巨厚松散层薄基岩工作面覆岩载荷传递特征研究  

Study on load transmission characteristics of overburden rock above coal mining face in thin bedrock of super thick unconsolidated stratum

作　　者：李江华 许延春[4] 姜鹏 廉玉广 牟义 

机构地区：[1]煤炭科学技术研究院有限公司安全分院,北京100013 [2]煤炭资源高效开采与洁净利用国家重点实验室,北京100013 [3]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [4]中国矿业大学(北京)资源与安全工程学院,北京100083

出　　处：《煤炭科学技术》2017年第11期95-100,共6页Coal Science and Technology

基　　金：国家科技重大专项资助项目(2016ZX05045001-004);国家自然科学基金资助项目(51674142);煤炭科学研究总院基础研究基金资助项目(2017JC07)

摘　　要：基于华北部分矿区巨厚松散层、薄基岩工作面突水溃砂和压架事故的特点,为对赵固矿区覆岩采动破坏的"两带"高度预计、水害预测预报及支架选型的确定提供依据,运用关键层理论建立了硬岩复合破断上覆岩层载荷传递力学模型,推导出复合硬岩及上覆岩层载荷传递系数;根据研究区地质特征建立了地质力学模型,通过数值分析研究了薄基岩工作面开采覆岩的载荷传递效应和覆岩破坏特征。研究结果表明,厚松散层薄基岩工作面硬岩复合破断时上部硬岩与上覆岩层载荷传递系数为0.24~0.30;煤层覆岩采动破坏后水平切面上呈"O—X"型破断;工作面覆岩破坏的垮采比为3.85,裂采比为12;岩层移动角约为70°;工作面两端采动裂隙成为突水溃砂的主要通道。Based on the characteristics of mine water inrush and sand inrush and the powered support jammed accident occurred in a coal mining face in thick unconsolidated stratum and thin bedrock of partial mining area in North China,in order to provide references to estimate failure ＂two zones＂height in the overburden rock by mining operations,to predict and overcast the mine water disaster and to set up powered support selection,a key strata theory was applied to establish a load transmission mechanics model of hard rock complicated breaking overburden rock strata and to infer load transmission coefficients of complex hard rock and overburden rock strata. According to geological characteristics in the study area,a geological mechanics model was established. A numerical analysis was applied to study load transmission effect of mining overburden rock in coal mining face in thin bedrock and overburden rock failure characteristics. The study results showed that load transmission coefficients of top hard rock and overburden rock strata were 0.24 - 0.30 when the hard rock above coal mining face in thin bedrock of thick unconsolidated stratum was complex breaking. When the overburden rock above seam was failure by mining operation,the horizontal section would be an＂O-X＂type breaking. A caving and mining ratio of overburden rock failure above coal mining face was 3.85 and the fracture and mining ratio was 12. A displacement angle of rock stratum was about 70°. The mining fractures at two ends of coal mining face would be major channels of mine water inrush and mine sand inrush.

关 键 词：厚松散层 薄基岩 载荷传递 覆岩破坏 

分 类 号：TD324[矿业工程—矿井建设]