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秦冬冬, 陈旭阳, 王旭锋, 余锦柱. 浸水含瓦斯抽采钻孔煤柱稳定性研究及控制[J]. 矿业安全与环保.
引用本文: 秦冬冬, 陈旭阳, 王旭锋, 余锦柱. 浸水含瓦斯抽采钻孔煤柱稳定性研究及控制[J]. 矿业安全与环保.
QIN Dongdong, CHEN Xuyang, WANG Xufeng, YU Jinzhu. Study on the stability and control of coal pillars in water-bearing gas extraction boreholes[J]. Mining Safety & Environmental Protection.
Citation: QIN Dongdong, CHEN Xuyang, WANG Xufeng, YU Jinzhu. Study on the stability and control of coal pillars in water-bearing gas extraction boreholes[J]. Mining Safety & Environmental Protection.

浸水含瓦斯抽采钻孔煤柱稳定性研究及控制

Study on the stability and control of coal pillars in water-bearing gas extraction boreholes

  • 摘要: 窄煤柱护巷可有效提高煤炭资源采出率,改善采掘接替关系,但存在施工维护难度大的难题,尤其是采空区积水且矿井瓦斯含量较高的条件下,煤柱稳定性控制显得更为重要。本文基于石泉煤矿 30108 工作面沿空巷道掘进及支护的工程背景,结合钻孔可视化探测技术提出了一种基于MATLAB 图像处理的钻孔裂隙定量表征方法, 基于浸水煤柱力学模型及数值模拟综合确定了合理煤柱宽度,提出了相应支护方案并进行了工业性实践。研究结果表明,钻孔截面中裂隙面积占比随钻孔深度增大呈负对数减小趋势,煤柱宽度为 10 m 时正常区段及含瓦斯抽采钻孔区段煤柱内部均存在较大范围的弹性区,具备较强的承载能力; 提出了采空区疏水方案及“锚索网梁+窄煤柱侧索梁补强+窄煤柱侧注浆加固”的巷道高强非对称支护方案并进行了工业性实践,巷道控制效果显著,同时具有显著的经济效益。

     

    Abstract: Driving roadways along goaf with narrow coal pillars can effectively improve the recovery rate of coal resources and the mining replacement relationship, but there is a problem of great difficulty in construction and maintenance, especially under the condition of water accumulation in goaf and high gas content in the mine, the control of coal pillar stability is more important. Based on the engineering background of goaf side entry driving in the 30108 working face of Shiquan Coal Mine, this paper proposes a quantitative characterization method of borehole cracks based on MATLAB image processing in combination with the visual detection technology of boreholes, comprehensively determines the reasonable width of coal pillars in combination with the mechanical model and numerical simulation of soaked coal pillars, and proposes a targeted high-strength asymmetric support scheme and carries out industrial practice. The research results show that the proportion of fracture area in the borehole section decreases in negative logarithm with the increase of borehole depth. When the coal pillar width is 10 m, there is a large range of elastic zones in the coal pillar in the normal section and the gas drainage drilling section, which has a strong bearing capacity. The drainage scheme of goaf and the high strength asymmetric support scheme of "anchor cable mesh beam + narrow coal pillar side cable beam reinforcement + narrow coal pillar side grouting reinforcement" are put forward and put into industrial practice. The roadway control effect is significant and has significant economic benefits.

     

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