在非黏性土中，当渗流达到一定程度，较小的土粒逐渐随水带出，土粒之间的空隙扩大以致形成空洞，发生集中涌水的现象【水】piping

• 南锚碇将成为长江上最大的管涌隐患。

  The southern anchor blocks will become the greatest potential piping danger in the Yangtze River.

• 2003年黄河秋汛，东平黄河肖庄控导工程发生根石严重走失和管涌险情。

  In the 2003 Yellow River autumn flood season, severe base stone loss and piping dangers occurred at the control and guiding project at Xiaozhuang, on the Yellow River in Dongping.