深基坑环梁支撑结构体系优化设计与受力分析
发布时间：2018-07-14 17:58
【摘要】：深基坑环梁支撑支护结构是近年来基坑工程中出现的一种新型支护形式,相比于其他支护形式,环梁支护结构具有安全、经济、便于拆除等优点。近年来我国对环梁支撑结构形式的研究和应用有了很大的进展,但仍存在诸多不足,在一定程度上限制了该结构的广泛应用。本文在总结深基坑环梁内支撑支护结构体系研究现状的基础上,结合镇江地区黄浦置业基坑工程实例对环梁支撑体系的布置形式、不同挖土工况下支护结构的受力变形以及环梁拆撑方案开展系统研究。主要研究内容包括以下几个方面:(1)阐述深基坑环梁内支撑支护结构的研究现状,介绍环梁支撑结构的特点、构造以及平面布置形式。(2)阐明环梁支撑优化设计的目的及意义,依托基坑工程实例,利用有限元软件BSC对环梁支撑结构体系建立不同内支撑结构模型,通过对比分析有限元计算结果,按照变形最小的原则,确定最佳布撑方案,总结深基坑环梁支撑选型和计算的基本方法。(3)采用数值模拟软件MIDAS-GTS建立基坑三维空间有限元模型,针对分层均匀挖土、分块挖土两种开挖模式进行模拟分析,结果表明采用分层均匀挖土施工,可以有效降低围护结构的变形,土方不均衡开挖会导致基坑处于非对称受力状态,使支撑体系受力不均匀,变形增大,威胁基坑安全。最终确定采用分层均匀挖土方案。(4)针对环梁支撑体系主要构件环梁、辐射杆、连系梁设定不同的拆撑顺序,采用MIDAS-GTS建模计算不同顺序下支撑结构的变形,计算结果表明先拆连系杆,然后拆辐射杆,最后拆环梁的情况下变形最小,且拆撑遵循对称拆撑原则。另外,对三种常用的拆撑施工工艺进行对比分析,确定采用混凝土静音切割拆撑方案。现场监测结果表明,终选拆撑顺序及拆撑工艺能满足工程要求,可供今后类似工程参考。
[Abstract]:The ring beam bracing structure of deep foundation pit is a new type of supporting form in foundation pit engineering in recent years. Compared with other supporting forms, the ring beam supporting structure has the advantages of safety, economy and easy to remove. In recent years, great progress has been made in the research and application of ring beam bracing structure in China, but there are still many shortcomings, which limits the wide application of the structure to some extent. On the basis of summing up the present situation of the research on the bracing structure system of the ring beam in deep foundation pit, the layout of the bracing system of the ring beam is discussed in combination with the example of the foundation pit of Huangpu property in Zhenjiang area. The mechanical deformation of supporting structure and the supporting scheme of ring beam under different excavation conditions were studied systematically. The main research contents include the following aspects: (1) the present research situation of the bracing structure of ring beam in deep foundation pit is described, and the characteristics, structure and layout of the bracing structure of ring beam are introduced. (2) the purpose and significance of optimum design of ring beam bracing are expounded. Based on the example of foundation pit engineering, using the finite element software BSC to establish different internal bracing structure models for ring beam bracing structure system, by comparing and analyzing the results of finite element calculation, according to the principle of minimum deformation, the best bracing scheme is determined. The basic methods for selection and calculation of ring beam braces in deep foundation pit are summarized. (3) Three-dimensional finite element model of foundation pit is established by using MIDAS-GTS software. The results show that the layered and uniform excavation can effectively reduce the deformation of the retaining structure, and the uneven excavation of the earth will cause the foundation pit to be in a state of asymmetric force, which will make the bracing system unevenly loaded, the deformation increase, and threaten the safety of the foundation pit. Finally, the layered uniform excavation scheme is adopted. (4) for the main components of ring beam support system, ring beam, radiation rod and connecting beam are set up in different supporting order, and MIDAS-GTS model is used to calculate the deformation of bracing structure in different order. The calculation results show that the tie bar is removed first, then the radiation rod is removed, and the deformation is minimized when the ring beam is finally removed, and the support removal follows the principle of symmetrical bracing. In addition, by comparing and analyzing the three common construction techniques, the concrete silent cutting and bracing scheme is determined. The results of field monitoring show that the order and process of final selection and removal of bracing can meet the engineering requirements and can be used as reference for similar projects in the future.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753
本文编号：2122503
[Abstract]:The ring beam bracing structure of deep foundation pit is a new type of supporting form in foundation pit engineering in recent years. Compared with other supporting forms, the ring beam supporting structure has the advantages of safety, economy and easy to remove. In recent years, great progress has been made in the research and application of ring beam bracing structure in China, but there are still many shortcomings, which limits the wide application of the structure to some extent. On the basis of summing up the present situation of the research on the bracing structure system of the ring beam in deep foundation pit, the layout of the bracing system of the ring beam is discussed in combination with the example of the foundation pit of Huangpu property in Zhenjiang area. The mechanical deformation of supporting structure and the supporting scheme of ring beam under different excavation conditions were studied systematically. The main research contents include the following aspects: (1) the present research situation of the bracing structure of ring beam in deep foundation pit is described, and the characteristics, structure and layout of the bracing structure of ring beam are introduced. (2) the purpose and significance of optimum design of ring beam bracing are expounded. Based on the example of foundation pit engineering, using the finite element software BSC to establish different internal bracing structure models for ring beam bracing structure system, by comparing and analyzing the results of finite element calculation, according to the principle of minimum deformation, the best bracing scheme is determined. The basic methods for selection and calculation of ring beam braces in deep foundation pit are summarized. (3) Three-dimensional finite element model of foundation pit is established by using MIDAS-GTS software. The results show that the layered and uniform excavation can effectively reduce the deformation of the retaining structure, and the uneven excavation of the earth will cause the foundation pit to be in a state of asymmetric force, which will make the bracing system unevenly loaded, the deformation increase, and threaten the safety of the foundation pit. Finally, the layered uniform excavation scheme is adopted. (4) for the main components of ring beam support system, ring beam, radiation rod and connecting beam are set up in different supporting order, and MIDAS-GTS model is used to calculate the deformation of bracing structure in different order. The calculation results show that the tie bar is removed first, then the radiation rod is removed, and the deformation is minimized when the ring beam is finally removed, and the support removal follows the principle of symmetrical bracing. In addition, by comparing and analyzing the three common construction techniques, the concrete silent cutting and bracing scheme is determined. The results of field monitoring show that the order and process of final selection and removal of bracing can meet the engineering requirements and can be used as reference for similar projects in the future.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753
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