Study of roof stability of the end of working face in upward longwall top coal
Study of roof stability of the end of working face in upward longwall top coal
复制标题
上行长壁顶煤工作面端部顶板稳定性研究
DOI：
10.1007/s12517-017-2978-0
复制
发表时间：
2017
影响因子：
--
通讯作者：
Zhenqian Ma
中科院分区：
文献类型：
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作者：
De-zhong Kong;Wei Jiang;Yi Chen;Zheng-yang Song;Zhenqian Ma
长壁放顶煤回采率低一直是该采矿方法的工程难点之一，制约了该采矿方法的应用。工作面端空区剩顶煤占煤损总量的很大一部分，工作面端剩顶三角煤的失稳问题长期威胁着矿工的生命安全和矿山设备的安全。本文以瑞龙矿为工程背景，采用理论分析、数值模拟和现场实测相结合的方法，对工作面末端顶板的稳定性进行了探讨。结果表明：在倾斜长壁放顶煤工作面，顶板垮落后直接顶板形成“拱”结构，基本顶板形成“砌体梁”结构；用极限承载力法计算的支座工作阻力足以满足顶荷载的要求；煤柱顶板荷载与关键块体长度和断裂位置有关；增大煤柱尺寸可以保证煤柱和顶板的稳定性。
Low recovery of longwall top coal caving (LTCC) remains one of the most difficult engineering problems in this mining method and impedes its application. The top coal left in the gob at face end accounts for a large portion of the total coal loss, and the instability of the leftover triangle coal at face end has long been a threat to the safety of miners and the mining equipment. In this paper, based on the engineering background of Ruilong mine, we explore the stability of the roof at the end of the face by using theoretical analysis, numerical simulation, and field measurement. Results reveal that in the inclined longwall top coal caving face, the immediate roof forms an “arch” structure, and the basic roof forms a “masonry beam” structure after the roof collapses; working resistance of the support calculated by the method of ultimate bearing capacity was adequate to meet the requirement of roof load; roof load of coal pillar was related to the length of key block and fracture position; and increasing the size of coal pillar could ensure the stability of both coal pillar and roof.