超大断面隧道设计计算方法研究

针对深圳市过境高速公路连接线工程分岔超大断面隧道关键节点,采用数值模拟的手段,分析了隧道的围岩开挖后应力应变关系,提出了荷载计算的新的方法.根据工程的地质,对隧道结构形式的设计方法、要点及设计中应注意的问题进行了探讨.计算表明,采用应变指标判断松散拱荷载的方法是较为可靠的计算大断面荷载的计算方法.隧道采用多导洞开挖施工...

Study on Design and Calculation Method of Super Large Section Tunnel

In view of the key nodes of the super-large section tunnel of the transit expressway link project in Shenzhen, the stress-strain relationship after the excavation of the surrounding rock of the tunnel is analyzed by means of numerical simulation, and a new method of load calculation is proposed. According to the geology of the project, the design method, key points and problems that should be paid attention to in the design of tunnel structure are discussed. The calculation results show that the method of judging the load of loose arch by strain index is a more reliable method for calculating the load of large section. The construction method for excavation of multiple pilot tunnels is safer, and the deformation of surrounding rock is also controllable. This design method can provide reference for the design of such structure.