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小断层附近煤与瓦斯突出危险性预测

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煤与瓦斯突出危险性预测关系到瓦斯治理措施的有效实施。为提高煤层隐伏小断层附近瓦斯治理的效果，结合煤与瓦斯突出的主要影响因素，提出了小断层附近煤与瓦斯突出危险的动态分析方法，包括瓦斯地质条件勘查、瓦斯地质数值建模、采动应力场演化及煤与瓦斯突出预测等流程。以古汉山煤矿 14171采煤工作面为例说明该方法实施过程，在瓦斯地质条件精细勘查基础上构建数值模型，开展了工作面开采前，以及开采过程中的采动应力场数值模拟分析，发现煤层在开采前应力集中区出现在断层端部偏一侧部位、在开采过程中沿断层走向一侧范围出现应力集中，预测在小断层端部偏一侧 15 m范围内有煤与瓦斯突出危险，开采距断层小于 21 m范围内煤层存在煤与瓦斯突出危险，煤与瓦斯突出危险带的分布范围为区域防突措施评判和工作面预测提供了理论指导。现场实施的检验钻孔表明，瓦斯解吸指标Δh2 和钻孔瓦斯涌出初速度指标q在开采距小断层8～20 m范围内出现异常增大现象，该范围煤与瓦斯突出危险性大，与煤与瓦斯突出动态分析的结果基本吻合，佐证了该方法的有效性。研究成果为复杂构造带煤与瓦斯突出预测开辟了新思路，为相似地质条件下矿井开展瓦斯治理工作提供了技术借鉴。
Prediction of coal and gas outburst risk near small faults
The effective implementation of gas control measures depends on the accurate prediction results of coal and gas outburst risk.In order to improve the effect of gas control near small faults in coal seams,based on the main influencing factors of coal and gas outburst,a dynamic analysis method of coal and gas outburst risk near small faults is proposed,mainly including gas geological condition exploration,construction of numerical model of gas geology,mining stress field evolution and prediction of coal and gas outburst.Taking 14171 mining working face of Guhanshan Coal Mine as an example to illustrate the implementation process of the method,the numerical model is constructed on the basis of fine exploration of gas geological conditions,and the numerical simulation analysis of mining stress field before and during mining of the working face is carried out.It is found that the stress concentration area of coal seam appears on the side of the fault end before mining,and the stress concentration occurs on the side of the fault strike during mining.It is indicated that there is coal and gas outburst risk within 15 m of the side of the small fault end,and there is coal and gas outburst risk within the range less than 21 m from the mining to the fault.The distribution range of coal and gas outburst risk zone provides theoretical guidance for the evaluation of regional outburst prevention measures and the prediction of working face.The test borehole conducted in the field shows that the gas desorption index Δh2 and the gas emission initial velocity index q of the borehole increase abnormally within the range of 8-20 m from the mining to the small fault,and the coal and gas outburst risk is high in this range,which is basically consistent with the results of dynamic analysis of coal and gas outburst,which proves the effectiveness of this method.The research results open up a new idea for the prediction of coal and gas outburst in complex structural belt,and provide a technical reference for coal mine gas control under similar geological conditions.

small fault in coal seamcoal and gas outburstgas geology modelstress concentrationprediction method

关金锋、成春莲、许国胜、王建华

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贵州工程应用技术学院矿业工程学院,贵州 毕节 551700

煤层小断层 煤与瓦斯突出 瓦斯地质模型 应力集中 预测方法

贵州省省级科技计划贵州省省级科技计划贵州省青年科技人才成长项目毕节市科学技术项目

黔科合支撑[2019]2876号黔科合基础ZK[2022]一般165黔教合KY字[2022]128号毕科联合[2023]11号

2024

10.12075/j.issn.1004-4051.20230898

中国矿业
中国矿业联合会

中国矿业

CSTPCD北大核心
影响因子：0.875
ISSN：1004-4051
年,卷(期)：2024.33(6)
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