急倾斜煤层下保护层开采的卸压效应研究  

Study on Pressure Release Effect of Mining Protecting Strata in Steep Seam

作　　者：陈宝 张坤 潘立文 黄旻鹏 饶贵仕 郑小龙 Chen Bao;Zhang Kun;Pan Liwen;Huang Minpeng;Rao Guishi;Zheng Xiaolong(Jiangxi Research Institute of Emergency Management Science,Nanchang,Jiangxi 330030)

机构地区：[1]江西省应急管理科学研究院,江西南昌330030

出　　处：《江西煤炭科技》2023年第4期1-5,9,共6页Jiangxi Coal Science & Technology

摘　　要：为了分析急倾斜煤层开采过程中上覆岩层的冒落移动范围、裂隙发育规律、被保护层的变形规律以及卸压程度,以江西省乐平矿务局北部矿区和萍乡矿务局青山、巨源矿区急倾斜煤层群的具体赋存条件为研究背景,采用ANSYS软件对急倾斜煤层下保护层开采后的采动影响区域进行了数值模拟研究。从沿层理面方向和沿层理面法向方向这两个方面,分别分析了倾角为65°和45°的煤层在保护层开采后上覆岩层的应力变化情况、位移情况以及被保护煤层的应力变化情况、位移情况,同时还研究了被保护煤层的卸压范围。此外,还针对这两种倾角不同的煤层,分析了其在相同开采条件下的顶板应力分布情况以及被保护煤层的卸压情况。研究表明:对于倾角65°的煤层和倾角45°的煤层,在应力释放区的四周两者都表现出应力有不同程度的提高,但两者的最大应力释放区位置有很大差异。受采煤工作面长度的影响,倾角45°煤层的顶板法向位移比倾角65°煤层的大,而且顶板沿倾向发生变形的范围也要大。研究结果还显示:倾角45°的煤层,其法向应力沿煤层倾向的变化比较平缓,而倾角65°的煤层,其法向应力沿煤层倾向的变化比较显著。In order to analyze the range of collapse and movement of the overlying strata,the development law of cracks,the deformation law of the protected layer,and the degree of pressure relief during the mining process of steeply inclined coal seams,taking the specific occurrence conditions of the northern mining area of Leping Mining Bureau in Jiangxi Province,the Qingshan and Juyuan mining areas of Pingxiang Mining Bureau as the research background,the authors use ANSYS software to conduct numerical simulation research on the mining impact area of the protective layer under the steeply inclined coal seam after mining,analyze the stress changes and displacement of the overlying strata of coal seams with dip angles of 65°and 45°after the mining of the protective layer,as well as the stress changes and displacement of the protected coal seam from two aspects:along the bedding plane direction and along the normal direction of the bedding plane.They also study the pressure relief range of the protected coal seam and analyze the distribution of roof stress and the pressure relief of the protected coal seam under the same mining conditions for these two types of coal seams with different dip angles,whose research shows that for coal seams with an inclination angle of 65°and 45°,both show varying degrees of stress increase around the stress release zone,but there is a significant difference in the position of the maximum stress release zone between the two.Due to the influence of the length of the mining face,the normal displacement of the roof in a 45°coal seam is greater than that in a 65°coal seam,and the range of deformation of the roof along the dip is also larger.The research results also show that the normal stress of coal seams with an inclination angle of 45°changes relatively gently along the dip of the coal seam,while the normal stress of coal seams with an inclination angle of 65°changes significantly along the dip of the coal seam.

关 键 词：急倾斜煤层 下保护层开采 卸压效应 数值模拟研究 顶板 

分 类 号：TD31[矿业工程—矿井建设] TD823.213