The main causes of breakage were concrete tube pile instability of foundation pit or failure of its bracing, soil squeeze due to pile driving, incorrect excavation and incorrect heap of soil.

• 摘要造成混凝土管桩倾斜与断裂的主要原因为基坑边坡失稳或支护结构破坏、沉桩挤土效应以及挖土与堆土不当等。