基坑开挖降水对周围建筑物沉降影响研究.pdf

山东大学硕十学何论文摘要随着我国国民经济和城市建设的快速发展,土地资源紧张的矛盾R益突出, 为了有效地利用土地资源,城市地下空间的开发和高层建筑的发展迅速。相应地,基坑工程向大深度、大面积方向发展,而且,经常在密集的建筑群中施工, 场地狭窄,临近常有必须保护的永久性建筑和市政公用设施。因此,在基坑施工过程中,预测和控制基坑周围建筑物的变形是一项具有重要实际意义的研究课题。本文首先总结了深基坑工程降水和支护常用的方法并对其特点和适用范围作了简要的介绍。之后,在分析深基坑工程支护方案优化选型的原则和依据的基础上,阐述了多指标半结构模糊理论的基本原理,并将其应用到泰安国华时代项目中,实现了支护方案的优选。其次,以三维有限差分分析程序FLAC3D为计算工具,利用其流固耦合功能对基坑开挖降水进行了三维流固耦合模拟,以得到基坑周围建筑物在不同工况下的相关沉降规律。再次,对基坑工程中的实时监测理论进行了阐述,并对泰安国华时代项目周围建筑物的沉降监测进行了设计,编制了相应的监测数据处理软件,方便了数据的处理。最后,以泰安国华时代项目为背景,对该工程中基坑开挖降水对周围建筑物沉降的影响进行了三维流固祸合模拟和现场实时监测,将两者所得结果进行了比较分析,证明了FLAC3D程序的耦合模拟在基坑开挖降水引起周围建筑物沉降方面的可行性,并得到了相关的结论。软件关键词:基坑工程;周围建筑物沉降;三维流固耦合模拟;监测数据处理山东大学硕十学位论文 Abstract With therapiddevelopment ofNational Economy andUrban Constructive of our country,the conflict ofthe rare ofland sogrce isstanding outday byday,In order toutilizethe1andeffectively,advancement and exploitation ofunderground spaceand theconstruction ofhi曲一rise inurbandevelop rapidly Accordingly,the project offoundation pitgoes intoager e,it isgenerally surrounded bydense working space isvery narrow and there are always somepermanent construction andpub icservice which must beprotected. So itisimportant to forecast andcontrol the deformation of foundation pit’S surrounding buildings. Based on forepassed research,Ⅱle conlmonschemes of foundation pit dewatering andsupporting have been introduced firstly inthispaper,with tlleir thenbyanalyzing theprinciples and basis ofdeep foundation pit supporting type optimization selection,fuzzy multi—index semi-structural theory isdescribed and applied in the project of Taian toobtainthebestscheme. Secondly,with the help of the fluid-mechanical coupling function in 3-dimentional finitedifference program FLAC3D,the 3-dimentional coupling analysis on deep foundation excavation and dewatering iscarried out toanalyze settlement ofsurrounding buildings considering differentworking conditionsand somesettlement regularity isobtained. Thirdly,real