96例心内膜弹力纤维增生症患儿转归及影响因素的研究

发布时间：2018-06-17 00:49

本文选题：基坑支护 + 变形控制　；参考：《吉林大学》2012年硕士论文

【摘要】：随着社会经济的不断发展,城市建筑物的高度持续增加,使得基坑工程的开挖深度越来越大,并且由于场地条件狭窄,周围建筑物密集,又有地下管线,这对基坑的稳定性和变形的要求越来越高。因此近考虑强度和稳定性的基坑设计方法已很难满足复杂环境下基坑的设计和施工的要求,在许多工程需要以变形为主要控制条件。深基坑工程的施工会使基坑周围土体产生位移、坑底土体出现隆起、周边地表产生沉降等变形,变形值过大将会引起基坑失稳或危及周围建筑物、地下管线等。所以在基坑工程施工前进行较为准确的变形预测分析,对可能出现过大变形的位置进行加固,是避免这些事故发生的较为有益的方法。论文以长春市国际金融中心基坑工程为背景,针对具体的工程条件和场地工程地质条件,在分析各类支护结构特点的基础上,提出了适用于该工程施工的的基坑支护方案、降水方案,并进行了支护结构的详细设计计算、稳定性分析。采用大型岩土有限元软件Plaxis对实际工程采用分部开挖完成后的水平位移场及竖向位移场进行了数值模拟,并将计算结果与实际监测结果进行了对比分析。特别是对基坑开挖完成后周边地表沉降变形及坑壁土体水平变形的分布规律进行了比较研究。成果可为该地区同类工程提供参考。
[Abstract]:With the continuous development of social economy, the height of urban buildings increases continuously, which makes the excavation depth of foundation pit more and more deep, and because of the narrow site conditions, the surrounding buildings are dense, and there are underground pipelines. The requirement of stability and deformation of foundation pit is higher and higher. Therefore, it is difficult to meet the requirements of foundation pit design and construction in complex environment, and deformation is the main control condition in many projects. The construction of deep foundation pit works will cause the displacement of soil around the foundation pit, the uplift of the soil in the bottom of the pit, the settlement of the surrounding surface, and so on. If the deformation value is too large, the foundation pit will lose stability or endanger the surrounding buildings, underground pipelines and so on. Therefore, it is a useful method to avoid these accidents by making accurate deformation prediction analysis before foundation pit engineering construction and strengthening the position where there may be excessive deformation. Based on the foundation pit engineering of Changchun International Financial Center, and in view of the specific engineering conditions and site engineering geological conditions, and on the basis of analyzing the characteristics of various kinds of supporting structures, the paper puts forward a foundation pit supporting scheme suitable for the construction of this project. The detailed design calculation and stability analysis of the supporting structure are carried out. The horizontal displacement field and vertical displacement field after partial excavation were simulated by finite element software Plaxis, and the calculated results were compared with the actual monitoring results. Especially, the distribution of ground surface settlement and horizontal deformation of pit wall after excavation is compared. The results can provide reference for similar projects in this area.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：R725.4

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