复合厚煤层孤岛工作面冲击地压的数值模拟

复合厚煤层发生冲击地压动力灾害事故,严重地影响矿山的安全生产。以南屯煤矿两边采空的9303复合厚煤层孤岛工作面为工程背景,利用Flac数值模拟软件,研究同一开采条件下,单一硬煤、软煤及复合厚煤层孤岛工作面回采过程中的采场压力分布规律,并进行对照模拟。结果表明:复合煤层支撑应力峰值小于单一硬煤和单一软媒。复合厚煤层工作面回采见方阶段时,产生明显的集中应力,易出现动力灾害事故。该研究成果在南屯煤矿实际开采中得到应用。

Composite thick seams burst numerical simulation and analysis on isolated island working face

This paper is driven by the need for a solution to the rock burst occurring in composite thickness coal seam and seriously affecting mine production safety.This solution builds on the engineering background typical of No.9303 stope in Nantun coal mine with both sides of thick coal seams which have been mined.The paper,based on Flac numerical simulation software,offers a study and comparative simulation of the law governing the distribution of the stope pressure occurring in single hard coal,soft coal and single composite thick coal seam of island face,under the same mining conditions.The results show that support peak stress is smaller for a composite coal seam than for a single seam coal and soft seam coal.When mined in the square stage,the composite thick seams tend to produce the significant stress concentration,which is more likely to trigger dynamic disasters and accidents.The study has found use in the Nantun actual coal mining.