煤体水力化措施综合消突作用研究

发布时间：2018-05-24 17:47

本文选题：煤与瓦斯突出 + 水力化措施　；参考：《煤炭科学技术》2017年06期

【摘要】：为了研究水力化措施的综合消突作用,在综合分析水力化措施作用效应的基础上,将水力化措施归结为致裂类和掏槽类,结合煤与瓦斯突出综合作用假说,分别从水力化措施对煤体卸压效应、瓦斯内能以及煤的物理力学性质3个方面的影响进行了分析。结果表明:水力化措施能够降低一定范围内煤体的载荷应力;煤体吸附瓦斯受到环境气体压力的变化和水分的竞争吸附影响,发生了降压解吸和置换解吸,水分置换了59.14%的吸附瓦斯,降低了瓦斯内能;采取水力措施后煤体水分增加,弹性模量能够降低58.69%,塑性指数增大4.3倍以上,降低了煤体弹性能。水力化措施能够降低煤体承载应力、瓦斯内能和煤体弹性能,对煤层消突具有综合作用。为进一步提高水力化措施综合消突效果,提出执行水力化措施时,应考虑在注入的水中加入活性剂,增强煤体的湿润效果,致裂类措施还应采取卸压孔来消除裂缝尖端应力集中效应。
[Abstract]:In order to study the comprehensive anti-outburst effect of hydraulic measures, on the basis of comprehensive analysis of the effect of hydraulic measures, the hydraulic measures are reduced to fracturing type and cutting type, and combined with the hypothesis of comprehensive action of coal and gas outburst. The effects of hydraulic measures on coal pressure relief, gas internal energy and the physical and mechanical properties of coal are analyzed respectively. The results show that the hydraulic measures can reduce the load stress of coal in a certain range, the gas adsorbed by coal is affected by the change of environmental gas pressure and the competitive adsorption of water, and the desorption and displacement desorption occur. The moisture is replaced by 59.14% of the adsorbed gas, and the internal energy of the gas is reduced, and the elastic modulus of coal can be reduced by 58.69 times, and the plastic index increases by 4.3 times, and the elastic energy of coal is reduced by taking hydraulic measures. Hydraulic measures can reduce the bearing stress of coal body, gas internal energy and elastic energy of coal body, and play a comprehensive role in eliminating coal seam outburst. In order to further improve the comprehensive outburst suppression effect of hydraulic measures, it is suggested that when implementing hydraulic measures, active agents should be added to the injected water to enhance the wetting effect of coal. In order to eliminate the stress concentration effect at the crack tip, the pressure relief hole should be adopted.
【作者单位】：中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室;煤炭安全生产河南省协同创新中心;河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地(河南理工大学);
【基金】：国家重点研发计划资助项目(2016YFC0801402) 国家自然科学基金青年基金资助项目(51204065) 河南理工大学博士基金资助项目(B2014-002);河南理工大学青年骨干教师资助项目(72105/149)
【分类号】：TD713.3

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