浅埋厚基岩下综采工作面覆岩运移破断规律研究  

Study on Migration and Fracture Law of Overburden Rock in Fully Mechanized Mining Face under Shallow Buried Thick Bedrock

作　　者：张俊林 王东旭 ZHANG Junlin;WANG Dongxu(Huangyuchuan Coal Mine,CHN Energy Yili Energy Co.,Ltd.,Ordos 010300,China)

机构地区：[1]国能亿利能源有限责任公司黄玉川煤矿,内蒙古鄂尔多斯010300

出　　处：《煤炭技术》2025年第4期58-64,共7页Coal Technology

摘　　要：为了研究浅埋厚硬基岩下综采工作面覆岩运移规律,以黄玉川煤矿12407工作面为背景,采用理论分析,3DEC数值模拟的方法研究了浅埋厚硬基岩条件下综采工作面顶板破断规律与上层覆岩运移规律及裂隙发展演化。结果表明:浅埋厚基岩条件下覆岩厚硬岩层随着采动强度和悬顶长度的增加,其弯曲下沉量增大。随着工作面推进,覆岩断裂形态由初始的等腰梯形形态,发育成下等腰梯形、上横向矩形形态,且上下覆岩断裂形态分界面主要受顶板厚硬岩层位置的影响。利用分形维数理论,对其覆岩裂隙发育进行分析,得到覆岩裂隙分形维数D随着工作面推进整体呈现下降趋势,其曲线下降速率呈现慢—快—慢趋势,反映了上覆厚硬岩层破断运移过程中裂隙产生发育的规律。In order to study the migration law of overlying strata in fully mechanized mining face under shallow buried thick and hard bedrock,taking the 12407 working face of Huangyuchuan coal mine as the background,the roof fracture law of fully mechanized mining face and the migration law of upper overlying strata and the development and evolution of cracks under the condition of shallow buried thick and hard bedrock were studied by theoretical analysis and 3DEC numerical simulation.The results show that under the condition of shallow buried thick bedrock,with the increase of mining intensity and suspended roof length,the bending subsidence of thick and hard rock strata increases.With the advancement of the working face,the fracture morphology of the overburden rock develops from the initial isosceles trapezoid shape to the lower isosceles trapezoid and the upper transverse rectangle shape,and the fracture morphology interface of the upper and lower overburden rock is mainly affected by the position of the thick and hard rock strata of the roof.Using the fractal dimension theory,the development of overburden fractures is analyzed,and the fractal dimension D of overburden fractures shows a downward trend as the working face advances,and the curve decline rate shows a slow-fast-slow trend,It reflects the law of crack development in the process of fracture and migration of overlying thick and hard rock strata.

关 键 词：覆岩运移 3DEC数值模拟 裂隙拓展 分形维数 浅埋厚基岩 

分 类 号：TD325[矿业工程—矿井建设]