被动逆作法下框架节点变化的影响分析
发布时间：2018-12-11 09:58
【摘要】：基坑支护是深基坑工程的重要组成部分。近些年来,随着国家基础设施的大力推进与逐渐完善,基坑支护更是得到了快速的发展,各种适应基坑实际状况和要求的新支护技术不断涌现。而建筑基坑逆作法作为一种相对成熟的支护技术,由于其原理简单,加上社会和经济效益明显,在建筑相对密集的城市运用的越来越普及。因此,对深基坑逆作法的施工技术与结构分析进行系统研究,这对于基坑工程的发展具有重要的理论价值和现实意义。本文以贵州都匀福安凯莱大饭店基坑工程为背景,在支护桩已经施工完成后,由于锚杆施工不成功,被迫将原有桩锚支护方案改为采用逆作法,进行后续工程施工。逆作法施工中由于结构变动,导致车道由原来位置移动到最靠近支护桩的主体结构的边缘,使逆作法施工下荷载的传递对主体结构变得极为不利,在这种背景下本文做了以下主要研究与分析:(1)阐述基坑支护工程中逆作法的技术特点,并通过分析总结国内外的研究现状,说明该支护形式安全可靠、经济适用,有良好的应用前景。(2)对现场监测数据进行整理分析,重点研究了支护桩身的现场监测弯矩变化情况,由于方案改变导致桩身强度变化,我们用理正基坑设计软件对原桩锚支护方案进行分析,与现场监测对比拟合,分析桩身变形情况。(3)采用弹塑性有限元分析方法对框架节点变更前后基坑周围地表沉降值、支护桩的内力与变形、主体结构变动位置的框架内力与变形进行了数值仿真模拟与整体分析。(4)针对逆做法过程中遇到的节点位置变化,探究节点区刚度对框架性能的影响,并提出了对该部分框架柱强度和刚度的补强方案。
[Abstract]:Foundation pit support is an important part of deep foundation pit engineering. In recent years, with the national infrastructure vigorously promoted and gradually improved, foundation pit support has been rapid development, a variety of new support technology to adapt to the actual conditions and requirements of foundation pit has been emerging. As a relatively mature supporting technology, the inverse method of building foundation pit is more and more popular in cities with relatively dense buildings because of its simple principle and obvious social and economic benefits. Therefore, it is of great theoretical value and practical significance to study the construction technology and structure analysis of deep foundation pit inversion method, which is of great theoretical value and practical significance for the development of foundation pit engineering. Based on the foundation pit project of Caile Hotel in Duyun, Guizhou Province, after the construction of the supporting pile has been completed, because of the unsuccessful construction of the anchor rod, it is forced to change the original pile-anchor support scheme to the reverse method and carry out the subsequent construction. Because of the structural change in the reverse construction, the driveway moves from the original position to the edge of the main structure nearest to the supporting pile, which makes the load transfer under the reverse construction extremely unfavorable to the main structure. Under this background, this paper has done the following main research and analysis: (1) expound the technical characteristics of the inverse method in the foundation pit support engineering, and through the analysis and summary of the domestic and foreign research status, it is proved that the supporting form is safe and reliable, economical and applicable. It has a good application prospect. (2) the field monitoring data are analyzed, and the change of in-situ monitoring bending moment of the supporting pile body is studied, which results in the change of the pile strength due to the change of the scheme. We use the design software of Lizheng Foundation Pit to analyze the original pile-anchor support scheme, and compare with the field monitoring to analyze the deformation of the pile body. (3) using the elastic-plastic finite element analysis method to analyze the ground settlement value around the foundation pit before and after the change of the frame joint. The internal force and deformation of the supporting pile and the internal force and deformation of the frame of the main structure are numerically simulated and analyzed. (4) the change of the node position in the process of inverse method is analyzed. In this paper, the influence of the stiffness of the joint zone on the performance of the frame is investigated, and the reinforcement scheme of the strength and stiffness of the frame column is proposed.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753
本文编号：2372343
