本文主要分析桩基施工中坍孔的成因和为避免坍孔所采取的措施以及坍孔后的处理方法。

This paper analyzes the causations of collapse of pile foundation construction, states the measures to avoid collapse and the treatment method after collapse.

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施工中采用沉井法、增加护壁厚度、减小长度等一系列措施，克服了流砂、坍孔、涌水等难点，取得了较好的效果。

A series of measures such as open caisson, thickening protective wall and decreasing length, etc. are taken to overcome problems of sand drafting, collapse and water gushing, which get better effect.

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