大倾角煤层长壁开采工作面飞矸致灾机理研究

飞矸是大倾角煤层一类特殊衍生灾害,严重危害工作面设备和人员的安全,探讨其致灾机理对建立大倾角煤层走向长壁工作面防护体系至关重要。在工作面飞矸灾害实测基础上开展实验室模拟,选取冲击能和能量恢复系数表征损伤,借助高清摄像机和压力传感器记录并获取冲击能;运用统计学原理分析不同工况下冲击能的演化特性;对冲击能和能量恢复系数拟合并根据曲线走势,以设备（人员）吸能量为控制对象,吸能量陡增点和极值点为界建立飞矸损伤风险判别模型,依据模型划分飞矸损伤的等级。基于以上探讨了飞矸致灾的机理,结果表明：飞矸致灾是在碰撞途径和方式耦合作用下冲击能和能量恢复系数达到相应致灾等级,致灾过程为自由落体、飞溅、滚动和滑动等状...

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Bibliographic Details
Published in煤炭学报 Vol. 42; no. 9; pp. 2226 - 2234
Main Author 伍永平;胡博胜;王红伟;解盘石;刘明;刘明银
Format Journal Article
LanguageChinese
Published 2017
Subjects
大倾角煤层
恢复系数
损伤等级评估
耦合作用
飞矸
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Summary:飞矸是大倾角煤层一类特殊衍生灾害,严重危害工作面设备和人员的安全,探讨其致灾机理对建立大倾角煤层走向长壁工作面防护体系至关重要。在工作面飞矸灾害实测基础上开展实验室模拟,选取冲击能和能量恢复系数表征损伤,借助高清摄像机和压力传感器记录并获取冲击能;运用统计学原理分析不同工况下冲击能的演化特性;对冲击能和能量恢复系数拟合并根据曲线走势,以设备（人员）吸能量为控制对象,吸能量陡增点和极值点为界建立飞矸损伤风险判别模型,依据模型划分飞矸损伤的等级。基于以上探讨了飞矸致灾的机理,结果表明：飞矸致灾是在碰撞途径和方式耦合作用下冲击能和能量恢复系数达到相应致灾等级,致灾过程为自由落体、飞溅、滚动和滑动等状态下冲击能累积,满足走向运移、高度、碰撞方位后与设备接触,冲击能转化为设备弹性能和构件间振动阻尼,造成构件的形变量大于其极限形变量时发生损坏,数值仿真手段验证了理论和实验研究中能量恢复系数取值的合理性。
Bibliography:WU Yongping1,2, HU Bosheng1 ,WANG Hongwei1, 2 ,XIE Panshi1,2 ,LIU Ming3 ,LIU Mingyin （ 1. School of Mineral Engineering,Xi＇ an University of Science and Technology,Xi＇ an 710054, China ; 2. Key＂ Laboratory of Western Mine Exploitation and Haz ard Prevention Ministry of Education,Xi＇ an 710054,China; 3. School of Mechanical Engineering, Liaoning Shihua University, Fushun 113001 ,China）
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The flying gangue is a kind of special derivative disaster in the steeply dipping coal seam,which seriously endangers the safety of the working face equipment and personnel.It is essential to discuss the disaster mechanism to establish the protection system in longwall face along strike when mining the steeply dipping coal seam.Laboratory simulation was carried out on the basis of disaster measurement of flying gangue,the impact energy and energy recovery coefficient were used to characterize the flying gangue＇s hazard,impact energy were recorded and acquired by HDV and pressure sensors.The evolution characteristics of
ISSN:0253-9993