【摘要】 为研究不同施工方法下深埋排水隧道围岩变形机制及稳定性控制,利用有限差分程序FLAC3D模拟了在不同施工方法下隧道的开挖支护过程,研究了隧道支护结构的变形与应力变化规律,探索了围岩稳定性,并分析了应力场、塑性区及变形对不同围岩力学参数敏感性。研究结果表明,在不同施工方法下排水隧道衬砌按抗压及抗拉验算均是安全的,且最大拉应力主要集中在拱底上;采用全断面法施工时围岩的竖向位移和水平位移最小;衬砌应力及围岩变形对弹性模量最敏感,黏聚力和内摩擦角对塑性区影响较大。更多还原

【Abstract】 In this paper,the deformation and stress variation of tunnel lining are studied by using finite difference program FLAC3 D,and the mechanical response characteristics of surrounding rock are explored. Besides,the sensitivity of stress field,plastic zone and deformation to different mechanical parameters of surrounding rock is analyzed. The results indicate that under different construction methods,the lining of drainage tunnel is safe according to the pressure and tensile calculation,and the maximum tensile stress is mainly concentrated on the bottom arch. The maximum vertical and horizontal displacements of surrounding rock are the smallest when constructed by full section method.Lining stress and surrounding rock deformation are most sensitive to elastic modulus,and the adhesion force and friction angle have great influence on plastic zone.更多还原