超大断面浅埋岩层隧道施工方案优化及稳定性评价研究

发布时间：2018-10-10 13:18

【摘要】：铁路是我国重要的基础运输设施,在交通体系中占有非常重要的地位。近年来由于我国经济体制的快速发展,高速铁路进入了一个快速建设时期,大断面、超大断面隧道在山岭高铁区间的使用尤为突出。超大断面隧道因其开挖跨度大,施工工序复杂,对围岩造成多次扰动,岩石和土体受力复杂,合理的开挖方法及衬砌变形受力的实时监控是确保隧道安全施工的关键。本文以西安-成都铁路客运专线得利隧道建设为背景,通过理论分析、数值模拟、现场监测相结合的方法,确定了得利隧道的施工方案并对其稳定性做出了评价。论文在查阅相关文献资料的基础上,分析了国内外关于大断面及超大断面隧道的研究进展,掌握了不同工况下大断面隧道围岩受力、变形、沉降之间的相互关系。针对得利隧道工程实际,初步选定两种施工方案,建立二维数值模型,对两种不同施工方案进行了数值分析计算。在二维数值计算结果的基础上,针对不同施工方法、不同步距开展了三维数值模拟分析。通过对比各工况下隧道围岩及支护结构的受力、变形、沉降,综合现场施工的经济性、时效性,对超大断面浅埋隧道进行了施工方案的优化。对得利隧道施工进行了现场监测,监测内容包括:钢拱架应力监测、锚杆轴力监测、隧道围岩压力监测、围岩深部位移监测、衬砌间压力监测及隧道沉降的监测等。通过对监测数据及三维数值模拟数据的分析,对隧道的稳定性做出了评价分析。本文为得利隧道安全施工提供了理论依据,本文的研究方法可供超大断面隧道施工方案选择和稳定性评价借鉴。
[Abstract]:Railway is one of the most important basic transportation facilities in China and plays a very important role in the transportation system. Due to the rapid development of China's economic system in recent years, high-speed railway has entered a period of rapid construction. The use of large-section and super-section tunnels in the mountain and high-speed railway section is particularly prominent. Due to its large excavation span, complex construction procedure, multiple disturbances to surrounding rock and complex stress on rock and soil, reasonable excavation method and real-time monitoring of lining deformation are the key to ensure tunnel safe construction. In this paper, based on the construction of Duli tunnel of Xi'an Chengdu railway passenger dedicated line, through theoretical analysis, numerical simulation and field monitoring, the construction scheme of Deli tunnel is determined and its stability is evaluated. On the basis of consulting relevant documents, this paper analyzes the research progress of large-section tunnel and super-section tunnel at home and abroad, and grasps the relationship between the stress, deformation and settlement of surrounding rock of large-section tunnel under different working conditions. In view of the actual situation of Deli tunnel project, two kinds of construction schemes are preliminarily selected, and a two-dimensional numerical model is established, and two different construction schemes are numerically analyzed and calculated. Based on the results of two-dimensional numerical calculation, three-dimensional numerical simulation analysis is carried out for different construction methods. By comparing the stress, deformation, settlement, economy and timeliness of the tunnel surrounding rock and supporting structure under various working conditions, the construction scheme of shallow buried tunnel with super large section is optimized. Field monitoring is carried out on the construction of Deli tunnel, which includes stress monitoring of steel arch frame, axial force monitoring of anchor rod, monitoring of surrounding rock pressure, monitoring of deep displacement of surrounding rock, monitoring of pressure between lining and settlement of tunnel, etc. Through the analysis of monitoring data and three-dimensional numerical simulation data, the stability of tunnel is evaluated and analyzed. This paper provides a theoretical basis for the safe construction of Deli tunnel, and the research method of this paper can be used for reference in the selection of construction scheme and the evaluation of stability of super-large section tunnel.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.4

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