膨胀土地层钻孔灌注桩缩径原因及预防措施

Cause of Hole Shrinkage of Bored-grouting Pile in Expansive Soil and the Prevention Measures

摘要:

在膨胀性粘土地层施工钻孔灌注桩，桩身一般会出现缩径情况。通过在膨胀性粘土中施工钻孔灌注桩的工程实践，分析了桩身缩径的成因，论述了“跳打法”的施工方案及施工效果，解决了由于粘土地层膨胀导致的钻孔灌注桩缩径的问题。

Abstract:

Hole shrinkage often occurs while bored-grouting pile is constructed in expansive clay， the cause is analyzed with engineering practice， “interval construction” is discussed with the effect presenting， which solved the hole shrinkage problem.