富水软弱地层微型盾构侧穿对既有桩基变形影响研究

Effect Research on Existing Pile Foundation Deformation as Micro Shield Machine Side-crossing in Weak Watery Stratum

针对富水软弱地层中微型盾构隧道侧穿既有桩基问题,建立MIDAS-GTS有限元模型,模拟侧穿对既有桩基变形影响,并对既有桩基的沉降变形进行现场监测.结果显示,盾构侧穿既有桩基最小距离6.9 m时不会导致较大的桩基沉降变形;既有桩基垂直位移值均处在报警值范围内.该段工程施工控制效果良好,确保了既有构筑物的安全稳定.

Based on the problem of micro shield side-crossing existing piles in weak watery stratum,the MIDAS-GTS finite element model was established to simulate the deformation of existing piles.Moreover,the settlement deformation of the existing piles was monitored in the field.The results showed that,the larger settlement deformation of the piles did not appear as the shield side-crossing at the minimum distance 6.9 m.And the vertical displacement of the piles was also within the alarm range.The effect of construction control management in this section was well,and the safety and stability of existing structures were ensured.