逆作法施工变形对主体结构影响的全过程数值分析

发布时间：2018-04-18 22:19

本文选题：基坑支护 + 逆作法施工　；参考：《山东建筑大学》2017年硕士论文

【摘要】：逆作法是随着我国城市建设向高空和地下发展,交通设施向多层次立体发展而产生的一种新型的基坑支护技术,对比传统的常规基坑支护形式,逆作法在环保、节能、地下空间利用效率等方面具有明显的优势,它克服了传统工程技术的诸多不足,具有可持续性,不仅在施工高层建筑的地下空间时成效显著,并且也符合建设节约型社会的大方向。然而,由于逆作法深基坑支护在实际的基坑工程中只是处于初步的应用阶段,在设计理论和施工技术等方面,仍需要进行大量的研究来做铺垫,进而为深基坑逆作法技术发展提供更为完善的设计思路和分析方法。本文内容包括以下几个方面:(1)本文基于荣成市旭日公馆高层住宅基坑项目,通过理论推导、采用规范公式和建立弹性支撑模型的方法,研究了施工变形对逆作法结构竖向承载力的影响,分析了立柱桩产生不均匀沉降时上部结构内力的变化,最大沉降点位置、梁上最大弯矩和剪力变化情况。(2)利用PLAXIS 3D数值模拟了逆作法施工各阶段,通过各施工工序下模型单元的位移及内力变化情况,分析了基坑变形、立柱与内支撑竖向位移及立柱桩的内力,得到了施工完成后基坑变形趋势和在不同施工阶段下基坑内部角柱、边柱、中柱内力随深度变化曲线,并根据变化曲线对角柱、边柱、中柱进行了对比分析,总结了它们的变化规律。(3)利用PLAXIS 3D模拟了逆作法施工过程中由于施工不当造成的立柱倾斜、桩下沉的不利情况。分析了施工完成后立柱倾斜和立柱桩下沉对立柱桩内力和梁内力及变形的影响,并分别将倾斜和下沉后的角柱和边柱与正常施工状态下的内力进行了对比,探讨施工变形对逆作法结构的影响,为下一步的安全施工提供依据。
[Abstract]:The inverse method is a new type of foundation pit support technology, which is produced by the development of urban construction to the high altitude and underground, and the transportation facilities to the multi-level and three-dimensional development. Compared with the conventional foundation pit support form, the inverse method is environmental protection and energy saving.The utilization efficiency of underground space has obvious advantages. It overcomes many shortcomings of traditional engineering technology and is sustainable. It is not only effective in the construction of underground space of high-rise buildings.And also in line with the general direction of building a conservation-oriented society.However, the reverse method of deep foundation pit support in the actual foundation pit engineering is only in the initial application stage, in the design theory and construction technology, still need a lot of research to do the bedding,Thus, it provides a more perfect design idea and analysis method for the development of deep foundation pit reverse method technology.The content of this paper includes the following aspects: (1) based on the foundation pit project of the high-rise residence in Rongcheng City, this paper adopts the normative formula and the method of establishing the elastic support model through theoretical derivation.The influence of construction deformation on vertical bearing capacity of inverse structure is studied. The variation of internal force of superstructure and the position of maximum settlement point are analyzed.The variation of maximum bending moment and shear force on the beam is simulated by PLAXIS 3D. The deformation of foundation pit is analyzed by changing the displacement and internal force of the model element in each construction procedure.The vertical displacement and the internal force of the column and the pile are obtained. The deformation trend of the foundation pit and the variation curves of the internal forces of the corner column, the side column and the middle column with the depth under different construction stages are obtained, and according to the change curve, the angle column and the edge column are analyzed.The comparison and analysis of the middle columns are made, and their changing rules are summarized. The PLAXIS 3D is used to simulate the adverse situation of the tilting of the columns and the sinking of the piles caused by the improper construction during the construction of the reverse construction.This paper analyzes the influence of the tilting and sinking of the column on the internal force of the pile and the internal force and deformation of the beam after the completion of the construction, and compares the angle column and the side column after the tilting and sinking with the internal forces under the normal construction condition, respectively.This paper discusses the influence of construction deformation on the structure of reverse construction, and provides the basis for the next safe construction.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753;TU94

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