新型充填材料在特厚煤层巷道高冒区的应用

New Backfill Material Applied to High Roof Falling Zone of Ultra Thick Seam Gateway

为了解决厚煤层综放开采时引起巷道高冒区危险的问题,在分析高冒区成因和危害的基础上,研发了一种新型高冒区充填材料,并结合巷道高冒区具体情况选用合适的充填工艺。现场应用结果表明:该充填材料具有轻质不燃的特性,3 d抗压强度达到1.4 MPa,膨胀率为6%～8%,通过钻孔窥视可知高冒区充填体内部致密,没有裂隙和断裂,充填体能够很好地与高冒区顶部黏结,在周期来压和采动的影响下,高冒区充填体不会发生变形和离层,该充填材料和充填工艺能够很好地解决高冒区安全问题。

In order to solve the highroof falling zone danger problems of the mining gateway occurred in the fully mechanized top coal ca-ving mining in thick seam, based on the analysis on the cause of the high roof falling zone and danger, a new backfill material of high roof falling zone was developed. In combination with the certain conditions of the high roof falling zone in the gateway, a suitable backfill tech- nique was selected. The site application results showed that the backfill material could have the features of the material with the light weigh and non-combustion, the compressive strength after three days could reach at 1.4 MPa and the swelling rate could be 6% ~ 8%. The borehole sight showed that the backfilled material in the high roof falling zone was compact with no crack and broken and the back- filled material were well bond with the roof of the high roof falling zone. Under the influences of the periodical pressure and mining activi-ties, there were no deformation and bedding occurred in the backfilled material of the high falling zone. The backfill material and the backfill technique could well solve the existed problems of the high roof falling zone.