京承高速公路新道沟连拱隧道的优化设计
OPTIMIZED DESIGN OF XINDAOGOU DOUBLE VAULT TUNNEL ALONG BEIJING-CHENGDE FREEWAY
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摘要: 本文以京承高速公路新道沟连拱隧道为实例,应用有限元数值方法对连拱隧道二次衬砌的围岩抗力、应力、变形及其稳定性等问题进行了模拟与分析。首先,基于连拱衬砌的结构型式,作者建立了该隧道的数值模型,并提出用弹性杆单元按作用力等效的原则模拟围岩抗力;根据数值模拟结果对隧道支护结构的承载能力进行了讨论,并基于规范对二次衬砌进行了结构强度校核。该研究结果为新道沟隧道支护结构设计的优化提供了科学依据。Abstract: This paper presents results of the wall rock resistance,the lining-stress,distortion and stability of XinDaoGou double vault tunnel along Beijing-Chengde highway using the finite element method.The model was developed based on structure of double vault lining with the wall rock resistance which is simulated by elasticity pole cell.In addition,the secondary lining strength in maximal measured-stress face is checked against design specification of high way tunnel.Such results provide guidelines for the optimizing design of XinDaoGou tunnel.
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