裂隙中的粘土充填物在地下水物理、化学的作用下，力学性能不断弱化，使岩体裂隙的临界应力强度因子不断降低，裂隙扩展具有时间效应，导致底板裂隙的滞后突水。
The mechanic capability of the crevice clay filling falls because the physiology and chemistry of the groundwater, which lags the crevice spreading and leads to the lagging floor water bursting.
利用裂隙的亚临界扩展理论对底板滞后突水现象进行了分析。
The phenomenon of the lagging water bursting is explained applying crevice inferior critical spreading .
摘要：在煤矿开采过程中，裂隙是水及瓦斯富集、存储、运移的场所，是诱发煤层底板突水和瓦斯突出的重要因素。
Abstract: in the process of coal mining, fissure water and gas enrichment, storage, transport, water-inrush from coal floor and gas outburst is induced.
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