摘要
以晋城矿区开采9^#煤层作为3^#煤层下保护层为工程背景,采用数值模拟手段研究下保护层开采上覆煤岩体卸压效果及被保护层煤体膨胀变形规律,并确定有效保护范围。研究结果表明:保护层回采后,上覆煤岩体具有分区卸压效应,卸压效果随与工作面垂直距离增加而降低;被保护层倾向卸压角为63°,走向卸压角为60°;采空区中部被保护层膨胀变形率保持在4‰左右,为稳定卸压区域。现场工业试验后,钻孔电视发现被保护层煤体受采动影响产生离层裂隙;煤层瓦斯参数测定指出被保护层煤体瓦斯含量、瓦斯压力分别降低至开采前50%和60%。
In order to explore the pressure relief effect of mining under protective seam on overlying strata in Jincheng Mining Area,the engineering background of mining 9~#coal seam as the protective seam of 3~#coal seam was studied.The effect of pressure relief of overlying coal and rock mass and the law of swelling deformation of coal mass in protected seam after mining of lower protective seam are studied by numerical simulation,and the effective protection scope is determined.The results show that after the mining of protective seam,the pressure relief effect of overlying coal and rock mass appears in different zones,and the pressure relief effect decreases with the increase of vertical distance from the working face.The inclined pressure relief angle of the protected seam is 63 degrees and the strike pressure relief angle is 60 degrees.The swelling deformation rate of the protected seam in the middle of the goaf is about 4‰,which is a stable pressure relief area.After field test,it was found by borehole television that coal of the protected seam appears separation fissure affected by mining.The coal seam gas parameters shows that the gas content and gas pressure of the protected seam are reduced to 50%and 60%before mining,respectively.
作者
邓广哲
付英凯
杨东
DENG Guangzhe;FU Yingkai;YANG Dong(School of Energy Resource,Xi’an University of Science and Technology,Xi'an 710054,China;Key Laboratory of Western Mines Mining and Hazard Prevention of the Ministry of Education,Xi'an 710054,China;China Coal Technology and Engineering Group Shenyang Research Institute,Shenyang 110016,China;State Key Laboratory of Coal Mine Safety Technology,Fushun 113122,China)
出处
《煤矿安全》
CAS
北大核心
2020年第9期174-178,186,共6页
Safety in Coal Mines
基金
国家自然科学基金资助项目(51304119)。
关键词
下保护层
膨胀变形
保护范围
数值模拟
钻孔电视
lower protective seam
swelling deformation
protection scope
numerical simulation
borehole television
