富水条件下冲击煤体钻屑法试验研究

doi:10.13722/j.cnki.jrme.2022.0215

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摘要陕西彬长、永陇矿区冲击煤体在洛河组砂岩含水层影响下，钻屑泥化成团使得钻屑量指标难以清晰反映煤体应力状态，导致钻屑法失效，影响矿井冲击地压危险的有效监测预警。采用自主研制三轴加卸载钻进平台，以自然及含水状态煤体为研究对象，开展不同应力水平下冲击煤体钻进试验，探究富水条件下煤样钻进过程力学响应、钻孔效应及应力能量演化规律和损伤破坏模式。试验结果表明：(1) 随着含水率增加，煤体损伤破裂模式由微观结构间的“点状”摩擦损伤向软弱结构面的层间滑移、错动、摩擦转变，宏观层面表现为试样水平及垂直方向裂纹数目增加。(2) 冲击煤体动力响应频次与含水率成正相关，含水煤体弹性能储存能力相较于自然煤体有所下降，动力事件孕育过程缩短，频次增加但单次能量释放量级有所降低。(3) 自然煤体孔洞结构在应力作用下，损伤分为“移进集中”、“起裂”、“裂纹贯穿”三个阶段，随着含水率增加，试样仅表现出前两阶段特征。(4) 钻孔变形损伤范围与含水率成正相关，当含水率分别为1.4%，2.3%，3.7%时，试样沿孔心损伤半径为钻进半径的2.03，2.98，3.36倍。试验结果可为富水条件下冲击煤体钻屑量指标修正及灾害防治提供参考。

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	朱广安1
	刘海洋1
	沈威2
	刘欢1
	蒋启鹏1
	苏勃如1

关键词 ：采矿工程, 冲击地压, 钻屑法, 含水煤体, 三轴加载, 声发射

Abstract：Under the influence of Luohe Formation aquifers in Shaanxi Binchang and Yonglong mining areas，the drilling index is difficult to clearly reflect the stress state of coal mass，which leads to the failure of drilling method and affects effective monitoring and pre-warning of rock burst. Taking natural and water-containing coal mass as the research object，the coal drilling test under different stress levels was carried out by using the self-developed triaxial loading and drilling platform to explore the mechanical response，borehole effect，evolution law of stress and energy，and damage failure mode of the water-containing coal mass. The results show that：(1) With the increase of the moisture content，the damage failure mode changes from“point-like”friction damage between microstructures to interlayer slip，dislocation and friction with weak structural planes. The number of cracks in the horizontal and vertical directions increase. (2) The frequency of dynamic response is positively correlated with the moisture content. Compared with natural coal body，the elastic energy storage capacity of water-bearing coal body decreases. For dynamic event，the incubation process is shortened，the frequency is increased but the magnitude of single energy release is reduced. (3) the damage of boreholes of natural coal structure is divided into three stages as movement concentration，crack initiation and crack penetration. With the increase of the moisture content，the sample only shows the characteristics of the first two stages. (4) The damage range of borehole deformation is positively correlated with the moisture content. When the moisture content is 1.4%，2.3%，and 3.7%，respectively，the damage radius along the borehole center is 2.03，2.98，and 3.36 times the drilling radius. The test results can provide reference for the correction of drilling index and disaster control under rich water condition.

Key words： mining engineering rock burst drilling method water-bearing coal mass triaxial compression test acoustic emission

引用本文:

朱广安1，刘海洋1，沈威2，刘欢1，蒋启鹏1，苏勃如1. 富水条件下冲击煤体钻屑法试验研究[J]. 岩石力学与工程学报, 2022, 41(12): 2417-2431.
ZHU Guangan1，LIU Haiyang1，SHEN Wei2，LIU Huan1，JIANG Qipeng1，SU Boru1. Experimental research on burst-prone coal mass of drilling method under rich water condition. , 2022, 41(12): 2417-2431.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0215 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I12/2417

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