煤矿巷道底板锚固孔排渣机理及应用  

Deslagging mechanics and application of roadway floor anchor hole in coal mine

作　　者：张辉[1,2] 康红普[1] 徐佑林[1] 

机构地区：[1]煤炭科学研究总院开采设计研究分院,北京100013 [2]中国矿业大学(北京)资源与安全工程学院,北京100083

出　　处：《煤炭学报》2014年第3期430-435,共6页Journal of China Coal Society

基　　金：国家自然科学基金委与神华集团有限公司联合基金资助项目(U1261211);国家科技支撑计划资助项目(2008BAB36B07)

摘　　要：针对煤矿巷道底板锚固孔钻进过程中排渣困难的问题,分析了底板锚固孔钻进过程中的排渣过程,提出了底板锚固孔钻进排渣困难是由于"钻渣三区"的存在,得出"钻渣三区"是动态的依次逐步形成的,并最终同时存在;利用流体力学的基本原理,推导了冲洗液循环过程的沿程水力损失及在固液耦合作用下钻渣在冲洗液中上返的力学公式。根据现场基本情况,得出冲洗液在冲洗钻孔及排渣过程中的沿程水力损失对钻渣上返的速度vt影响极小,并确定了"钻渣三区"形成的条件。结果表明:在底板锚固孔钻进过程中,钻孔机具的选择、冲洗液流量的要求以及钻机转速、钻压的控制必须协调一致,控制钻渣聚集区的形成,在很大程度上避免钻渣聚集区的形成是加快钻进速度的关键。In view of slag-off difficult problem involve with roadway floor anchor hole drilling in coal mine, slag-off process was analyzed in the process of anchor hole drilling, boring mud three-field existence make slag-off difficult in floor anchor hole drilling was put forward, and boring mud three-field is dynamic in turn gradually formative, and sim- ultaneous existing in finally. Utilizing basic principle of hydromechanics, frictional hydraulic loss in course of flush flu- id circulate and mechanical formula of boring mud rising in flush fluid in the solid-liquid coupling effect were derived. According to the field basic condition, frictional hydraulic loss of the flush fluid minimal effecting to speed v, of boring mud rising in course of flush drilling and boring mud was obtained, and condition of boring mud three-field formation was determined. The results show that selection of drilling hole tool, requirement of flush fluid flow, rotational speed of boring machine, and control of pressure must be coordinated, and formation of boring mud gather area is controlled. In large part, avoiding formation of boring mud gather area is the key to speed up drilling velocity.

关 键 词：底板锚固孔 钻孔排渣 水力损失 钻渣三区 

分 类 号：TD353[矿业工程—矿井建设]