上海市综合体项目基坑及周边环境监测分析

发布时间：2018-02-28 06:45

本文关键词： 城市综合体基坑工程变形监测沉降支撑轴力　出处：《湖北工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：城镇化速度的提高、经济的发展使得城市土地资源相对紧缺,因此为获得更大的收益和面积利用率,越来越多的项目开始向地下空间进行发展。尤其对于城市而言,深基坑工程常处在密集的道路桥梁、交通管线、既有建筑和人防工程附近,虽然是临时施工,但其技术复杂性远非永久性的基础结构和上部构造所能比拟,稍不注意,便会造成严重的损害后果,在危害深基坑本身安全的同时还会对后续工程的安全性埋下潜藏着的祸患,更有甚者,还会祸及临近的其他地下设施、构筑物以及道路桥梁等。因此,必须对基坑工程的安全施工要求越来越严格,尤其是在施工过程中对基坑围护结构和周边环境的观测上,动态的监测可以真实地反映基坑施工过程中的变形状况,及时帮助施工方了解施工效果,保证基坑的施工安全。本论文首先分析基坑工程的主要特点,指出了我国基坑施工存在的问题和发展趋势。在此基础上,提出了论文研究的主要内容和方法以及研究的意义,并以上海市城市综合体基坑工程项目为背景,阐述了基坑工程的施工方案、支护体系和基坑周边环境状况,基于上海市城市综合体项目基坑工程施工安全及对周围环境影响的监测方案进行了深入探讨,利用现场监测的数据,进行有效整理,从而将支护结构水平位移、支撑轴力、竖向位移、地表及周边沉降及地下水位随时间变化的时程曲线图绘制出来,并且分别对各个监测项目的监测数据进行了分析总结。现场监测结果表明,基坑开挖过程中,内支撑所处的位置和基坑的开挖深度与支护结构水平位移的大小联系十分密切。在基坑开挖期间,地表呈现出具有一定的空间效应的沉降变化,其特点是两侧的沉降量较小,而中部的沉降量则较大。坡顶沉降较墙顶及周边沉降大,整体沉降监测结果表明,基坑开挖期间地表和建筑物沉降均未超过警戒值,基坑工程施工的动态监控有效的保证了基坑工程的安全。
[Abstract]:With the increase of urbanization speed and the development of economy, urban land resources are relatively scarce, so more and more projects begin to develop into underground space in order to obtain greater income and area utilization ratio, especially for cities. Deep foundation pit works are often located in the vicinity of dense roads, bridges, traffic pipelines, existing buildings and civil air defense projects. Although they are temporary construction, their technical complexity is far from being comparable to permanent infrastructure and superstructures. It will result in serious damage, endangering the safety of the deep foundation pit itself, and at the same time burying hidden hazards in the safety of the subsequent projects, and, worse, other underground facilities nearby. Therefore, it is necessary to make more and more strict requirements for the safe construction of foundation pit engineering, especially in the observation of the surrounding structure and surrounding environment of the foundation pit during the construction process. Dynamic monitoring can truly reflect the deformation during foundation pit construction, help the construction side to understand the construction effect and ensure the construction safety in time. This paper first analyzes the main characteristics of foundation pit engineering. The problems and development trend of foundation pit construction in China are pointed out. On the basis of this, the main contents, methods and significance of the research are put forward, and the background of the foundation pit engineering project of Shanghai urban complex is presented. The construction scheme, supporting system and surrounding environment of foundation pit are expounded. Based on the safety of foundation pit construction of Shanghai City complex Project and the monitoring scheme of its impact on the surrounding environment, this paper makes a deep discussion on the construction safety of the foundation pit and the monitoring scheme of its impact on the surrounding environment. Based on the monitoring data, the time history curves of horizontal displacement, support axial force, vertical displacement, surface and surrounding subsidence and groundwater level change with time are plotted out. And the monitoring data of each monitoring project are analyzed and summarized respectively. The field monitoring results show that during the excavation of foundation pit, The position of the inner support and the excavation depth of the foundation pit are closely related to the horizontal displacement of the supporting structure. During the excavation of the foundation pit, the ground surface presents a certain spatial effect of settlement change, which is characterized by the small settlement on both sides. The settlement of the middle part of the slope is larger than that of the top of the wall and the surrounding settlement. The result of the whole settlement monitoring shows that the settlement of the ground surface and the building is not over the warning value during the excavation of the foundation pit. The dynamic monitoring of foundation pit construction effectively ensures the safety of foundation pit engineering.
【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

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