为了获得实施水力疏松措施后达到最佳消突效果的时间,考察了措施消突效果的时效性,首先提出了时效性的概念,并分析了其存在的原因和考察的必要性,通过对注水后不同时间的突出预测指标等相关参数的现场考察,得到了突出预测指标和瓦斯涌出量的变化规律,分析了水力疏松措施的消突机理和消突时效特征.结果表明,实施水力疏松措施后,突出预测指标和瓦斯涌出量的实测值都随时间明显减小,存在一定的时效性;实施水力疏松措施后的前3 h,突出预测指标和瓦斯涌出量降低比较明显,3～4 h后,基本不再发生变化,故认定成庄矿实施水力疏松措施后达到最佳消突效果的最短时间在3～4 h.%In order to have the time to reach the optimum outburst elimination effect after the hydraulic loosening measures made, the time effect of the measures to the outburst elimination effect was investigated.The paper first provided the conception of the time effect.The paper analyzed the existed cause and the investigation necessity.With the site investigation on the outburst predicted index and the related parameters at different time after the water injection completed, the outburst predicted indexes and the gas emission quantity variation law were obtained and the outburst eliminated mechanism and the outburst eliminated time effect features after the hydraulic loosening measures conducted were analyzed.The results showed that after the hydraulic loosening measures conducted, the outburst predicted index and the actual measured value of the gas emission quantity would ne obviously reduced with the time passed and there would be a certain time effect.At three hours before the hydraulic loosening measures conducted, the outburst predicted index and the gas emission quantity would be reduced obviously.After 3 ～ 4 hours of the measures conducted, the outburst predicted index and the gas emission quantity would be basically not changed.The paper held that the shortest time to reach the optimum outburst elimination effect after the hydraulic loosening measures made in Chengzhuang Mine would be 3 ～4 hours.
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