双孔小净距隧道不同开挖方法的有限元模拟

FINITE ELEMENT SIMULATION OF DIFFERENT EXCAVATION METHODS FOR DOUBLE HOLE SMALL CLEAR DISTANCE TUNNEL

由于在结构受力和施工上的优越性,双孔小净距隧道在高速公路中得到了越来越多的应用。鉴于山岭隧道的受力复杂性和当前对于施工安全的要求较高,对于隧道开挖过程中的应力和应变的模拟,成为当前保障隧道安全必不可少的措施。本文通过对于不同开挖方法的模拟分析,得到了相关应力和应变关系,发现台阶-侧壁导坑组合方法在应力和应变控制中具有较大的优势,施工安全系数较高,对于未来山岭隧道双孔小净距隧道的的施工方法的选择和质量控制提供可资借鉴的理论和实际工程经验。

Because of the advantages of structure,force and construction,double hole small distance tunnel has been applied more and more widely in the expressway.In view of the complexity of the force of the mountain tunnel and the high demand for construction safety,the simulation of the stress and strain in the tunnel excavation has become an essential measure to ensure the safety of the tunnel.For mountain tunnel,especially double tunnel excavation of small spacing,through the simulation analysis of different excavation methods,the relationship between stress and strain is obtained,.It is found that the step-side heading method in combination should have advantages in stress and strain control,construction safety coefficient is higher,to provide reference for theoretical and practical engineering experience for future application of double tunnel small spacing tunnel step-side heading method.