论文部分内容阅读
在山岭重丘区高等级公路建设中,受地形、地质条件和线路平、纵、横指标及三项指标组合设计的制约、工业城区条件的影响,经常采用连拱隧道。连拱隧道具有线形流畅,空间利用率高,占地面积较少,与洞外线路连接方便以及有利于保护环境等优点,因此在我国高速公路建设中应用越来越广泛。通过数值模拟对浅埋大跨径连拱隧道不同施工方案围岩应力场、位移场和塑性区变化规律进行了数值分析,从而有效揭示出不同施工方案各阶段围岩应力集中位置和潜在塑性破坏区,不仅为隧道的安全顺利施工提供了预警信息和直接指导,同时为连拱隧道的优化设计提供可靠的理论依据,为浅埋大跨径连拱隧道施工过程合理设计、监控预警、分析评价与应急处治提供依据。
In the construction of high-grade highways in the mountainous heavy hilly areas, the multi-arch tunnels are often used due to the constraints of topography, geological conditions and the horizontal, vertical and horizontal indexes of the lines and the combination design of the three indicators and the industrial urban conditions. Multi-arch tunnel with a smooth shape, high space utilization, covers an area of less, easy connection with the line outside the tunnel and is conducive to the protection of the environment, etc., so in our country highway construction more and more widely used. The numerical analysis of the variation of surrounding rock stress field, displacement field and plastic zone in different construction schemes of shallow-buried long-span multi-arch tunnel is carried out by numerical simulation, so as to effectively reveal the stress concentration location and potential plastic failure of surrounding rock in different stages of construction schemes Area not only provide early warning information and direct guidance for the safe and smooth tunnel construction, but also provide a reliable theoretical basis for the optimization design of double-arch tunnels for the rational design, monitoring and early warning, analysis and evaluation of the construction process of shallow-buried long-span arch tunnels Provide basis for emergency treatment.