深基坑组合支护结构内力和变形分析

发布时间：2018-09-12 21:16

【摘要】：以太原铁路职工文化活动中心综合改造项目为工程背景,针对深基坑开挖面积大、紧邻建筑物、地表环境要求严格及支护结构复杂等不利因素,深入分析了深基坑组合支护结构内力和变形规律。利用Flac3d三维有限差分软件,采用摩尔库伦本构模型,模拟了冠梁、钢筋混凝土灌注桩以及钢管支撑的组合支护形式。钢筋混凝土灌注桩是用实体单元来模拟,考虑到桩土之间摩擦问题设置了接触面。冠梁和钢管支撑是用Beam单元来模拟。论文阐述了用Flac3d三维有限差分软件创建复杂支护结构的方法,详细地介绍了用实体单元创建任意位置灌注桩的方法以及不同结构单元之间建立连接的方法。建立摩尔库伦弹塑性三维基坑计算模型,分析了组合支护结构内力和变形规律问题并分析了基坑开挖对地表沉降的影响规律。得出了针对本基坑的设计基本原则和基坑变形机理,为同类深基坑工程的施工提供参考。
[Abstract]:Taking the comprehensive reconstruction project of Taiyuan Railway Workers' Cultural activity Center as the engineering background, aiming at the unfavorable factors such as large excavation area, close to buildings, strict surface environmental requirements and complex supporting structure, etc. The law of internal force and deformation of deep foundation pit composite support structure is deeply analyzed. The combined support forms of crown beam, reinforced concrete cast-in-place pile and steel pipe bracing are simulated by using Flac3d three-dimensional finite difference software and the Moore Coulomb constitutive model. The reinforced concrete cast-in-place pile is simulated by solid element, and the contact surface is set up considering the friction between pile and soil. The crown beam and steel tube bracing are simulated by Beam element. In this paper, the method of creating complex supporting structure with Flac3d 3D finite difference software is described, and the method of creating cast-in-place pile in any position with solid element and the method of establishing connection between different structural elements are introduced in detail. The calculation model of Mohr Coulomb elastoplastic three-dimensional foundation pit is established. The internal force and deformation of composite support structure are analyzed and the influence of excavation on surface settlement is analyzed. The basic design principles and deformation mechanism of the foundation pit are obtained, which provide reference for the construction of similar deep foundation pit projects.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU473.2

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