利用矸石充填置换开采条带煤柱的新技术

The new technology of waste-filling replacement mining on strip coal pillar

提出了在煤柱中掘进巷道并利用矸石回填以置换开采出部分条带煤柱的新技术.研究了条带开采后煤柱中充填巷的布置位置、数目,并分析了置换开采前后上覆围岩的稳定性.提出在条带煤柱集中布置2条宽4.0 m、高5.0 m的矸石充填巷,巷间煤柱宽4.0 m,并进行了工程实践.结果表明,提出的矸石置换开采技术可有效控制地表变形在Ⅰ级的前提下,置换开采出条带开采留设煤柱的15%左右的煤量,同时实现矿井矸石井下处理,做到矸石不上井.

New technology droved roadways in strip coal pillar and filled coal refuse in them was put forward.The place and number of waste-filling roadways was studied, and overlying strata structure before and after replacement mining was analyzed. Based on the principia that core exists in pillar after replacement mining, two filling roadways were laid together in center with high-width size of 4.0 and 5.0 m, and the pillar width of 4.0 m in filling roadway, this technical project was practiced in a coal mine. The results show that under the precondition which the earth＇s surface deformation can be controlled in Grade I, the waste-filling replacement technology can recover about 15% of the strip coal pillar, and the coal refuse is disposed under ground.