为保护地铁免受基坑开挖影响的隔离桩施工优化

Optimization Study on Isolation Piles for Protecting Subway from Impact of Foundation Pit Excavation

以宁波地铁1号线某深大基坑工程为依托,研究了地铁隧道与基坑不同距离条件下隔离桩控制隧道变形的效果。结果表明,在相同的隔离桩设置条件下,隔离桩对地铁隧道变形的控制效率会随着隧道与基坑距离的变化而变化,当隧道与基坑距离在22～28 m之间时,设置隔离桩控制地铁隧道的变形最有效果。

Based on a deep and large foundation pit project of Ningbo Subway Line 1,the effect of isolation piles on controlling tunnel deformation under different distances between subway tunnels and foundation pits is studied.The results show that,under the same isolation pile setting conditions,the control efficiency of isolation piles on the deformation of subway tunnel will change with the distance between tunnel and foundation pit;when the distance between tunnel and foundation pit is 22–28 m,setting isolation piles is the most effective way to control the deformation of subway tunnel.