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为评估深厚软土地区临近超浅埋地铁施工对盾构的扰动,结合斜交超浅埋地铁的某客运专线桩板结构路基工程,基于“第三方监测”的工程安全监控模式进行施工及试运营期间的安全评估,并研究了各阶段的变形规律及安全敏感因素。研究结果表明:地铁水平位移只出现于桩基施工阶段;沉降变形与收敛变形则贯穿于整个施工与运营阶段,变形值呈“增大—减小—稳定”的趋势;地铁变形中沉降影响最大,收敛变形次之,水平位移最小,且变形极值均小于安全限值,说明地铁结构是安全的;桩板结构有效控制了后续沉降的发生,大大降低了新建客运专线与既有地铁的相互影响。
In order to assess the disturbance to the shield near the super-shallow subway in the deep soft soil area, combined with the pile-slab structure subgrade project of a passenger special railway with oblique super-shallow subways, construction based on the “third party monitoring” project safety monitoring mode And during the trial operation safety assessment, and studied the deformation of the various stages and safety-sensitive factors. The results show that the horizontal displacement of the subway only appears in the pile foundation construction stage. The settlement deformation and the convergence deformation run through the whole construction and operation stage. The deformation values show the trend of “increasing-decreasing-stabilizing” and the subsidence Which has the greatest influence, the second is the convergence deformation, the smallest is the horizontal displacement, and the deformation extreme value is less than the safety limit, which shows that the subway structure is safe. The pile structure effectively controls the subsequent settlement and greatly reduces the new passenger dedicated line and the existing subway The interaction.