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常用的最大钻屑量指标仅仅反映了某一点的应力情况,而动力灾害的发生主要是由于应力状态的突然改变产生的,也就是应力变化梯度的大小是决定灾害发生的主要原因。因此,提出了考察应力变化情况的新的钻屑量指标,即钻屑增量变化指标。结合采掘工作面支承压力的分区特点,在整体把握钻屑增量指标的前提下,着重把握2个拐点处量值的变化。理论分析和实践证明,采用钻屑增量指标,再辅以最大钻屑量指标,则可更好的反映工作面的应力变化情况,从而能够更为准确的预测工作面灾害发生的可能性。
The commonly used index of maximum drill cuttings only reflects the stress situation at a certain point. However, the occurrence of dynamic disasters is mainly caused by the sudden change of stress state, that is, the magnitude of the stress gradient is the main factor that determines the disaster. Therefore, a new index of drill cuttings, which is a measure of the change of cuttings, is proposed. Combined with the characteristics of bearing pressure subsidence in mining face, under the premise of overall understanding of incremental indicators of cuttings, the changes in the values at two inflection points are emphasized. Theoretical analysis and practice prove that the incremental drilling cuttings index and the maximum drilling cuttings index can better reflect the stress changes of the working face so as to predict the possibility of disaster in the working face more accurately.