taken as the constraint condition to solve the minimum precipitation well. The minimum pumping amount is used to optimize the precipitation scheme of the tunnel exit section, and the optimal precipitation well layout is predicted by numerical simulation method. The possible surface subsidence around the tunnel and the influence of regional groundwater resources are analyzed. The corresponding environmental protection measures for groundwater are put forward. The prediction of water level drop by Visual MODFLOW shows that the influence radius of precipitation scheme of this project is basically consistent with that calculated by Kuzagin's diving formula, which indicates that the precipitation scheme of this project is feasible. The optimized section of tunnel exit shows that the decrease of groundwater level along the direction of tunnel exit becomes slower, and the water level on both sides of vertical and tunnel exits is relatively large. The optimization of the scheme avoids the influence of precipitation in this tunnel section on the water level of the lake in Shenglian Island. The influence of well point precipitation on the surrounding groundwater environment is reduced to the greatest extent, and the trend of groundwater level decrease is changed, which indicates that the project precipitation optimization scheme studied in this project is feasible.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.49
【参考文献】
相关期刊论文 前10条
1 李存法,刘秀婷,从容;基坑截渗与降水工程优化设计方法浅析[J];地下水;2001年03期
2 韩传梅;陈喜;武永霞;;深基坑降水工程试验及降水方案设计[J];地下水;2007年06期
3 何小亮;王志硕;胡向阳;;西安地铁三号线某车站基坑降水设计[J];地下水;2011年01期
4 崔亚莉,邵景力,谢振华,贾汀;基于MODFLOW的地面沉降模型研究——以北京市区为例[J];工程勘察;2003年05期
5 滕凯，，柳宝田，张永亮;基坑井群降水的优化[J];工程勘察;1995年04期
6 瞿成松;张国强;罗建军;缪国建;;上海中心大厦基坑降水设计及实践[J];资源环境与工程;2011年03期
7 刘志敏;徐云峰;许艳杰;;基于目标函数法的基坑降水井群优化布置[J];建井技术;2006年02期
8 李友龙;董洪信;赵中省;;建筑工程深基坑降水方案设计——以江苏省徐塘电厂为例[J];地质学刊;2011年01期
9 张奉春;;基于数值模拟的基坑工程降水方案优化设计[J];价值工程;2011年16期
10 董明钢,杨峰;我国深基抗工程的现状和亟待解决的问题[J];建筑技术;2004年05期
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