摘要
以钱家营矿典型近距离煤层群上下采空中间煤层开采为工程背景,采用相似模拟、数值模拟和现场实测相结合的方法,分析近距离煤层群重复采动影响下层间煤岩体的损伤程度与裂隙发育特征,确定上下采空中间煤层的开采可行性。研究结果表明:钱家营矿煤层群9号煤层受7号、8号、12_(-1)号煤层的重复采动影响,层间煤岩体的平均损伤程度不断增大,但整体损伤程度较低,完整性较好;上方煤层开采结束后,层间煤岩体纵向裂隙发育至中间煤层直接底位置;下方煤层开采结束后,层间煤岩体各层均出现纵向裂隙,但中间煤层及其顶底板岩体内部未出现纵向贯通裂隙,仍能保持良好的连续性与完整性;通过对中间煤层开展工业性试验可知,支架最大载荷与平均载荷分别稳定在20.16~28.88 MPa和14.83~17.32 MPa之间,未超过ZY4800-13/32型掩护式液压支架的额定工作阻力。
Based on a typical middle coal seam with the upper and lower goafs in close-multiple coal seams in Qianjiaying coal mine,the characteristics of the damage degree and the fracture development of the interlayer coal-rock mass were analyzed and the mining feasibility of the middle coal seam with the upper and lower goafs was determined,using a combination method with physical simulation,numerical simulation,and on-site measurement.The results showed that:①Due to the repeated mining of the upper and lower coal seams,the average damage degree of the interlayer coal-rock mass increased,indicating lower damage degree and good integrity of the interlayer coal-rock mass.②The longitudinal fractures in the interlayer coal-rock mass developed to the immediate floor of the middle coal seam.Longitudinal fractures emerged in each stratum of the interlayer coal-rock mass.No throughfractures were observed in the roof and floor of middle coal seam,or the seam itself.This maintained good continuity and integrity of the seam.③On-site industrial tests on the mining of middle coal seam showed that the maximum and average shield support capacity remained stable between 20.16~28.88 MPa and 14.83~17.32 MPa.These values never exceeded the rated shield support capacity of ZY4800-13/32 shield.
作者
任玉琦
李杨
雷兴海
王楠
李戬
REN Yuqi;LI Yang;LEI Xinghai;WANG Nan;LI Jian(School of Coal Engineering,Shanxi Datong University,Datong Shanxi 037003,China;The Cultivation Base of Shanxi Key Laboratory of Coal Mine Water Jet Technology and Equipment,Datong Shanxi 037003,China;School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)
出处
《矿业科学学报》
北大核心
2025年第6期1068-1077,共10页
Journal of Mining Science and Technology
基金
山西省基础研究计划(自由探索类)(202403021222261)
山西省高等学校科技创新计划(2024L305)
国家自然科学基金(52074293)。
关键词
近距离煤层群
重复采动
中间煤层
损伤程度
开采可行性
close-multiple coal seams
repeated mining
middle coal seam
damage degree
mining feasibility
