摘要
运用相似材料模拟方法和数字散斑的测试原理,对平顶山十矿近距离下保护层开采进行模拟实验,研究保护层己18煤层开采后上覆岩层的移动规律和具有煤与瓦斯突出危险性的己15-16煤层的卸压效果。研究结果表明：己18煤层工作面开采后顶板垮落带高度约为8.2 m,裂隙带的高度约为29.7 m,且被保护层位于裂隙带的中下部;随着保护层工作面的不断开采,被保护层的垂直应力依次呈＂V＂型、＂U＂型和＂W＂型的应力分布,己15-16煤层原始应力约下降了24%;被保护层己15-16煤层的膨胀变形量为11.16‰~21.9‰。该实验为研究平顶山十矿近距离下保护层开采的卸压效果分析、覆岩移动规律和巷道布置等提供理论基础。
Using Similar material simulation experiment and digital speckle technique to simulate mining the closedistance under-protecting coal stratum in Pingdingshan tenth coal mine,and study the overlying formation ＇s movement and depressurization efficiency of Ji15-16 coal seam with coal and gas outburst hazard after mining Ji18 coal seam. The results showed that： The height of caving zone is about 8. 2 m and the height of the fractured zone is29. 7 m after the mining of Ji18 coal seam,and protected seam is located in the lower part of the fractured zone; the style of stress distributions of protected seam is ＂V＂＂U＂and ＂W＂with mining protective layer,and the original stress of Ji15-16 seam has declined by about 24%; The swelling deformation rate of protected Ji15-16 coal seam is11. 16 ‰-21. 9 ‰. The experiment provides theory basis for the effect on pressure relief,the overlying formation＇s movement and roadway layout of lower protective seam mining analysis in Pingdingshan tenth coal mine.
出处
《中国地质灾害与防治学报》
CSCD
2016年第1期147-152,共6页
The Chinese Journal of Geological Hazard and Control
基金
国家青年科学基金资助项目:煤与瓦斯突出的动力系统和能量机制研究(51304110)
关键词
煤与瓦斯突出
下保护层
覆岩运动
应力变化
膨胀变形
coal and gas outburst
under-protecting coal stratum
overlying strata movement
stress change
swelling deformation
