The minimum theoretical safe thickness of the water-resisting layer at shaft floor was obtained according to the analysis of the catastrophe. The computed result tallied with the actual situation.
运用突变理论的分析方法，求得了井筒底板隔水层的最小理论安全厚度，这与典型案例实际情况基本相符。
Overall, accuracy of risk assessment on floor water-inrush can be improved by considering the relative water-resisting strata in Ordovician top as part of the whole ones.
将奥陶系顶部相对隔水层作为整个煤层底板隔水层的一部分进行底板突水危险性评价，可以使评价结果更准确。
Overall, accuracy of risk assessment on floor water-inrush can be improved by considering the relative water-resisting strata in Ordovician top as part of the whole ones.
将奥陶系顶部相对隔水层作为整个煤层底板隔水层的一部分进行底板突水危险性评价，可以使评价结果更准确。
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