区域降水对周边环境的影响
发布时间：2018-07-29 10:07
【摘要】：随着我国经济建设的不断发展和工程技术的日益成熟,许多城市正在开展“城市双中心”的建设,力求打造经济、娱乐、文化等多重元素集合的综合发展区,大型的基坑建筑群不断涌现,工程建设的范围在持续扩大。为了保证基坑施工过程中具有干作业面,避免发生流砂、坑底突涌等危险,将根据场地的水文地质情况选择合适的降水方式进行基坑降水。基坑降水必然会引起基坑周围地下水环境的改变,目前,许多工程设计和研究人员展开了关于基坑降水对周边环境影响的研究,也取得了一些成果,但是当基坑开挖的深度和广度加大,工程的建设周期延长,多个基坑同时施工时,我们所面临的基坑降水问题将是区域性的。区域大面积降水所引发的环境问题已经引起了人们的重视,其影响主要包括水环境的影响和地面不均匀沉降影响,针对这一课题,本文以天津市于家堡金融建设区为依托,采用Modflow地下水三维数值模拟软件进行了各种不同工况的模拟,研究区域降水对周边环境的影响。根据于家堡金融起步区一期基坑的实际降水设计,分别模拟了基坑内一个区域单独降水、两个区域同时降水、三个区域同时降水这三种工况,从模拟结果进行环境影响的探讨。而后进行了两个大型基坑同时进行基坑降水的环境影响分析,根据模拟结果,可以看出当多个基坑同时进行降水施工时,会形成大面积的区域降水,对周边环境的影响范围和程度会随着降深和抽水量的增加而扩大,使水资源大量流失并且造成地面的不均匀沉降。为了控制区域大面积降水对周边环境的影响,应采取一定的控水措施。采用数值模拟软件分析了三种控水措施的作用,分别为止水帷幕的作用、降水井布置方式的影响、设置回灌井的作用。实际上,控水措施的目的是在保证基坑工程能够顺利展开的前提下,使其对环境的扰动最小,一方面保证了周围建筑物和地下管线的安全,另一方面节约了水资源,既完成了经济建设的要求,又做到了环境保护,以利于长久发展。从模拟结果可以看出,如果在开展基坑降水时采取相应的控水措施,其对周边环境的影响深度和广度要远小于不采取控水措施,并且这三种不同的控水措施各有其特点和优势,在降低环境影响上有不同程度的效果。在实际工程中,可以根据地区的特点和工程要求,进行综合分析,从而采取既有效又经济的控水措施,保证基坑施工的顺利进行并且使环境影响降到最低,达到经济建设和环境保护双赢的目的。
[Abstract]:With the continuous development of economic construction and the maturation of engineering technology in our country, many cities are carrying out the construction of "urban dual centers" in order to create a comprehensive development area with multiple elements, such as economy, entertainment, culture, etc. Large-scale foundation pit buildings continue to emerge, the scope of engineering construction continues to expand. In order to ensure the dry working surface during foundation pit construction and avoid the danger of quicksand and outburst of pit bottom, the proper dewatering method will be selected according to the hydrogeological conditions of the site. Foundation pit dewatering will inevitably lead to the change of groundwater environment around the foundation pit. At present, many engineering designers and researchers have carried out research on the impact of foundation pit dewatering on the surrounding environment, and some achievements have been made. However, when the excavation depth and width of foundation pit are enlarged, the construction period is prolonged, and several foundation pits are constructed at the same time, the problem of foundation pit dewatering will be regional. The environmental problems caused by regional precipitation have attracted people's attention, which mainly include the influence of water environment and uneven subsidence of the land. In view of this problem, this paper relies on the financial construction area of Tianjin Yujiabu. The effects of regional precipitation on the surrounding environment were studied by using Modflow three-dimensional numerical simulation software of groundwater in various working conditions. According to the actual dewatering design of the first foundation pit in Yujiabu financial starting area, the paper simulates the three conditions of single precipitation in one area, simultaneous precipitation in two regions and simultaneous precipitation in three regions, respectively. The environmental impact is discussed from the simulation results. Based on the simulation results, it can be seen that when several foundation pits are constructed simultaneously, a large area of dewatering will be formed. The range and degree of influence on the surrounding environment will expand with the increase of the depth and pumping capacity, resulting in a large loss of water resources and the uneven settlement of the land. In order to control the influence of large area precipitation on the surrounding environment, some water control measures should be taken. The effects of three kinds of water control measures are analyzed by using numerical simulation software. They are the function of water stop curtain, the influence of precipitation well layout, and the function of setting up recharge well. In fact, the purpose of the water control measures is to minimize the disturbance to the environment on the premise that the foundation pit works can be carried out smoothly, on the one hand to ensure the safety of the surrounding buildings and underground pipelines, and on the other hand, to save water resources. Not only has completed the economic construction request, also has achieved the environmental protection, in order to benefit the long-term development. From the simulation results, it can be seen that if the corresponding water control measures are taken in the dewatering of foundation pit, the depth and breadth of the impact on the surrounding environment are much smaller than those without the water control measures, and each of the three water control measures has its own characteristics and advantages. In reducing the environmental impact has varying degrees of effect. In the actual engineering, comprehensive analysis can be carried out according to the characteristics of the area and the engineering requirements, so as to take effective and economical water control measures to ensure the smooth construction of the foundation pit and minimize the environmental impact. To achieve a win-win economic construction and environmental protection purposes.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU753.66
