大跨度隧道内轮廓扁平率优化设计

文章以兰陵县兰陵路东延工程三峰山隧道为背景,通过建立不同扁平率下的荷载-结构模型计算隧道衬砌内力。得出在同样围岩荷载下随扁平率的增大衬砌内力和洞周位移减小的结论。并对4种不同扁平率的内轮廓进行了结构验算和经济比选,最终确定最优扁平率为0.59。

Based on the background of Sanfeng Mountain Tunnel in the east extension project of Lanling Road in Lanling County,this paper calculates the internal force of tunnel lining by establishing load-structure model at different flattening ratios.It is concluded that the internal force of the lining and the displacement around the tunnel decrease with the increase of the flattening ratios under the same surrounding rock load.The structural checking calculation and economic comparison of four kinds of inner contours at different flattening ratios are carried out,and the optimal flattening ratio is determined to be 0.59.