管道井基坑支护方案优选

STUDY ON OPTIMIZATION OF SUPPORTING SCHEME FOR UNDERGROUND PIPE WELL PIT

目前针对建筑基坑的支护技术十分成熟,但这些技术在管道井基坑支护中很少应用,管道井基坑因具有窄而深、平面尺寸为圆形、周边环境复杂等特点,常采用沉井支护,但沉井在施工过程中存在造价高、对周边环境影响大(尤其在软土层中)等问题。现结合某管道井实际工程,在分析基坑特点的基础上,将建筑基坑中常用的钻孔灌注桩加环形支撑的支护方案应用到管道井基坑中,计算和实测结果均证实该支护方案非常适合管道井基坑,为今后类似项目提供参考。

The support techniques for building foundation rarely used in the underground pipe well pit. The features of narrow and deep, round, complex surrounding environment often appear in the underground pipe well pit. So the caisson is used for supporting the underground pipe well pit. However, there are lots of problems such as high cost and the im- pact on the surrounding environment （especially in soft soil）during the construction process of caisson. Now, there is a project about underground pipe well pit, the support scheme is proposed after analysis of the characteristics of the pit. That is bored piles with ring-shaped support which is used for foundation pit. And the measured and calculated results show the effectiveness of the support program is ideal for the pit, which provides a reference for future simi- lar projects.