深基坑开挖对近距离建筑的安全影响研究

发布时间：2018-07-09 10:57

本文选题：深基坑 + 邻近建筑　；参考：《中南大学》2014年硕士论文

【摘要】：随着城市的发展,深基坑开挖对周边环境的影响日益受到重视,如何有效控制基坑自身变形和对周边建筑的影响,使基坑工程既安全又经济,是人们一直探索的课题。本文以长沙市某隧道匝道基坑工程背景,结合施工现场实际水文地质、工程地质、岩土层物理力学参数等实地情况,对基坑开挖导致邻近建筑物受到开挖扰动影响进行了分析研究,研究内容如下： (1)首先对深基坑工程变形理论做了整理分析,对需要研究的匝道基坑及周围临近建筑的情况进行了综合分析,为数值模拟研究提供依据。 (2)综合阐述了工程施工过程中,针对施工过程中的基坑以及邻近基坑建筑物所进行的安全监测工作。通过参与工程监测,整理、统计并分析工程监测数据,初步得出邻近建筑物受到基坑开挖影响的规律,并提出了针对邻近基坑建筑物的保护措施。 (3)通过采用FLAC3D数值分析方法,对基坑及周边建筑进行虚拟建模,选取不同的土体加固进行模拟分析,并通过相互比较,得出土体加固措施在提高邻近基坑的建筑物安全性方面所起到的作用。 (4)基于理论研究和模拟分析的结论,采用基于融合权重的理想点法,构建建筑物安全评价模型。新的模型综合考虑了建筑物位移变形状态、基坑与建筑之间土体的扰动程度和建筑物地基的抗扰动能力。
[Abstract]:With the development of city, more and more attention has been paid to the influence of deep foundation pit excavation on the surrounding environment. How to effectively control the deformation of the foundation pit and the influence on the surrounding buildings to make the foundation pit project safe and economical is a subject that people have been exploring all the time. In this paper, based on the engineering background of a tunnel ramp foundation pit in Changsha City, combined with the actual hydrogeology, engineering geology, physical and mechanical parameters of rock and soil layer and so on, The influence of excavation disturbance on adjacent buildings caused by foundation pit excavation is analyzed. The research contents are as follows: (1) the deformation theory of deep foundation pit engineering is analyzed firstly. This paper makes a comprehensive analysis of the conditions of the ramp foundation pit and adjacent buildings which need to be studied, which provides the basis for the numerical simulation study. (2) the construction process of the project is comprehensively expounded. The safety monitoring work is carried out for the foundation pit and adjacent foundation pit buildings during the construction process. By taking part in engineering monitoring, collation, statistics and analysis of engineering monitoring data, the law that adjacent buildings are affected by excavation of foundation pit is preliminarily obtained. The protection measures for adjacent foundation pit buildings are put forward. (3) by using FLAC3D numerical analysis method, virtual modeling of foundation pit and surrounding buildings is carried out, and different soil reinforcement is selected to simulate and analyze each other. The effect of soil reinforcement on building safety of adjacent foundation pit is obtained. (4) based on the conclusion of theoretical research and simulation analysis, an ideal point method based on fusion weight is adopted to construct a building safety evaluation model. The new model takes into account the displacement and deformation of the building, the disturbance degree of soil between foundation pit and building and the anti-disturbance ability of building foundation.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU753

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