小净距软弱围岩公路隧道监控量测与稳定性研究
发布时间：2018-08-11 20:13
【摘要】：我国中西部为多山地区，地质条件复杂多变，软弱围岩经常出现。在此地区修建的高速公路隧道会受到地质和地形条件限制。小净距隧道这种特殊结构形式因其对地形的适应性好、施工方法较连拱隧道简单等优点，在工程中的运用越来越多。如何保证在软弱围岩条件下小净距隧道在修建过程中的整体稳定性，防止出现大变形大塌方事故，是亟待解决的问题。 论文依托谷城至竹溪高速公路分水岭隧道，通过隧道围岩稳定性理论分析、施工过程的现场监控量测、数值模拟研究等方法，对软弱围岩条件下小净距隧道的监控量测技术和稳定性进行了研究。论文主要内容和取得成果如下： （1）通过查阅分水岭隧道勘察资料、施工图以及现场实地察看，获得该隧道详实的工程资料。 （2）介绍了分水岭隧道的监控量测方案和对于所采集数据的判定方法，总结了分水岭隧道从开始施工到结束期间所有断面的拱顶沉降及周边位移最终变形数据，找出其大致与围岩的对应关系。 （3）分析影响围岩稳定的内在和外在因素，结合所有断面现场监测数据以及对代表性断面的监测数据分析，，通过对各类围岩变形特性分析，预测初期支护趋于稳定的时间，为二次衬砌施作时间提供合理依据。 （4）通过有限元分析软件对分水岭隧道Ⅳ、Ⅴ级围岩开挖过程进行了数值模拟，对开挖过程中隧道的变形、初期支护结构的受力进行了分析，得到的位移变形与监控量测数据基本吻合，初期支护和中夹岩柱的注浆加固措施对于隧道围岩的整体稳定是合理有效的。
[Abstract]:The central and western regions of China are mountainous areas with complex geological conditions and weak surrounding rocks. The construction of expressway tunnels in this area will be limited by geological and topographic conditions. How to ensure the overall stability of the tunnel with small clearance under the condition of weak surrounding rock and prevent the occurrence of large deformation and landslide accidents is an urgent problem to be solved.
Based on the Watershed Tunnel of Gucheng-Zhuxi Expressway, the monitoring and measuring technology and stability of small clearance tunnel under the condition of weak surrounding rock are studied by means of theoretical analysis of surrounding rock stability, field monitoring and measurement during construction, and numerical simulation.
(1) By consulting the survey data, construction drawings and on-site inspection of the watershed tunnel, the detailed engineering data of the tunnel are obtained.
(2) This paper introduces the monitoring and measuring scheme of the watershed tunnel and the judging method for the collected data, summarizes the final deformation data of the vault settlement and peripheral displacement of all sections of the watershed tunnel from the beginning of construction to the end, and finds out the corresponding relationship between the vault settlement and surrounding rock.
(3) Analyzing the internal and external factors that affect the stability of surrounding rock, combining with the field monitoring data of all sections and the monitoring data analysis of representative sections, through the analysis of deformation characteristics of various types of surrounding rock, predicting the time when the initial support tends to be stable, providing a reasonable basis for the construction time of secondary lining.
(4) The excavation process of the surrounding rock of the Watershed Tunnel Grade IV and V is simulated by the finite element analysis software. The deformation of the tunnel and the stress of the initial supporting structure are analyzed. The displacement and deformation obtained are basically consistent with the monitoring data. The initial support and the grouting reinforcement measures of the middle rock column are used for the surrounding rock of the tunnel. Overall stability is reasonable and effective.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U456.3
本文编号：2178119
[Abstract]:The central and western regions of China are mountainous areas with complex geological conditions and weak surrounding rocks. The construction of expressway tunnels in this area will be limited by geological and topographic conditions. How to ensure the overall stability of the tunnel with small clearance under the condition of weak surrounding rock and prevent the occurrence of large deformation and landslide accidents is an urgent problem to be solved.
Based on the Watershed Tunnel of Gucheng-Zhuxi Expressway, the monitoring and measuring technology and stability of small clearance tunnel under the condition of weak surrounding rock are studied by means of theoretical analysis of surrounding rock stability, field monitoring and measurement during construction, and numerical simulation.
(1) By consulting the survey data, construction drawings and on-site inspection of the watershed tunnel, the detailed engineering data of the tunnel are obtained.
(2) This paper introduces the monitoring and measuring scheme of the watershed tunnel and the judging method for the collected data, summarizes the final deformation data of the vault settlement and peripheral displacement of all sections of the watershed tunnel from the beginning of construction to the end, and finds out the corresponding relationship between the vault settlement and surrounding rock.
(3) Analyzing the internal and external factors that affect the stability of surrounding rock, combining with the field monitoring data of all sections and the monitoring data analysis of representative sections, through the analysis of deformation characteristics of various types of surrounding rock, predicting the time when the initial support tends to be stable, providing a reasonable basis for the construction time of secondary lining.
(4) The excavation process of the surrounding rock of the Watershed Tunnel Grade IV and V is simulated by the finite element analysis software. The deformation of the tunnel and the stress of the initial supporting structure are analyzed. The displacement and deformation obtained are basically consistent with the monitoring data. The initial support and the grouting reinforcement measures of the middle rock column are used for the surrounding rock of the tunnel. Overall stability is reasonable and effective.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U456.3
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