岩爆前ra值增加，岩爆时降低。
The RA values increase before rockburst and decrease during rockburst.
在砂岩发生岩爆前，b值下降到最低值。
Before the sandstone rock burst occurred, b-value decreased to be the lowest.
爆前试验证明了钻孔底部柔性垫层的隔震作用。
The partition function of flexible cushion on the bottom of explosive holes was proved by experiments before explosion.
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