“三硬”煤岩组合体冲击倾向性数值分析
Numerical Analysis of Rock Burst Tendency for "Three Hard" Coal and Rock Combination
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摘要: 采用RFPA2D对坚硬顶板、坚硬煤层、坚硬底板三体模型进行冲击倾向性数值试验研究。结果表明：坚硬顶板组合体峰值后突然失稳，易发生冲击地压；坚硬煤层组合体峰值前储存大量弹性能且瞬时释放，极易发生冲击地压；坚硬底板组合体峰后曲线呈现阶梯性缓慢下掉，不易发生冲击地压。组合体声发射能量释放分成3个阶段。坚硬顶板组合体和坚硬煤层组合体能量瞬时集中释放，坚硬底板组合体能量缓慢释放。虽然坚硬底板组合体释放总能量大于坚硬顶板组合体，但能量释放机制不同。Abstract: RFPA2D is used to carry out numerical experimental study on three-body model rock burst tendency including hard roof and hard coal seam and hard floor. The study results showed that hard roof combination became suddenly instability after peak, which is prone to rock burst; hard coal seam combination stores a large number of elasticity and releases instantaneously before the peak, it is easy to happen rock burst; the curve of hard floor combination shows a ladder-like slow down trend after peak, that it is hard to appear rock burst. Acoustic emission energy release of combination is divided into three stages: energy instantaneous concentration release of hard roof combination and hard coal seam combination energy, slow release of hard floor combination energy. Though the total energy release of hard floor combination is greater than that of hard roof combination, but it is different in energy release mechanism.
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