【作者】 李晓洪；

【导师】 赵玉光；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2003， 硕士

【摘要】 本文依托广惠(广州—惠州)高速公路小金口双连拱隧道工程，采用有限元数值分析以及隧道信息化施工现场监控量测的研究方法和技术手段，对双连拱隧道在施工过程中隧道开挖和支护力学进行了初步探讨。 结合目前国内外对双连拱隧道的研究特点以及国内外对双连拱隧道施工方法的现状，本文针对三导坑法和上下台阶法进行了较为深入的研究工作。首先，运用有限元程序ANSYS对三导坑法和上下台阶法进行了动态数值模拟，分析了在不同施工工序下围岩体的应力场、位移场以及钢拱架的轴力和弯矩，尤其对双连拱隧道的核心构件—中隔墙进行了分析，得出了其在不同施工工序下的应力图。对两种施工方法进行了比较，认为采用上下台阶法开挖的方案较优。同时，论文对现场监控量测获得的钢拱架轴力弯矩时态曲线以及锚杆轴力时态曲线进行了分析，并与理论计算进行了比较，验证。通过有限元计算和对现场监控量测数据的分析，论文得出：中隔墙主要承受结构传递的竖向压力，弯矩值较小；钢拱架的轴力以受压为主，弯矩值在中隔墙上方位置处最大。最后，结合有限元的理论计算及现场实测数据的分析，初步建立了双连拱隧道支护结构体系的内力模型，即：围岩土压力模型、初期支护钢拱架内力(主要为轴力和弯矩)模型以及锚杆轴力模型。充分理解和阐述了构件的工作状态，对今后类似隧道工程的设计和施工具有一定的指导意义。更多还原

【Abstract】 Based on the Xiaojinkou bi-arch tunnel engineering of the Guanghui(Guangzhou-Huizhou) highway, the thesis primarily studies the mechanics problem of the excavating and supporting during the bi-arch tunnel construction in the soft surrounding rock by the finite element method(FEM) calculation and the analysis of the field monitoring measured data.Combining the study characteristic and the current construction method of the bi-arch tunnel in domastic and aboard, the paper deeply study the three heading construction method and the benching tunneling construction method. Firstly, by the dynamical FEM calculation about the above two construction method, the paper analyses the stress field and displacement field of the surrounding rock and the axial force and bending moment of the steel framework, specially analyses the most important member-the central wall and obtains the stress pattern during the different construction working procedure. After comparing the two methods, the paper considers the benching tunneling method is better. At the same time, the thesis analyses the time-state curve of the axial force and bending moment of the steel framework and the axial force of the anchor bolt. The analysis results are compared with the results of the FEM calculation. Through the FEM calculation and the analyzing data of the field, the result is that the central wall mainly endures the vertical pressure from the structure transferring and its bending moment is relatively less and its position of the maximum value of the bending moment locates in the joint between the central wall and the steel framework. Finally, the thesis primarily sets up the internal force model of the supporting structure system in the bi-arch tunnel, namely, the distribution model of the surrounding rock’s pressure, the internal force model of the steel framework and the axial force model of the anchor bolt, and these results can have the guiding significance to the design and construction of the similar tunnel engineering.更多还原