【作者】 刘劲勇；

【导师】 李之达；

【作者基本信息】 武汉理工大学 ， 工程力学， 2005， 硕士

【摘要】 本文以沪蓉国道主干线湖北省宜昌(长江大桥)至长阳(白氏坪)高速公路殷家岩双连拱隧道工程为背景，采用弹塑性有限元数值分析和粘弹性理论计算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围岩与支护结构稳定性进行了数值模拟分析。 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，本文针对中导洞施工左右主洞不同步开挖和理想的同步开挖法进行了较为深入的研究工作。首先，运用有限元程序同济曙光软件(GeoFBA-V3.0)对中导洞施工左右主洞不同步开挖法和理想的同步开挖法进行了动态数值模拟，计算了在不同施工工序下围岩体的应力场、洞周位移以及钢拱架的轴力，尤其对双连拱隧道的核心构件—中隔墙进行了数值模拟分析，得出了其在不同施工工序下的应力图、洞周位移图和钢拱架轴力图。对两种施工方法进行了比较，从结构受力的角度认为采用的理想的同步开挖法方案较优。但由于左右主洞理想的同步开挖的数值模拟结果和不同步开挖法的数值模拟结果较为接近。因此，从施工力学角度考虑可以采用不同步开挖法施工。同时，采用隧道围岩和支护相互作用的粘弹性理论解，探讨了锚喷支护隧道围岩与支护的应力和位移随时间变化规律。通过围岩反算出喷层的厚度，并与设计进行比较，获得较满意的结果。最后，论文对现场监控量测获得的地表下沉曲线、中隔墙压应力变化曲线、洞周位移变化曲线以及锚杆轴力变化曲线进行了分析，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：地表下沉值很小，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。 总之，只要我们不断完善当前数值分析中的不足，加强施工中的信息反馈，并对反馈的信息进行位移反分析，坚持理论—实践—再理论—再实践的原则，进一步提高对岩石力学的认识，对隧道围岩和支护结构的稳定性的判断上采用数值模拟分析，其精度还是可靠的，前景依然是广阔的。对今后类似隧道工程的设计和施工具有一定的指导意义。 该项目为湖北省交通科技项目(03-66-3／4)。更多还原

【Abstract】 Based on the Yinjiayan bi-arch tunnel engineering of the Hurong national highway trunk-line in Hubei Province Yichang (the Changjiang Rive bridge) to Changyan (Baishiping) highway, the thesis primarily discourses upon the numerical simulation analysis of the stability of the excavating and supporting during the bi-arch tunnel construction in the surrounding rock by the finite element method(FEM) calculation , adopting the elasto-plastic and visco-elasticity theory and the method of the time-state of the tunnel information.Combining the study characteristic and the current construction method of the bi-arch tunnel in domastic and aboard, the paper deeply study the middle heading construction method and the benching tunneling construction method. Firstly by the dynamical FEM (GeoFBA-V3.0) 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, based on visco-elastic theory on interaction of surrounding rock of the tunnel with support, the transformation law of the stress and displacement with time of the bolt-shotcrete support is discussed. Calculated the thickness of the shotcrete with the surrounding rock and compared with the design, achieve a satisfying result. Finally, 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 result, 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.In a word, precision of the numerical simulation analysis of the stability of the excavating and supporting during the bi-arch tunnel construction is credible and its prospect is refulgent, if the defect of the numerical simulationanalysis is perfected stage by stage, strengthening on collecting and analyzing the information about displacement, persisting in the principia of theory and practice, and improving the cognition of rock dynamo. These results can have the guiding significance to the design and construction of the similar tunnel engineering.This project is a scientific and technological project of traffic of Hubei (03-66-3/4).更多还原