急倾斜中厚煤层长壁综采工作面覆岩运移规律  

Overlying strata migration law of longwall fully mechanized mining face with steely inclined medium-thickness coal seam

作　　者：张浩[1,2] 张晓波[3] 解盘石 郎丁[1,2] ZHANG Hao;ZHANG Xiaobo;XIE Panshi;LANG Ding(School of Energy,Xi’an University of Science and Technology,Xi’an 710054,China;Key Laboratory of Western Mine Exploitation and Hazard Prevention of Ministry of Education,Xi’an 710054,China;Chongqing Energy Investment Group Science&Technology Co.,Ltd.,Chongqing 400061,China)

机构地区：[1]西安科技大学能源学院,陕西西安710054 [2]西部矿井开采及灾害防治教育部重点试验室,陕西西安710054 [3]重庆能源投资集团科技有限责任公司,重庆400061

出　　处：《陕西煤炭》2021年第1期22-25,共4页Shaanxi Coal

基　　金：国家自然科学基金重点项目(51634007);山东省重大科技创新工程项目(2019JZZY020326)。

摘　　要：急倾斜煤层综采工作面"支架-围岩"系统动态稳定性控制难度大,而顶板的行为状态会直接影响该系统稳定性,从而制约该类煤层高效机械化生产,故研究急倾斜中厚煤层长壁综采工作面覆岩运移规律十分必要。综合采用相似材料试验法、理论分析法,研究分析工作面覆岩破坏及矿压分布、演化规律。研究结果表明,急倾斜中厚煤层综采工作面上、下端头顶板垮落形式不同,上、下部垮落形态分别呈锐角三角形状、钝角三角形状,顶板垮落后会形成阶梯状岩梁;采空区充填状态走向上区域性异化,靠近煤壁侧采空区中部会形成露空区,随着距煤壁距离增加,采空区矸石堆积量及压实度升高,堆积形态更为均匀;工作面矿压非对称分布,具体表现为中、上部>下部;工作面初次来压步距为25 m,周期来压步距平均为9.22 m,来压和未来压时平均支架阻力分别为3 453 kN、2 682.8 kN。It is difficult to control the dynamic stability of“support-surrounding rock”system in fully mechanized working face of steep coal seam,and the roof state will directly affect the stability of the system,thus restricting the efficient production of this kind of coal seam.Therefore,it is necessary to study the overlying strata migration law of longwall fully mechanized working face with steep medium-thick coal seam.By using similar material simulation test and theoretical analysis method,the failure law of overburden rock and the distribution law of ground pressure are studied.The results show that the upper and lower caving forms of fully mechanized mining face in steep medium-thick coal seam are in the shape of acute triangle and obtuse triangle respectively,and the collapsed roof will form ladder-shaped rock beam;the central part of goaf near the coal wall forms open area,and with the increase of the distance from the coal wall,the amount and compaction of gangue in goaf increases,and the accumulation form becomes more uniform;the ground pressure of the working face presents asymmetric distribution,which is strong in the middle and upper part;the working face’s first weighting step distance of is 25 m,the average periodic weighting step distance is 9.22 m,and the average support resistance is 3453 kN and 2682.8 kN respectively during weighting and normal condition.

关 键 词：急倾斜 中厚煤层 综采 覆岩运移 矿压规律 

分 类 号：TD32[矿业工程—矿井建设]