In the dewatering test of Xinglongzhuang Coal Mine,there were abnormal phenomena,such as groundwater level and yield changed abnormally in the third layers,filters were broken.

• 兴隆庄煤矿三含放水试验中出现了水位、流量异常变化及滤管被错断的现象，本文对这些现象的形成机理进行了分析。