煤体水力化措施综合消突作用研究  

Study on comprehensive outburst elimination effect of hydraulic measures applied to coal mass

作　　者：陈向军[1,2,3] 杜云飞[3] 李立杨[3] 

机构地区：[1]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,北京100083 [2]煤炭安全生产河南省协同创新中心,河南焦作454000 [3]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),河南焦作454000

出　　处：《煤炭科学技术》2017年第6期43-49,共7页Coal Science and Technology

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)

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。In order to study the comprehensive outburst elimination effect of the hydraulic measures,based on the comprehensive analysis on the applied effect of the hydraulic measures,the hydraulic measures could be a fracturing type and an open cut type. In combination with the hypothesis on the comprehensive effect of the coal and gas outburst,an analysis was conducted on the hydraulic measures affected to the pressure released effect of the coal mass,gas internal energy and coal physical property.The results showed that the hydraulic measures could reduce the load stress of the coal within a certain scope.The adsorbed gas of the coal mass would be changed by the environment gas pressure and would be affected by the moisture competitive adsorption,a pressure released and adsorption and the replaced adsorption would be occurred,the water content could replace 59.14% of the absorbed gas and the gas internal energy would be reduced. After the measures applied,the moisture content of the coal mass would be increased,the elastic modulus could be reduced by 58.69%,the plastic index could be increased over 4.3 times and the elastic energy of the coal mass would be reduced.The hydraulic measures could reduce the load stress of the coal mass,gas internal energy and elastic energy of the coal mass and would have a comprehensive effect to the outburst elimination of the seam.In order to further improve the comprehensive outburst eliminated effect of the hydraulic measures,during the hydraulic measures completed,an activator injected into the water should be considered to enhance the moisture effect of the coal mass.The fracturing type measures should have the pressure released borehole to eliminate the stress concentration effect at the crack tip.

关 键 词：煤与瓦斯突出 水力化措施 卸压效应 瓦斯内能 

分 类 号：TD713[矿业工程—矿井通风与安全]