【作者】 陈林；

【导师】 倪修全；

【作者基本信息】 安徽理工大学 ， 建筑与土木工程（专业学位）， 2022， 硕士

【摘要】 随着我国城市不断发展,城市人口不断增加,城市交通拥堵的现象时有发生。为解决人们出行困难,缓解交通压力,优化城市用地,近些年来建筑物高度不断上升,地下工程、地下商业交通综合体、城市轨道交通等的大力发展正在不断的解决这一难题。因此城市深基坑工程也越来越多,由于深基坑工程大多应用于高层建筑及地下工程,其地理位置大多位于城市繁华和中心地带,周边环境复杂,因此深基坑工程的施工难度不断加大,施工工序变得越来越复杂,在保证深基坑自身稳定性的情况下,还要保证对邻近建筑物的影响在安全范围内。因此对深基坑工程进行全面系统的研究,采取科学合理的施工方法,减小基坑自身结构对邻近建筑物的影响具有重要的现实意义。本文通过对广州某在建地铁深基坑工程的研究,探讨内容如下:(1)通过工程现场地质、水文、地下管线、周围建构筑物的勘探报告和工程概况,介绍了基坑支护的基本类型和施工开挖方法,分析了施工时基坑的工程风险以及对邻近建筑物的影响。(2)在保证深基坑工程正常施工的情况下,通过对深基坑支护施工和开挖方案的讨论,以及现场基坑监测的数据分析,结合MIDAS GTS NX有限元软件等进行模拟分析,证明基坑整体稳定性和抗倾覆稳定性满足要求,证明方案是可行的。(3)通过研究和分析编制了深基坑施工应急预案,增加了对邻近建筑物的保护和加固措施,并在深基坑的施工过程中,实时监测基坑变形情况、地下水位下降情况,基坑周边地面沉降情况,通过监测数据与数值模拟数据进行对比,验证数值模拟的可靠性。图[49]表[10]参[5]更多还原

【Abstract】 With the continuous development of China’s cities,the urban population continues to increase,and the phenomenon of urban traffic congestion occurs from time to time.In order to solve people’s travel difficulties,alleviate traffic pressure,and optimize urban land,the height of buildings has been rising in recent years,and the vigorous development of underground engineering,underground commercial transportation complexes,and urban rail transit is constantly solving this problem.Therefore,there are more and more urban deep foundation pit projects,because deep foundation pit projects are mostly used in high-rise buildings and underground projects,its geographical location is mostly located in the bustling and central area of the city,the surrounding environment is complex,so the construction difficulty of deep foundation pit engineering continues to increase,the construction process becomes more and more complex,in the case of ensuring the stability of the deep foundation pit itself,it is also necessary to ensure that the impact on adjacent buildings is within the safe range.Therefore,it is of great practical significance to conduct a comprehensive and systematic study of the deep foundation pit project,adopt scientific and reasonable construction methods,and reduce the impact of the foundation pit’s own structure on the adjacent buildings.Through the study of a deep foundation pit project of a subway under construction in Guangzhou,this paper discusses the following contents:(1)Through the exploration report and engineering overview of the geology,hydrology,underground pipeline and surrounding structures at the project site,the basic types of foundation pit support and construction excavation scheme are introduced,and the engineering risks of foundation pits during construction and the impact on adjacent buildings are analyzed.(2)Under the condition of ensuring the normal construction of the deep excavation project,through the discussion of the support construction and excavation scheme of the deep excavation pit,as well as the data analysis of the on-site excavation monitoring,combined with midas GTS NX finite element software,etc.,it is proved that the overall stability and anti-overturning stability of the pit meet the requirements and prove that the scheme is feasible.(3)Through research and analysis,the emergency plan for the construction of deep foundation pits was compiled,the protection and reinforcement measures for adjacent buildings were added,and in the construction process of deep foundation pits,the deformation of foundation pits,the decline of groundwater level,and the ground settlement around the foundation pits were monitored in real time,and the reliability of numerical simulations was verified by comparing the monitoring data with numerical simulation data.Figure [49] Table [10] Reference [5]更多还原