浅埋隧道施工过程仿真分析

【作者】 张小旺；

【导师】 王复明；

【作者基本信息】 郑州大学 ， 水工结构工程， 2007， 硕士

【摘要】 近年来，随着我国公路，特别是高速公路的迅速发展，公路隧道建设已经进入大发展的新时期，丘陵地区日益增多的浅埋隧道建设已经对施工技术提出了更高的要求。本文在现有隧道工程施工过程数值模拟的基本理论和分析方法的基础上，应用平面应变弹塑性以及三维弹塑性模型和有限单元法研究了浅埋隧道施工过程中围岩及支护结构力学行为变化过程，并将其应用于实际工程，取得良好效果。首先本文结合河南岭南高速公路分水岭隧道实际工程，应用平面应变弹塑性模型对实际工程中较常见的三种施工工序进行了施工模拟，并分析了它们各自的围岩和支护结构的受力变形规律，经过比较，得出台阶法较为适合修建该浅埋公路隧道的结论，并被设计施工单位接受；通过与隧道围岩位移实测值的比较，认为数值模拟分析中得到的施工过程中隧道围岩应力场、位移场和塑性区域变化规律，以及支护结构的内力变化规律基本与实际情况相符合，从而可以更好地监控和指导现场施工。最后利用APDL参数化设计语言，在ANSYS程序内部二次开发了针对浅埋公路隧道的三维有限元数值仿真分析程序，并结合分水岭隧道工程进行施工过程数值仿真分析，得出隧道围岩应力与位移时空变化规律，以及支护结构内力空间分布规律，并模拟了偏压车辆荷载对隧道围岩应力场的影响，通过与现场量测结果比较，验证了数值仿真结果的合理性。更多还原

【Abstract】 In recent years, with the rapid development of the expressway, especially superhighway of our country, highway tunnel in our country have entered the new period of great development, which promotes higher challenge and requestion to build technology of highway tunnel, especially the shallow-depth tunnel in foothill.Based on theoretical method of tunneling construction numerical simulation, the mechanical variety of the surrounding rocks and supporting strcutures in shallow-depth tunnel construction has been studied by plane strain and 3-dimensional elastoplasticity models and the Finite Element Method (FEM). The study was applied to actual projects and got good results.The construction simulation of the three familiar construction processes in actual projects has been performed by plane strain elasticoplastic model with the project of dividing ridge tunnels of Henan Lingnan freeway, and the deformation regulation of its surrounding rocks and supporting has been analyzed. By comparing, the ladder method is suit for constructing the shallow-depth highway runnel, and is accepted by the unit in charge of construction. By comparing with the measured values of the surrounding rocks displacement of the tunnel, the variety regulation of the stress field, displacement field, plastic region of the tunnel’s surrounding rocks and the internal force of the supporting in numerical simulation analysis is consistent with the fact. Thus, the numerical analysis can be used in construction guide.Finally, the 3-dimensional FEM numerical emulation analysis program for the shallow-depth highway tunnel has been developed by APDL parametrization design language in ANSYS and can be improved in the future. Construction on dividing ridge tunnel has been simulated to obtain the variety regulation of the stress and displacement of the tunnel’s surrounding rocks and the internal force of the supporting, and the effect of biasing carload on stress field of tunnel’s surrounding rocks has been simulated too. By comparing with the measured values, the result of numerical emulation is applicable.更多还原