施工技术 2016年6月上 80 CONSTRUCTION TECHNOLOGY 第45卷第11期 D0I:10.7672/8js2016110080 基于扩展有限元法的不同扁平率隧道稳定性研究* 范君黎，朱哲明 (四川大学建筑与环境学院，四川成都610065) [摘要]针对不同扁平率的隧道模型，利用扩展有限元法(XFEM) 对隧道的损伤破坏进行了数值模拟研究，同时进 行了隧道模型试验.隧道模型为含有单一裂纹和不含裂纹的模型，模拟研究了隧道模型的抗压强度和裂纹的起裂 与扩展规律.结果表明，对无裂纹隧道模型，扩展有限元法能够很好地模拟裂纹产生的位置以及扩展的路径，隧道 模型的破坏以拉剪破坏为主，在扁平率为0.9时抗压强度达到最大；对有裂纹模型，扩展有限元法能够很好地模拟 初始裂纹的扩展路径，隧道模型的破坏有明显剪切破坏的痕迹，但剪切破坏没有主导整体破坏方式，在扁平率为 1.7时抗压强度达到最大. [关键词]隧道工程；扩展有限元法；扁平率；抗压强度；裂纹 [中图分类号]U452 [文献标识码]A [文章编号]1002-8498(2016)11-0080-05 Study on the Effect of Different Flat Ratio on Tunnel Stability Based on Extended Finite Element Method Fan Junli Zhu Zheming (School of Architecture and Enrironment Sichuan Unicersity Chengdu Sichuan 610065 China) Abstract:For tunnels with different flat ratio numerical study on tunnel stability based on extended finite element method (XFEM)was implemented meanwhile tunnel mode experiments were conducted.The pressive strength of tunnel models as well as the initiation and propagation of cracks inside tunnel models is investigated.The results showed that extended finite element method has high degree of accuraey to simulate the initiation location and extension path of cracks for non-crack tunnel models the failure mode is mainly shear failure and the pressive strength of tunnel models es to the largest when flat ratio is 0.9;for tunnel models with a crack the crack propagation path simulated by using extended finite element method agrees very well with the experimental results shear failure...
基于扩展有限元法的不同扁平率隧道稳定性研究.pdf
