基坑降水开挖对邻近建筑物沉降的分析研究

发布时间：2019-05-18 13:48

【摘要】：近几年来我国社会经济持续快速发展,城市化建设进程逐步深入,工程项目也不断增多,新建筑物之间越来越密集,并且城市地下水位相对较浅,新建筑项目需要深挖基坑。其中涉及到基坑降水、基坑开挖对周围建筑物形成的影响,相关问题严重十分严重必须要引起重视。虽然基坑降水能够为基坑开挖提供更便利的条件,但与此同时也会导致周围土体支护结构以及水压力之间发生变化,并且降水极可能会导致基坑渗流,极可能会引发流砂、流土等现象,严重时将会导致周围建筑发生沉降。结合以上所述能够了解到新建筑工程开挖基坑以及基坑降水方面必须要引起重视。文章主要切合某建筑项目工程基坑事故案例围绕基坑降水以及基坑开挖对周围教学楼过量沉降方面展开大量研究与分析工作,具体为:通过对地下水在土体中发生的运移变化展开全面研究与分析,与此同时围绕地下水对土体支护结构起到的作用以及水、土之间的相互作用展开全面分析,进一步通过工程实例展开分析,确定基坑降水产生的降落漏斗范围。通过对新建工程基坑降水对周围土体结构引起的沉降情况予以全面分析,并结合相关理论对周围土层结构沉降差异性展开全面计算,并在土体固结过程应力是否发生变化以及变化造成的影响展开全面分析,最终落实新建工程基坑降水对周围地面造成沉降规律。根据实际案例基坑项目3-3单元施工材料,进一步全面分析地下水位以及周围变形监测数据。通过将理论计算方式以及软件计算方式相结合,从中得出了基坑开挖以及基坑降水实际对周围教学楼造成的沉降现象及其规律,进一步展开对基坑开挖以及基坑降水对土层沉降的时间效应以及空间效应展开全面分析。通过实现基坑工程数据模型的构建,继而展开更为全面而深入的分析,其中主要引用的构建软件为FLAC3D数值模拟软件。其中通过数据模型的构建后分别围绕基坑开挖引起的周围建筑物变形数据以及基坑降水引起的周围建筑物变形数据展开全面分析,同时围绕基坑降水以及基坑开挖同一时间进行时得出的建筑物变形数据与实际检测的建筑物变形数据之间的关系展开全面分析,最终得出同时展开基坑开挖以及基坑降水得出的建筑物变形数据与实际检测数据趋同。为此针对基坑设计的计算方面理应要结合基坑降水以及基坑开挖同时考虑周围环境。
[Abstract]:In recent years, China's social economy continues to develop rapidly, the process of urbanization construction is gradually deepening, engineering projects are also increasing, new buildings are becoming more and more dense, and the urban groundwater level is relatively shallow, new construction projects need to dig deep foundation pit. Among them, the influence of foundation pit excavation on the formation of surrounding buildings is related to the dewatering of foundation pit, and the related problems must be paid attention to. Although foundation pit dewatering can provide more convenient conditions for foundation pit excavation, at the same time, it will also lead to changes between surrounding soil supporting structure and water pressure, and precipitation is likely to lead to foundation pit seepage, which is likely to lead to sand flow. The phenomenon of flowing soil and so on will lead to the settlement of the surrounding buildings when it is serious. Combined with the above, we can understand that the excavation of foundation pit and the dewatering of foundation pit must be paid attention to. This paper is mainly suitable for the case of foundation pit accident in a construction project. A lot of research and analysis work is carried out around the dewatering of foundation pit and the excessive settlement of surrounding teaching buildings by foundation pit excavation. Through the comprehensive study and analysis of the movement and change of groundwater in soil, at the same time, the function of groundwater on soil supporting structure and the interaction between water and soil are comprehensively analyzed. Further through the analysis of engineering examples, the range of falling funnel produced by foundation pit dewatering is determined. Based on the comprehensive analysis of the settlement caused by the dewatering of the foundation pit of the new project, and combined with the relevant theories, the settlement difference of the surrounding soil layer structure is calculated in an all-round way. In the process of soil consolidation, whether the stress changes and the influence caused by the change is analyzed comprehensively, and finally the settlement law of foundation pit dewatering caused by foundation pit dewatering in the new project is carried out. According to the construction materials of the third unit of the foundation pit project, the groundwater level and the monitoring data of the surrounding deformation are further analyzed in an all-round way. By combining the theoretical calculation method with the software calculation method, the settlement phenomenon and its law caused by foundation pit excavation and foundation pit dewatering to the surrounding teaching building are obtained. Furthermore, the temporal and spatial effects of foundation pit excavation and foundation pit dewatering on soil settlement are analyzed comprehensively. Through the construction of foundation pit engineering data model, and then carry out a more comprehensive and in-depth analysis, in which the main reference construction software is FLAC3D numerical simulation software. After the construction of the data model, the deformation data of the surrounding buildings caused by foundation pit excavation and the deformation data of the surrounding buildings caused by foundation pit dewatering are analyzed comprehensively. At the same time, the relationship between the deformation data of the building and the deformation data of the building detected by the dewatering of the foundation pit and the excavation of the foundation pit at the same time is analyzed comprehensively. Finally, it is concluded that the deformation data of the building obtained from the simultaneous development of foundation pit excavation and foundation pit dewatering are the same as the actual detection data. Therefore, the calculation of foundation pit design should be combined with foundation pit dewatering and foundation pit excavation, and the surrounding environment should be considered at the same time.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753;TU196.2

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