城区复杂环境下节理岩体隧道施工力学研究

发布时间：2018-06-20 14:31

本文选题：隧道 + 城区复杂环境　；参考：《重庆大学》2014年硕士论文

【摘要】：重庆东水门大桥·千厮门大桥渝中区连接隧道设计全长715m，根据现场地势变化分别采用明、暗挖法修建。隧道围岩中节理较为发育，，周边建筑物较多且与轨道六号线近接，工程环境复杂。本文以渝中连接隧道为依托，对隧道小净距段、暗挖与轨道六号线交叠段以及明挖与轨道六号线交叠段的施工力学效应进行深入的研究，并结合监控量测资料，有效地指导施工，也可为城区复杂工程环境下节理岩体隧道设计、施工、科研等方面提供借鉴的经验。主要工作及研究成果如下： ①在工程地质、施工地质分析和岩石力学实验的基础上，选取符合工程实际的围岩参数，建立节理岩体工程力学模型。 ②针对小净距隧道段分别建立三维有限元模型以及二维离散元模型，对其施工力学效应进行分析，详细分析了围岩的位移及应力变化特征、隧道的开挖对建筑物的影响等。在考虑节理的情况下对其施工支护方法进行了优化。 ②针对暗挖与轨道六号线交叠段分别建立三维有限元模型以及二维离散元模型，分析了暗挖段连拱隧道围岩的位移及应力变化特征、隧道开挖对轨道六号线以及地表建筑物的影响等。通过与监控量测资料的对比分析，验证了数值分析结果的正确性。 ③针对明挖与轨道六号线交叠段分别建立三维有限元模型以及二维离散元模型，分析了明挖段开挖对六号线以及地表建筑的影响。在考虑节理情况下模拟了托换桩的施工，得出了托换桩施工对围岩和六号线的影响程度。
[Abstract]:The design of connecting tunnel of Qianshuimen Bridge Yuzhong District of Dongshuimen Bridge in Chongqing is 715m in length. In the surrounding rock of the tunnel, the joints are more developed, the surrounding buildings are more and close to track Line 6, and the engineering environment is complex. Based on the Yuzhong Link Tunnel, this paper makes a deep study on the construction mechanics effects of the small distance section of the tunnel, the overlapping section of the hidden excavation and track line 6 and the overlap section of the open excavation and track line 6, and combines with the monitoring and measuring data. It can also be used for reference in the design, construction and scientific research of jointed rock mass tunnels under complex engineering environment in urban areas. The main work and research results are as follows: 1 on the basis of engineering geology, construction geological analysis and rock mechanics experiments, the parameters of surrounding rock which accord with the engineering practice are selected. The engineering mechanics model of jointed rock mass is established. (2) the three-dimensional finite element model and the two-dimensional discrete element model are established for the small net distance tunnel section respectively, and the construction mechanics effect is analyzed. The variation characteristics of displacement and stress of surrounding rock and the influence of tunnel excavation on buildings are analyzed in detail. Under the condition of considering joints, the construction support method is optimized. (2) the 3D finite element model and the two-dimensional discrete element model are established for the intersection section of the hidden excavation and track line 6, respectively. The variation characteristics of displacement and stress in the surrounding rock of the double-arch tunnel in underground excavation section and the influence of tunnel excavation on track No. 6 and surface buildings are analyzed. The correctness of the numerical analysis results is verified by comparing the data with the monitoring data. (3) the 3D finite element model and the two-dimensional discrete element model are established for the intersection section of the open excavation and track line 6, respectively. The influence of the excavation of the open excavation section on the sixth line and the surface buildings is analyzed. Under the consideration of joints, the construction of underpinning pile is simulated, and the influence of underpinning pile construction on surrounding rock and No. 6 line is obtained.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U451;U455.49

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