西安湿陷性黄土地区高层建筑物沉降特性分析研究

发布时间：2018-12-15 02:10

【摘要】：现代城市的建筑主体越来越趋于复杂化、高耸化,随之而来的就是建筑物自身在建设和使用过程中的严重沉降问题,通常建筑物的沉降量介于可控范围内时认为这是一种正常现象,不过一旦超过允许变形值,那么就会对建筑物自身造成严重的损害,危及建筑和人员安全。因此,在建筑物建设和使用过程中,对其进行常规化、周期化的沉降监测成为工程建设一项必不可少的工作,它可以通过监测和分析了解建筑物的变化情况和工作状态,宏观上实时向管理决策者提供准确的信息,确保建筑物的安全建设和使用。本文选取地处关中平原的西安地区为研究区域,针对研究区所处的湿陷性黄土地质条件,以2004年-2013年西安地区的高层建筑物为研究对象,通过对200多幢高层住宅的沉降观测资料的分析,论述了湿陷性黄土地区建筑物沉降观测的方法、精度要求及数据的处理与分析过程,从沉降量、沉降速率、不均匀沉降差等建筑物沉降观测的主要分析指标出发,基于城南、城北、城东、城西四大区域不同的地质条件,研究了西安地区高层建筑物的长期沉降特性,并根据建筑物从基坑开挖-主体封顶-投入使用这一过程中不同阶段的沉降发展规律,利用指数曲线沉降模型估测建筑物的最终稳定沉降量,以数学统计分析方法得出建筑物不均匀沉降差的分布情况,最后得到了高层建筑物在不同时间节点上累积沉降量和不均匀沉降差的稳定控制值和预警值,为陕西省地方标准《湿陷性黄土地区变形监测规范》中建筑物沉降观测和预警工作内容的编制提供了理论依据。
[Abstract]:The main body of modern city buildings tend to become more and more complex, towering, followed by the building itself in the process of construction and use of the serious settlement problem, Usually, the settlement of buildings is considered to be a normal phenomenon when the settlement is within a controllable range, but once the allowable deformation is exceeded, it will cause serious damage to the building itself and endanger the safety of buildings and personnel. Therefore, in the process of building construction and use, regular and periodic settlement monitoring has become an essential work of engineering construction, which can be monitored and analyzed to understand the changes and working conditions of buildings. Macro-real-time to provide management decision-makers with accurate information to ensure the safe construction and use of buildings. In this paper, Xi'an area, which is located in Guanzhong Plain, is selected as the study area. Aiming at the collapsible loess geological conditions in the study area, the high-rise buildings in Xi'an from 2004 to 2013 are taken as the research object. Based on the analysis of settlement observation data of more than 200 high-rise residential buildings, this paper discusses the methods, accuracy requirements and data processing and analysis process of building settlement observation in collapsible loess area. Based on the different geological conditions in the south, north, east and west of the city, the long-term settlement characteristics of the high-rise buildings in Xi'an are studied. The final stable settlement of the building is estimated by exponential curve settlement model according to the law of settlement development in different stages in the process of excavation of foundation pit, capping of the main body and putting into use, and the model of exponential curve settlement is used to estimate the final stable settlement of the building. The distribution of uneven settlement difference of buildings is obtained by means of mathematical statistical analysis. Finally, the stable control value and early warning value of cumulative settlement and uneven settlement difference on different time nodes of high-rise buildings are obtained. It provides a theoretical basis for the compilation of the contents of building settlement observation and early warning in the local standard "deformation Monitoring Code for collapsible Loess areas" in Shaanxi Province.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU433

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