【摘要】 针对单洞4车道公路隧道(最大开挖宽度22.9 m,最大开挖面积230 m2)Ⅱ,Ⅲ类围岩地表平坦段双侧壁导坑施工方案,应用平面弹塑性有限元方法,对其施工全过程中支护结构受力性状和围岩的稳定性进行了优化数值分析。结果表明,软弱围岩条件下4车道隧道采用双侧壁导坑法能有效控制围岩位移,两侧导坑交替开挖工序优于一侧导坑先行开挖工序。更多还原

【Abstract】 Against a highway tunnel with four lanes constructed by both side drift method in class Ⅱ and Ⅲ surrounding rock,based on FEM,the lining structure and the stability of the surrounding rock are stimulated and analyzed.Research results show that,displacement of surrounding rock in ultra-large span highway tunnel constructed by both side drift method can be controlled effectively and reasonable construction process is obtained.更多还原