本文编号：2152337
[Abstract]:With the continuous development of economic construction and the maturation of engineering technology in our country, many cities are carrying out the construction of "urban dual centers" in order to create a comprehensive development area with multiple elements, such as economy, entertainment, culture, etc. Large-scale foundation pit buildings continue to emerge, the scope of engineering construction continues to expand. In order to ensure the dry working surface during foundation pit construction and avoid the danger of quicksand and outburst of pit bottom, the proper dewatering method will be selected according to the hydrogeological conditions of the site. Foundation pit dewatering will inevitably lead to the change of groundwater environment around the foundation pit. At present, many engineering designers and researchers have carried out research on the impact of foundation pit dewatering on the surrounding environment, and some achievements have been made. However, when the excavation depth and width of foundation pit are enlarged, the construction period is prolonged, and several foundation pits are constructed at the same time, the problem of foundation pit dewatering will be regional. The environmental problems caused by regional precipitation have attracted people's attention, which mainly include the influence of water environment and uneven subsidence of the land. In view of this problem, this paper relies on the financial construction area of Tianjin Yujiabu. The effects of regional precipitation on the surrounding environment were studied by using Modflow three-dimensional numerical simulation software of groundwater in various working conditions. According to the actual dewatering design of the first foundation pit in Yujiabu financial starting area, the paper simulates the three conditions of single precipitation in one area, simultaneous precipitation in two regions and simultaneous precipitation in three regions, respectively. The environmental impact is discussed from the simulation results. Based on the simulation results, it can be seen that when several foundation pits are constructed simultaneously, a large area of dewatering will be formed. The range and degree of influence on the surrounding environment will expand with the increase of the depth and pumping capacity, resulting in a large loss of water resources and the uneven settlement of the land. In order to control the influence of large area precipitation on the surrounding environment, some water control measures should be taken. The effects of three kinds of water control measures are analyzed by using numerical simulation software. They are the function of water stop curtain, the influence of precipitation well layout, and the function of setting up recharge well. In fact, the purpose of the water control measures is to minimize the disturbance to the environment on the premise that the foundation pit works can be carried out smoothly, on the one hand to ensure the safety of the surrounding buildings and underground pipelines, and on the other hand, to save water resources. Not only has completed the economic construction request, also has achieved the environmental protection, in order to benefit the long-term development. From the simulation results, it can be seen that if the corresponding water control measures are taken in the dewatering of foundation pit, the depth and breadth of the impact on the surrounding environment are much smaller than those without the water control measures, and each of the three water control measures has its own characteristics and advantages. In reducing the environmental impact has varying degrees of effect. In the actual engineering, comprehensive analysis can be carried out according to the characteristics of the area and the engineering requirements, so as to take effective and economical water control measures to ensure the smooth construction of the foundation pit and minimize the environmental impact. To achieve a win-win economic construction and environmental protection purposes.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU753.66
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