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以内蒙古新街台格庙矿区的TBM斜井工程为背景,运用FLAC3D软件建立TBM斜井施工的三维模型,基于流固耦合理论,从孔隙水压力、应力及变形3个方面对TBM隧道和TBM斜井进行对比分析,并研究了坡度对TBM斜井围岩力学特性的影响。研究结果表明:流固耦合条件下,随着施工进度的发展,TBM斜井在拱腰和拱底处的应力和变形值要大于TBM隧道的值。坡度对富水条件下的TBM隧道围岩变形和应力的影响较明显,坡度越大,围岩越易失稳,拱腰处的应力、变形及孔隙水压力变化较大,大坡度TBM斜井施工应重点注意拱腰部位的支护及防排水。研究结果可为富水大坡度的TBM斜井工程设计施工提供理论参考。
Based on the TBM incline project in Taghmiao mining area in Xinjie of Inner Mongolia, three-dimensional model of TBM inclined shaft construction is established by using FLAC3D software. Based on the fluid-solid coupling theory, TBM tunnel and TBM are analyzed from three aspects of pore water pressure, stress and deformation Inclined wells were compared and analyzed, and the effect of slope on the mechanical properties of surrounding rock of incline shaft was studied. The results show that with the progress of construction, the stress and deformation of the TBM inclined shaft at the arch waist and the arch bottom are greater than those of the TBM tunnel under fluid-solid coupling conditions. The influence of slope on the deformation and stress of surrounding rock of TBM tunnel under water-rich condition is obvious. The bigger the slope, the more unstable the surrounding rock, the larger the change of stress, deformation and pore water pressure at the arch waist. Construction should pay attention to arch waist support and drainage. The results can provide a theoretical reference for engineering design and construction of TBM inclined shaft with rich water and great slope.