大采高采场周期来压顶板结构稳定性及动载效应分析  

Analysis of structure stability of main roof and dynamic loading effect during periodic weighting in a large mining height stope

作　　者：杨胜利[1] 王兆会[1] 吕华永 YANG Shengli;WANG Zhaohui;LYU Huayong(Faculty of Resource and Safety Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China)

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083

出　　处：《采矿与安全工程学报》2019年第2期315-322,共8页Journal of Mining & Safety Engineering

基　　金：国家重点研发计划项目(2017YFC0603002);国家自然科学基金项目(51974264)

摘　　要：为提高大采高采场围岩控制效果,采用相似模拟、理论分析及现场实测手段对顶板结构稳定性及动载冲击效应产生机理进行了研究。结果表明:大采高采场初次来压、周期来压期间基本顶形成类似的静定三铰拱结构,结构失稳后,对工作面支架产生影响的岩层范围增加,引发采场来压和顶板动载冲击现象;得到周期来压期间基本顶结构的极限承载能力、回转失稳极限位置、滑落失稳危险点及失稳发生条件;根据能量守恒和动量定理推导出基本顶结构不同失稳类型条件下冲击用时和冲击作用力的解析表达式,揭示了动载效应产生机理,并对8101工作面动载冲击现象进行了分析。To improve the control effect of surrounding rocks in similar stopes, analog simulation, theoretical analysis and field measurements have been carried out to analyze roof structure stability and the mechanism of dynamic load impact generated. The results have shown that similar static three-hinged arches will form in main roof structures during first and periodic weightings;the instability of the structure will lead to the increase of roof scope which affects the support in the working face and causes weighting phenomenon or even dynamic load of the main roof. The ultimate bearing capacity of the structure, limit position of rotation instability, the risky point of sliding instability, and the conditions for structure instability have been obtained. According to energy conservation principle and momentum theorem, the analytical expression of impact time and impact force under different instability types has been deduced, explaining the mechanism of dynamic load. At last, dynamic load shock phenomenon in mining face 8101 has been analyzed.

关 键 词：基本顶 周期来压 结构稳定性 承载能力 动载荷 

分 类 号：TD353[矿业工程—矿井建设]