摘要
为研究封闭不良钻孔侧壁突水机理,预防水害事故的发生,以采煤工作面和封闭不良钻孔作为研究对象,探讨了封闭不良钻孔侧壁引发突水的潜在位置,利用摩尔库仑准则和厚壁圆筒理论,建立了封闭不良钻孔侧壁突水力学模型和突水判据。结果表明,煤层顶板导水裂隙带超前发育部位容易引发封闭不良钻孔侧壁突水,影响突水的主要因素有保安煤柱宽度、导水裂隙带超前发育距离、顶板的内聚力、内摩擦角、封闭不良钻孔的孔径以及孔内水压,当煤柱宽度等于或小于导水裂隙带超前发育距离与封闭不良钻孔塑性区半径之和时,将引发突水事故。
For researching the mechanism of water-inrush at side face of poor sealing borehole so as to prevent water inrush accidents , taking the coalface and poor sealing borehole as the research objects , the potential position of wa-ter-inrush at side face of poor sealing borehole was analyzed .The mechanical model of water-inrush at side face of poor sealing borehole was established by the theory of Mohr coulomb and the thick cylinder .The results showed that water-inrush at side face of poor sealing borehole easily happens in the front of water conducted fissure in roof of coal.The main factors affecting water inrush include the width of safe coal pillars , advanced development distance of water conducted fissure , roof cohesion , internal friction angle , radius of poor sealing borehole and water pressure in the borehole .The water inrush will happen when the coal pillar width is equal to or less than the sum of ad-vanced development distance of water conducted fissure and radius of poor sealing borehole .
出处
《中国安全生产科学技术》
CAS
CSCD
2014年第5期74-77,共4页
Journal of Safety Science and Technology
基金
国家自然科学基金(51204069
41072188
51074075)
关键词
封闭不良钻孔
突水机理
厚壁圆筒
力学模型
poor sealing borehole
mechanism of water-inrush
thick cylinder
mechanical model
