摘要
为确定抽放钻孔的卸压范围,建立了考虑煤的塑性软化和扩容特性的钻孔周围煤体弹塑性模型,得到了钻孔周围煤体的应力分布和卸压范围的表达式,利用Comsol软件对建立的数学模型进行求解,对比分析了软硬煤层钻孔的应力分布特征,找出了抽放钻孔卸压范围的影响因素.研究结果表明:在研究钻孔周围煤体的受力特征时,应考虑煤的塑性软化和扩容特性;软煤层钻孔具有更好的卸压效果,硬煤层钻孔更易形成应力集中;煤体硬度、埋藏深度和钻孔孔径是控制钻孔卸压范围的主要影响因素.
In order to study on drainage borehole relief range, the elastoplastic model around the borehole considering plastic softening and dilatancy was established. The expressions of stress and pressure relief range were obtained and solved by using Comsol software. The stress distribution of the hard and soft coal seam borehole was comparatively analyzed, and the main influencing factors of borehole relief range were found out. The results show that the plastic softening and dilatancy of coal should be considered during study on drainage borehole relief range; the boreholes in soft coal seam have better pressure relief and hard coal seam drilling is easier to form stress concentration; coal hardness, burial depth and the borehole aperture is the main factors affecting borehole relief range.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2013年第12期1599-1604,共6页
Journal of Liaoning Technical University (Natural Science)
基金
国家科技支撑计划专题基金资助项目(2012BAK09B02-1)
河南理工大学博士基金资助项目(648088)
关键词
抽放钻孔
卸压范围
应力分布
塑性软化
扩容特性
软硬煤
埋藏深度
钻孔孔径
gas drainage borehole
relief range
stress distribution
plastic softening
dilatancy
soft and hard coal
burial depth
borehole aperture
