大采高大倾角工作面煤壁片帮机理分析 |
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引用本文: | 李立,于雷,张世青,张霜玉.大采高大倾角工作面煤壁片帮机理分析[J].煤炭工程,2020,52(12):102-107. |
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作者姓名: | 李立 于雷 张世青 张霜玉 |
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作者单位: | 1. 中国矿业大学(北京)资源与安全工程学院;2. 中煤科工集团国际工程有限公司; |
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基金项目: | 天地科技股份有限公司科技创新创业资金专项项目 |
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摘 要: | 为研究大倾角大采高工作面煤壁片帮机理,控制煤壁片帮。建立大采高大倾角条件下的煤壁片帮模型,利用压杆失稳理论解释煤壁片帮现象。通过理论计算得出了大采高大倾角工作面煤壁片帮临界力以及片帮最易发生的位置,分析了倾角、采高与片帮临界力和片帮位置的关系。结果表明:煤壁片帮临界力与采高和煤体自身刚度有关,与煤层倾角无关。采高越大,煤壁片帮临界力越小,煤壁抗弯刚度越大,煤壁片帮的临界力越大。煤壁片帮发生的位置受煤壁自身刚度、顶板压力、煤层倾角、采高的影响,但主要由采高决定,煤壁最易片帮位置距离顶板约0.398倍采高处。此外,现场观测了攀枝花煤矿11073大采高大倾角工作面的煤壁片帮现象,现场观测与理论分析结果一致。现场采用提高支架工作阻力等措施,有效地控制了煤壁片帮现象。
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关 键 词: | 大采高 大倾角 工作面 煤壁片帮 压杆失稳 煤壁稳定性 |
收稿时间: | 2020-01-17 |
修稿时间: | 2020-04-24 |
Analysis on Spalling Mechanism of Coal Wall of Large Angle and High Cutting Coal Mining Face |
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Abstract: | Abstract:To make clear the spalling mechanism of coal wall in high cutting and large angle mining face, the model of coal wall spalling was established and Strut-and-Tie theory was used to explain the coal wall spalling phenomenon. By theoretical calculation, the critical force and most prone positon of coal wall spalling was generated. The relationship between mining height, dip, critical force and position of coal wall spalling were analysed. The results showed that: The critical force is related to the mining height and the stiffness of the coal body, and has nothing to do with the coal seam dip. The higher the mining height, the smaller the critical force, the greater the bending stiffness of the coal wall, and the greater the critical force. The position of coal wall spalling is influenced by the stiffness of coal, roof pressure、coal seam dip and mining height and mainly determined by the mining height. The most prone position is 0.398h below the roof. Moreover, the coal wall spalling was investigated in 11073 mining face in Panzhihua mines which are basically consistent with the theoretical analysis. Measures such as increasing the support pressure were taken and the coal wall spalling was controlled effectively. |
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