厚煤层错层位开采的实际应用

Application of stagger arrangement mining for thick coal

沿空留巷充填体及沿空掘巷煤柱直接支撑顶板是导致区段巷道底臌的原因之一,且维护困难,成本高昂。加之留巷充填时工艺复杂,影响了煤矿科学开采。以西山镇城底矿错层位开采为例,对其巷道布置及回采工艺进行分析。工作支架阻力及两巷超前压力等实测结果表明,工作面矿压显现由完全沿空进风巷至沿顶板回风巷呈单调递减,错层位开采进风巷超前支承压力小于回风巷,完全沿空进风巷的变形量略大于沿顶板回风巷。其回采率显著高于传统的留保护煤柱开采方式。

This paper is devoted to an alternative to backfill for gob-side entry retaining and coal till- lar supporting roof directly for gob-side entry driving, which suffers from disadvantages, such as, greater floor heave vulnerability, more difficult support, higher cost of section roadw＇ay, and more complicated filling technology when retaining roadway, affecting science mining. The paper is based on the case of Xishanzhenchengdi which applies stagger arrangement mining, and describes roadway an＇angement and mining technology and field observation of support working resistance and pilot support pressure. The re- suits show that coal pressure appearance is the monotone decreasing from gob-side intake airflow roadway to return airflow roadway along roof; that pilot support pressure is smaller; that displacement in gob-side entry is little more than in roadway along roof; main for mining as in traditional way. and that mining rate is higher than when coal pillars re-