摘要
基于煤与瓦斯突出机理,本文分析了石门揭煤过程煤与瓦斯延时突出全过程及其动力源,阐述了地应力和瓦斯压力在延时突出过程中的作用及其对含瓦斯煤体流变失稳及能量变化关系,并分析了延时突出动力源形成的能量聚集过程。结果表明,煤与瓦斯延时突出不但与卸压区、应力集中区的强度、长度有关,而且与作用在煤体上的应力峰值和瓦斯压力等因素有关;煤与瓦斯延时突出动力源大致有煤层地应力、煤体中的瓦斯及瓦斯内能、煤体物理力学性质及外作用等,延时突出动力源形成过程是复杂而又多变的,瓦斯、地应力是煤与瓦斯延时突出中的主要能量,因此降低瓦斯压力、瓦斯内能和地应力,是减少煤与瓦斯延时突出的根本办法。
Based on the gas and coal outburst mechanism, the process and its dynamic sources of gas and coal delay outburst in uncovering coal seam in cross-cut are analyzed; the effect of ground stress and gas pressure on delay outburst, energy change relation and dynamic source formation process are expatiated. From the accidents causes and theoretical analysis, it shows that the delay outburst is not only related with the intensity and length of stress-relaxation zone and stress concentration zone, but also with the gas pressure and stress peak; the dynamic sources includes the coal seam ground stress, gas pressure, gas internal energy, external force and coals＇ physical-mechanical properties. The formation process of dynamic sources is complex and polytropic, the gas and ground stress are the main energy, therefore, decreasing gas pressure, gas internal energy and ground stress are the basic way to reduce the delay outburst. The results can offer theoretical and technological support for fast uncovering coal seam in cross-cut.
出处
《中国矿业》
北大核心
2009年第1期101-103,共3页
China Mining Magazine
基金
国家自然科学基金重点项目(50674047
50534090
50574093
50604008)
国家重点基础研究发展计划(2005cb221506)
湖南科技大学博士基金(E50803)资助
关键词
煤与瓦斯突出
动力源
延时突出
石门揭煤
gas and coal outburst
dynamic source
delay outburst
uncovering coal seam in cross-cut
