部分充填开采围岩活动规律分析

Analysis of Surrounding Rock Activities in Partial Backfill Mining

采用适于分析采动影响裂隙岩体活动规律的数值模拟软件UDEC,详细分析了部分充填开采时围岩应力和位移变化规律及特点,重点分析了不同充填方式与关键层断裂的关系,以及不同充填方式对部分充填开采围岩稳定性的影响.研究结果表明,充填空顶间隔大小、充填条带宽度是部分充填开采围岩稳定性的两个主要影响因素.后期开采的条带将扩大先期开采条带的影响,尤其是后期开采两充填条带之间的条带并不充填时,这种影响更大.最后对具体的充填开采方法提出了建议.

Variation and characteristics of stress of surrounding rocks in partial backfilling style were analyzed by using UDEC, a software suitale for digital simulation. Relationship between different backfill styles and rupture of key rock stratum, influence of different backfill styles to stability of surroundings rock with partial backfill were also analyzed. The result shows that the gap between stowing and roof and the stowing width are two main effects on the surroundings rock stability in partial backfill style. Effect caused by earlier strip will be enlarged by late strip. Especially when the room between two strips stowed are mined without filling, this effect is more serious. At last, some suggestions were raised for the concrete backfill mining.