桩锚支护和地连墙对双侧深基坑地铁隧道的变形影响研究

发布时间：2018-08-08 20:39

【摘要】：地铁轨道沿线人口密集、高层建筑与大型地下商场快速建设,深基坑工程也随之增加。深基坑开挖伴随着土压力卸载,周围土体应力重分布,对临近地铁隧道等建筑不可避免地产生影响。基坑支护结构是保持基坑稳定的重要支撑,当深基坑变形量小、稳定性良好时,邻近深基坑的地铁隧道变形通常在可控范围内微小变化,因此,研究支护结构对邻近地铁隧道变形的影响,能够为邻近地铁隧道的深基坑支护设计提供有力依据,以保证深基坑工程建设顺利进行、地铁隧道安全不受影响。本文以郑州综合交通枢纽地下交通工程为研究背景,结合土力学理论分析、有限元软件ABAQUS建模分析与施工现场监测数据,研究了双侧深基坑开挖过程中,桩锚支护和地连墙对邻近地铁隧道的变形影响。主要内容包括:(1)桩锚支护与地连墙的适用性、结构特点、施工工艺及破坏形式。(2)总结了深基坑开挖过程中桩锚支护与地连墙的受力与变形机理,分析了深基坑开挖过程中桩锚支护与地连墙的力学计算理论,在此基础上,总结了桩锚支护与地连墙对邻近地铁隧道变形影响的分析理论。(3)以邻近地铁隧道的双侧深基坑(郑州综合交通枢纽地下交通工程)为工程背景,对其工程概况、地质条件、水文条件进行了详细梳理,在此基础上得出了基坑土体的物理力学性质,并对东广场工程的施工方案进行了总结。(4)利用有限元软件ABAQUS计算了郑州综合交通枢纽地下交通工程(东广场)深基坑开挖过程中地铁隧道的变形,并与施工现场监测数据进行对比,分析了双侧深基坑开挖过程中相邻地铁隧道的变形规律。(5)利用有限元软件ABAQUS模拟了不进行支护时地铁隧道的变形,单独使用桩锚支护时地铁隧道的变形,以及在桩锚和地连墙共同支护下地铁隧道的变形,将三种支护方案下地铁隧道的变形状况进行对比,研究了桩锚支护和地连墙对双侧深基坑地铁隧道的变形影响。研究结果表明:随着双侧深基坑开挖,相邻地铁隧道发生沉降变形,加设桩锚支护与地连墙之后地铁隧道的沉降变形略有减小,减小幅度不大;地铁隧道水平位移向相邻基坑边缘增大,桩锚支护与地连墙均有减小地铁隧道水平位移的作用,与沉降变形相比,桩锚支护对相邻地铁隧道的水平位移减小作用明显,地连墙亦是如此;地铁隧道截面尺寸变化为水平直径增大,竖向直径减小,桩锚支护和地连墙对地铁隧道的应力集中现象具有一定的减小作用。本研究为邻近地铁隧道的深基坑支护结构设计提供了理论依据。
[Abstract]:With the rapid construction of high-rise buildings and large underground shopping malls, the deep foundation pit works are increasing. The excavation of deep foundation pit is accompanied by the unloading of earth pressure, and the stress distribution of surrounding soil is redistributed, which inevitably affects the adjacent subway tunnel and other buildings. The supporting structure of foundation pit is an important support to maintain the stability of foundation pit. When the deformation of deep foundation pit is small and the stability is good, the deformation of subway tunnel adjacent to deep foundation pit usually changes slightly within the controllable range, so, The study of the influence of the supporting structure on the deformation of the adjacent subway tunnel can provide a powerful basis for the design of the deep foundation pit support of the adjacent subway tunnel, so as to ensure the smooth construction of the deep foundation pit project and the safety of the subway tunnel will not be affected. In this paper, based on the underground traffic engineering of Zhengzhou comprehensive transportation hub, combined with soil mechanics theory analysis, finite element software ABAQUS modeling analysis and construction site monitoring data, the excavation process of bilateral deep foundation pit is studied. The influence of pile-anchor support and ground-connecting wall on the deformation of adjacent subway tunnel. The main contents are as follows: (1) applicability, structural characteristics, construction technology and failure form of pile-anchor support and ground connecting wall. (2) stress and deformation mechanism of pile anchor support and ground connecting wall during excavation of deep foundation pit are summarized. This paper analyzes the mechanics calculation theory of pile anchor support and ground connecting wall in the course of deep foundation pit excavation, on the basis of which, This paper summarizes the analysis theory of the influence of pile and anchor support and ground connecting wall on the deformation of adjacent subway tunnel. (3) taking the deep foundation pit of adjacent subway tunnel (underground traffic engineering of Zhengzhou comprehensive traffic hub) as the engineering background, the general situation of the project and the geological conditions are discussed. On the basis of the detailed analysis of hydrological conditions, the physical and mechanical properties of foundation pit soil are obtained. The construction scheme of the East Square Project is summarized. (4) the deformation of the subway tunnel during the excavation of the deep foundation pit of the Zhengzhou Comprehensive Transportation Hub Underground Transportation Project (East Square) is calculated by using the finite element software ABAQUS. Compared with the monitoring data of construction site, the deformation law of adjacent subway tunnel during the excavation of bilateral deep foundation pit is analyzed. (5) the deformation of subway tunnel without supporting is simulated by using finite element software ABAQUS. The deformation of subway tunnel under the support of pile and anchor alone, and the deformation of subway tunnel under the joint support of pile anchor and ground connecting wall are compared. The influence of pile-anchor support and ground-connecting wall on the deformation of subway tunnel with deep foundation pit is studied. The results show that: with the excavation of deep foundation pit on both sides, the settlement deformation of adjacent subway tunnel occurs, and the settlement deformation of subway tunnel decreases slightly with the addition of pile-anchor support and ground connecting wall. The horizontal displacement of subway tunnel increases to the edge of adjacent foundation pit. Both pile and anchor support and ground connecting wall can reduce the horizontal displacement of subway tunnel. Compared with settlement deformation, pile anchor support can reduce the horizontal displacement of adjacent subway tunnel obviously. The horizontal diameter increases and the vertical diameter decreases. The pile-anchor support and the ground connecting wall play a certain role in reducing the stress concentration phenomenon of the subway tunnel. This study provides a theoretical basis for the design of deep foundation pit support structure adjacent to subway tunnel.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U231;U456.3

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