[Abstract]:Foundation pit support is an important part of deep foundation pit engineering. In recent years, with the national infrastructure vigorously promoted and gradually improved, foundation pit support has been rapid development, a variety of new support technology to adapt to the actual conditions and requirements of foundation pit has been emerging. As a relatively mature supporting technology, the inverse method of building foundation pit is more and more popular in cities with relatively dense buildings because of its simple principle and obvious social and economic benefits. Therefore, it is of great theoretical value and practical significance to study the construction technology and structure analysis of deep foundation pit inversion method, which is of great theoretical value and practical significance for the development of foundation pit engineering. Based on the foundation pit project of Caile Hotel in Duyun, Guizhou Province, after the construction of the supporting pile has been completed, because of the unsuccessful construction of the anchor rod, it is forced to change the original pile-anchor support scheme to the reverse method and carry out the subsequent construction. Because of the structural change in the reverse construction, the driveway moves from the original position to the edge of the main structure nearest to the supporting pile, which makes the load transfer under the reverse construction extremely unfavorable to the main structure. Under this background, this paper has done the following main research and analysis: (1) expound the technical characteristics of the inverse method in the foundation pit support engineering, and through the analysis and summary of the domestic and foreign research status, it is proved that the supporting form is safe and reliable, economical and applicable. It has a good application prospect. (2) the field monitoring data are analyzed, and the change of in-situ monitoring bending moment of the supporting pile body is studied, which results in the change of the pile strength due to the change of the scheme. We use the design software of Lizheng Foundation Pit to analyze the original pile-anchor support scheme, and compare with the field monitoring to analyze the deformation of the pile body. (3) using the elastic-plastic finite element analysis method to analyze the ground settlement value around the foundation pit before and after the change of the frame joint. The internal force and deformation of the supporting pile and the internal force and deformation of the frame of the main structure are numerically simulated and analyzed. (4) the change of the node position in the process of inverse method is analyzed. In this paper, the influence of the stiffness of the joint zone on the performance of the frame is investigated, and the reinforcement scheme of the strength and stiffness of the frame column is proposed.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753
【参考文献】
相关期刊论文 前10条
1 印长俊;阳文胜;马鹏远;;地铁基坑开挖对临近地下通道的影响规律研究[J];湖南工程学院学报(自然科学版);2016年02期
2 宋少云;尹芳;;有限元网格划分中的圣维南原理及其应用[J];机械设计与制造;2012年08期
3 王卫东;朱合华;李耀良;;城市岩土工程与新技术[J];地下空间与工程学报;2011年S1期
4 王志明;胡克旭;;钢筋混凝土框架节点受力机制及加固方法评述[J];工业建筑;2011年S1期
5 郭容宽;江云亮;葛春雷;;外包钢套与加大截面综合加固法的探讨[J];价值工程;2011年09期
6 余江滔;苏磊;陆洲导;张克纯;;玄武岩纤维加固震损三维混凝土框架节点抗震试验[J];同济大学学报(自然科学版);2011年01期
7 余江滔;陆洲导;张克纯;;震损钢筋混凝土框架节点修复后抗震性能试验研究[J];建筑结构学报;2010年12期
8 陆洲导;刘长青;张克纯;王焕杰;;外包钢套法加固钢筋混凝土框架节点试验研究[J];四川大学学报(工程科学版);2010年03期
9 张如林;徐奴文;;基于PLAXIS的深基坑支护设计的数值模拟[J];结构工程师;2010年02期
10 高俊合,赵维炳,周成;考虑固结、土-结构相互作用的基坑开挖有限元分析[J];岩土工程学报;1999年05期
相关硕士学位论文 前3条
1 邢旭亮;半逆作法深基坑设计与实践[D];南昌航空大学;2015年
2 金人杰;超大深基坑坑边逆作法施工技术的应用研究[D];同济大学;2007年
3 赵晓艳;新老混凝土机械连接结合性能研究[D];河北工业大学;2004年
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