松散煤层综放工作面支架与围岩失稳机理  

Instability Mechanism of Hydraulic Support and Surrounding Rock for Fully Mechanized Caving Face in Soft Coal Seam

作　　者：韩昌良[1,2] 谷德忠 张农[1,2] 王龙辉[1,2] 冉智 

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州221116 [2]深部煤炭资源开采教育部重点实验室,江苏徐州221116 [3]中国矿业大学科学研究所,江苏徐州221116

出　　处：《煤矿安全》2017年第6期204-207,共4页Safety in Coal Mines

基　　金：国家自然科学基金青年科学基金资助项目(51404251);江苏省自然科学基金青年基金资助项目(BK20140198);教育部科技项目创新团队资助项目(IRT_14R55)

摘　　要：为了探寻松散煤层综放工作面放顶煤支架失衡、端面顶煤冒落及煤壁片帮的原因并对支架的适应性做出评估,结合现场实测分析了采场围岩状态及支架工作状况,计算解析了支架的受力情况与承载特征。认为支架失稳的原因为:工作面割煤高度偏高造成松散煤层大量片帮,导致端面距过大,使支架不能及时护顶,进而引发破碎顶煤严重冒落,同时顶梁上方冒落形成的空洞促使支架实际支撑力偏小,为支架歪斜提供了条件。试验点选用支架的额定支撑力可满足需求,但在该条件下前梁千斤顶额定推力1 060 kN,未能达到设计要求的1 139 kN,不能满足空顶要求。针对上述问题提出了合理的建议及改善措施。In order to seek the causes of imbalance of sublevel caving hydraulic support, top coal caving at the end face and coal rib spalling, and to evaluate the adaptability of hydraulic support, we investigated the situation of surrounding rock in stope and working status of hydraulic support with the method of field measurement. After that, the force condition of support was calculated and the hearing characters were analyzed by mechanical calculation. The results show that the reasons for the instahility of hydraulic supporl are as follows. The face-to-canopy distance caused by the large cutting height is so big that the hydraulic support cannot supporl the roof in time, so top coal broke and caved seriously, and then cavities generated on the top beam, which resulted in low holding power and skew hydraulic support. The rated resistance of supports used in the test point is sufficient, but the rated thrust three of hoisting jack in front beam is only 1 060 kN and deficient to meet the required value of 1 139 kN. Therefore, the hydraulic support cannot adapt the production condition of the working face completely. Finally, reasonable suggestions and measures were proposed to these issues.

关 键 词：松散煤层 综放工作面 液压支架 适应性 顶煤冒落 围岩失稳 

分 类 号：TD322.4[矿业工程—矿井建设]