摘要
为了研究巨厚煤层综放开采条件下覆岩裂隙演化规律及上覆临近采空区二次演化特征,实验以新疆某高瓦斯矿井(9-15)06及(9-15)08工作面为原型,利用自主研发的二维物理相似模拟实验台,开展巨厚煤层综放开采上覆临近采空区裂隙场二次演化实验,结果表明:(9-15)06工作面采空区不规则冒落带距煤层底板58.8 m,规则冒落带距煤层底板84.12 m,上覆岩层裂隙网络分形维数随工作面持续推进表现为快速增长、稳定增长两个阶段;分层开采过程中,距(9-15)06采空区40 m范围内,(9-15)08工作面底板应力集中系数急剧升高。上覆临近采空区裂隙场受(9-15)08工作面采动影响呈现明显的区域性,结合水平裂隙密度、离层量、下沉量等关键参数的二次演化规律将其划分为强滑移区、弱滑移区、未滑移区。强滑移区纵向空间内上覆岩层变形破坏剧烈,而弱滑移区在纵向空间内上覆岩层变形破坏呈现“上弱下强”的特征,上述研究结果为初步探索巨厚煤层综放开采理论与技术体系提供一定的基础。
In order to study evolution law of overburden fractures and secondary evolution characteristics of overlying adjacent goafs during fully mechanized caving of extremely thick coal seams,with working faces(9-15)06 and(9-15)08 of a high gas mine in Xinjiang as the prototype,using the secondary evolution experiments of fracture field of overburden adjacent goafs during fully mechanized caving of the extremely thick coal seams were carried out with self-developed two-dimensional physical similarity simulation experiment platform.The results have shown that irregular caving zone in the goaf of working face(9-15)06 was 58.8 m away from the coal seam floor,and regular caving zone was 84.12 m away.With continuous advancement of the working face,there appear two stages in the fractal dimension of overburden fracture network:rapid growth and steady growth.During slicing mining,within 40 m from goaf(9-15)06,stress concentration factor in the floor of working face(9-15)08 increases sharply.The fracture field of overburden adjacent goafs,affected by the mining of working face(9-15)08,becomes obviously regional.Based on such secondary evolution laws of key parameters as horizontal fissure density,layer separation,and subsidence,the region is divided into strong slip zone,weak slip zone,and non-slip zone.Deformation and failure of overlying strata in longitudinal space of strong slip zone is severe,while that in longitudinal space of weak slip zone is featured by being“weak up and strong down”.The aforementioned research results can provide foundation for preliminary exploration of theoretical and technical system of fully mechanized caving mining of extremely thick coal seams.
作者
赵鹏翔
王超
李树刚
王绪友
林海飞
姜亦武
李磊
宁廷洲
ZHAO Pengxiang;WANG Chao;LI Shugang;WANG Xuyou;LIN Haifei;JIANG Yiwu;LI Lei;NING Tingzhou(School of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an,Shaanxi 710054,China;Key Laboratory of Western Mine Mining and Disaster Prevention,Ministry of Education,Xi'an University of Science and Technology,Xi'an,Shaanxi 710054,China;Yankuang Xinjiang Energy and Chemical Co Ltd,Urumqi,Xinjiang 830010,China;Yankuang Xinjiang Mining Co Ltd,Liuhuanggou Coal Mine,Changji,Xinjiang 831100,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2022年第1期13-24,共12页
Journal of Mining & Safety Engineering
基金
国家自然科学基金重点项目(51734007)
国家自然科学基金面上项目(51974237,51674192)。
关键词
巨厚煤层
上覆临近采空区
覆岩裂隙
二次演化
extremely thick coal seam
overburden adjacent goafs
overburden fractures
secondary evolution
