四孔并行矩形顶管施工力学效应研究

发布时间：2018-07-20 16:26

【摘要】：矩形顶管技术作为一种隧道和市政管道暗挖施工技术,由于其断面利用率高、对地面交通影响小等优势,近年来,已被广泛的运用于地铁出入口、地下过街通道、地下商业街等位于城市繁忙区域的地下空间开发工程中。顶管施工过程中会对周边土体产生不同程度的扰动,引起地表隆起、沉降,目前国内关于多孔并行大断面矩形顶管施工力学行为引起的自身相互影响和环境效应的研究还较少。本文以佛山市南海区桂城街道四孔并行顶管工程项目为依托,在对土压平衡式顶管施工基本原理和矩形顶管施工工艺流程进行分析、总结的基础上,通过理论分析、数值模拟、现场监测等手段对由于顶管施工引起的自身相互影响和环境效应问题进行了深入的研究。本论文主要成果如下：1.总结了矩形顶管施工原理及特点,探讨了顶管施工过程中引起的环境力学效应问题。2.运用FLAC3D对不同施工顺序进行了数值模拟分析,综合考虑地表沉降、管涵沉降、管间相互影响及顶管结构内力,确定了顶管施工的最优顶进顺序。3.通过数值模拟对顶管施工时正面推力引起的土体附加应力变化情况及其影响范围进行了分析总结。4.对四孔顶管施工过程中涵管的受力、顶管施工完成后管片的受力及管间开洞后管片受力变化情况进行了分析。5.通过顶管施工全过程的三维数值模拟,研究了不同顶程下纵、横向的地表位移变化规律、涵管和顶管位移变化规律。6.对现场实测位移资料进行了整理分析,并将实测地表沉降规律与模拟计算的地表沉降规律进行了对比分析,其规律和数值基本一致。
[Abstract]:Rectangular pipe jacking technology as a tunneling and municipal pipeline tunneling construction technology, due to its high cross-section utilization rate, small impact on surface traffic and other advantages, in recent years, has been widely used in subway entrances and subterranean passageways, The underground commercial street is located in the underground space development project in the busy area of the city. In the process of pipe-jacking construction, the surrounding soil will be disturbed to varying degrees, resulting in surface uplift and settlement. At present, there is little research on the self-interaction and environmental effect caused by mechanical behavior of porous parallel large-section rectangular pipe jacking in China. Based on the parallel pipe jacking project of Guicheng Street in Nanhai District of Foshan City, this paper analyzes the basic principle of soil pressure balanced pipe jacking construction and the process flow of rectangular pipe jacking construction, and summarizes it by theoretical analysis and numerical simulation. The problems of self-influence and environmental effect caused by pipe-jacking construction are deeply studied by means of field monitoring and so on. The main achievements of this paper are as follows: 1: 1. This paper summarizes the principle and characteristics of rectangular pipe jacking, and discusses the environmental mechanical effect caused by pipe jacking. The numerical simulation analysis of different construction sequence is carried out by using FLAC3D. Considering the surface settlement, pipe culvert settlement, the interaction between pipes and the internal force of pipe jacking structure, the optimal jacking sequence of pipe jacking construction is determined. Through numerical simulation, the change of soil additional stress caused by frontal thrust during pipe jacking construction and its influence range are analyzed and summarized. The stress of culvert during the construction of four-hole pipe jacking, the stress of pipe segments after pipe jacking construction and the stress change of pipe segments after opening between pipes are analyzed. Through the 3D numerical simulation of the whole process of pipe jacking construction, the variation law of surface displacement, culvert pipe and pipe jacking displacement under different top paths are studied. The field measured displacement data are analyzed, and the law of ground subsidence measured is compared with that calculated by simulation. The law is basically consistent with the numerical value.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU990.3

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