浅埋大跨隧道穿越建筑物风险分析及控制研究

发布时间：2018-01-15 21:08

本文关键词：浅埋大跨隧道穿越建筑物风险分析及控制研究　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：城市轨道交通的快速发展，形成很多隧道穿越建筑物的工程实例，而浅埋大跨隧道穿越建筑物给施工带来了更大难度。隧道开挖造成的隧道周围应力应变十分复杂，地表建筑物的存在更是增加了施工的难度。因此，在此类隧道开挖过程中，不仅要考虑隧道自身的稳定性，也要考虑到地表建筑物的安全。目前，对于这类工程的理论研究国内外还不完善，，对其相互作用机理还不明确，还处于摸索前进的阶段，需要全面、系统的研究，以保证施工安全。本文以重庆轨道交通一号线沙坪坝车站隧道为依托，采用MIDAS/GTS有限元分析软件对该车站隧道开挖过程进行数值模拟计算，分析各种开挖方法的施工风险，并提出相关控制措施，分析过程如下： ①通过采用数值模拟的方法，从台阶法开挖、CD法开挖、双侧壁导坑法开挖的不同工况进行数值模拟分析，通过综合分析不同工况下隧道及围岩变形、地表沉降、围岩应力变化，找出不同工法的施工风险所在。最终得出双侧壁导坑法开挖造成的隧道及围岩变形最小、拱顶及拱腰应力最小、开挖过程中围岩最稳定。 ②从改善围岩的物理力学性质，即改善围岩的强度、刚度、渗透性的角度出发，提出各种风险控制措施，达到降低围岩应力、减少隧道及围岩变形、降低地表沉降、减少建筑物破坏的目的，保证施工安全顺利。 ③结合该工程施工过程中监控量测数据，分析浅埋大跨隧道穿越建筑物风险控制措施的有效性。
[Abstract]:The rapid development of city rail traffic, forming many tunnels through building engineering examples, and the large span shallow tunnel crossing building construction has brought greater difficulty. The surrounding stress and strain is very complicated due to tunnel excavation of tunnel surface buildings are increasing the difficulty of construction. Therefore, in the process of the tunnel excavation that should not only consider the stability of the tunnel itself, also want to consider the safety of surface buildings. At present, for this kind of engineering theory research at home and abroad is not perfect, the interaction mechanism is not clear, is still in the groping stage, the need for a comprehensive, systematic research, to ensure the safety of construction.
Based on the Shapingba station tunnel of Chongqing Rail Transit Line 1, the MIDAS/GTS finite element analysis software is applied to carry out numerical simulation and calculation for the excavation process of the station tunnel, and the construction risk of various excavation methods is analyzed, and the relevant control measures are put forward. The analysis process is as follows:
By using numerical simulation method, the excavation step method, CD method of excavation, numerical simulation analysis of different conditions of excavation method of double side, and through the comprehensive analysis of tunnel surrounding rock under different conditions of deformation, surface subsidence and rock stress changes, and find out the construction risk of different construction methods lies. Finally the double side heading method of tunnel the surrounding rock deformation caused by excavation and minimum, vault and arch waist minimum stress, surrounding rock during excavation is the most stable.
From the physical and mechanical properties improvement of surrounding rock, that is to improve the rock strength and stiffness, the permeability of the point of view, put forward various risk control measures to reduce the stress of surrounding rock and tunnel, reduce the deformation of the surrounding rock, reduce surface subsidence, reduce the damage of the building to ensure the safety of construction smoothly.
Combined with the monitoring data during the construction of the project, the effectiveness of the risk control measures for shallow and large span tunnel crossing the buildings is analyzed.

【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.4

【参考文献】