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基于煤与瓦斯突出能量理论的钻孔造穴诱突技术及工程实践

Technology and engineering practice of borehole cavitation inducing outburst based on coal and gas outburst energy theory

  • 摘要: 基于煤与瓦斯突出能量理论,建立了突出煤体三维结构应力模型,并利用弹塑性力学相关知识和数学求解方法推导了突出煤体的瓦斯弹性势能和瓦斯内能方程,为钻孔造穴诱突技术应用提供理论依据和实现路径。现场试验了钻孔水力造穴诱突、爆破诱突2种诱突技术措施,结果表明,钻孔造穴诱突过程的能量耗散机制符合推导的瓦斯能量方程和结构应力模型。针对试验矿井实际条件,2种诱突技术措施应用时存在一个阈值,当试验矿井煤层瓦斯含量大于9 m3/t时宜采用水力造穴诱突技术,反之宜采用爆破诱突技术。实践表明,2种诱突技术措施均能使试验矿井瓦斯治理效果显著提高。

     

    Abstract: Based on the energy theory of coal and gas outburst, a three-dimensional structural stress model of outburst coal mass was established, and the gas elastic potential energy and gas internal energy equation of outburst coal mass were derived by using the knowledge of elastic-plastic mechanics and mathematical solution method, which provided a theoretical basis and implementation path for borehole cavitation inducing outburst technology. Two inducing outburst technical measures of borehole hydraulic cavitation inducing outburst and blasting inducing outburst were tested in the field. The results show that the energy dissipation mechanism of borehole cavitation inducing outburst conforms to the derived gas energy equation and structural stress model. In addition, for the actual conditions of the test mine, there is a threshold value when the two inducing outburst technical measures are applied. When the coal seam gas content of the test mine is greater than 9 m3/t, the hydraulic cavitation inducing outburst technology should be used, otherwise the blasting inducing outburst technology should be used. Practice has proved that the two inducing outburst technical measures have significantly improved the gas control effect of the test mine.

     

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