Coal pillar characteristics and its mechanism of Strip Wongawilli mining

被引：0
|
作者：
Tan Y. [1 ,2 ,3 ]
Guo W. [1 ,2 ,3 ]
Bai E. [1 ]
Yang D. [1 ]
Wang B. [1 ]
机构：
[1] College of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo
[2] Henan Key Laboratory for Green and Efficient Mining & Comprehensive Utilization of Mineral Resources, Henan Polytechnic University, Jiaozuo
[3] Synergism Innovative Center of Coal Safety Production in Henan Province, Jiaozuo
来源：
Meitan Xuebao/Journal of the China Coal Society | 2019年 / 44卷 / 04期
关键词：
Coal pillar; Coal pillar instability; Failure characteristics; Roof abscission layer; Strip Wongawilli mining;
D O I：
10.13225/j.cnki.jccs.2018.0457
中图分类号：
学科分类号：
摘要：
The strip Wongawilli Mining method is a new type of high-efficiency subsidence reduction mining method in China, which is of great significance for reducing the damage of overburden rock, controlling surface subsidence and reducing the damage of mining to surface structures. The coal pillar is the key to control subsidence by Strip Wongawilli mining. In order to study the coal pillar characteristics and the interaction mechanism between coal pillar system and roof in strip Wongawilli mining, the Wangtaipu mine was taken as geological model. Theoretical analysis, similar simulation and site measurement were combined to build a systematic model in strip Wongawilli mining. The failure characteristics of coal pillars in Strip Wongawilli mining were observed, and the mechanical structure model of strip coal pillar and irregular coal pillar were set up. Then the roof abscission layer and coal pillar stress and support strength were analyzed. The results show that the strip Wongawilli mining method is a special pillar system formed by narrow pillars, irregular pillars and strip pillars. The narrow pillars play a temporary supporting role. With the advance of coal mining face, the narrow pillars lose their supporting capacity after mining or in a short time, irregular pillars can play a certain role in the support of roof, and strip pillars are the key of the whole pillar system. In strip Wongawilli mining, direct roof separates from main roof, and direct roof bends and subsides to form two kinds of structures, one is to bend down to form a clamped beam, and the other is to form a cantilever structure, which applying force to strip Wongawilli coal pillars. The strip coal pillars are similar to the traditional strip coal pillars, supporting the direct roof and the old roof. The irregular coal pillars are similar to the form of supporting monomers (similar to monomers) passively supporting direct roof. If irregular coal pillars fail, the abrupt change of compression of strip coal pillars will increase sharply, which will affect the stability of the whole strip Wongawilli mining pillar system. © 2019, Editorial Office of Journal of China Coal Society. All right reserved.
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页码：1003 / 1010
页数：7
相关论文
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