CAJ | 학술논문

充填钻孔是充填法矿山的关键工程之一,容易受到充填料浆的冲击而造成破损.金川公司数字化钻孔电视观测结果表明,充填钻孔存在一个严重破损区域,该区域位于充填钻孔内空气和料浆的接触面上.充填料浆自由降落,具有较高的末期下落速度,而以较高的动量和冲量冲击充填钻孔的内套管管壁.因此,充填钻孔的严重磨损深度,即空气与料浆的接触面高度,可以根据充填钻孔的高度、水平管道的长度、浆体的密度和水力坡度进行估算.实例研究结果表明,该估算方法具有足够的精度,有利于充填钻孔的日常管理和维护.
충전찬공시충전법광산적관건공정지일,용역수도충전료장적충격이조성파손.금천공사수자화찬공전시관측결과표명,충전찬공존재일개엄중파손구역,해구역위우충전찬공내공기화료장적접촉면상.충전료장자유강락,구유교고적말기하락속도,이이교고적동량화충량충격충전찬공적내투관관벽.인차,충전찬공적엄중마손심도,즉공기여료장적접촉면고도,가이근거충전찬공적고도、수평관도적장도、장체적밀도화수력파도진행고산.실례연구결과표명,해고산방법구유족구적정도,유리우충전찬공적일상관리화유호.
Vertical backfill drill-hole is usually a key project in an underground mine with backfill method and can be easily damaged by impact of backfill slurry.Observation of the damaged vertical backfill drill-holes in Jinchuan Nonferrous Metal Corporation (JNMC),Gansu Province,China,given by a digital drill-hole video camera,indicated that there usually exist serious wear zones in casing pipe in vertical backfill drill-hole (CVBH).It was suggested that serious wear position of CVBH should be located at an interface between air and solid-liquid mixture within CVBH.Backfill slurry falls freely and impacts the wall of CVBH near the interface with great momentum and energy coming from high speed free fall of backfill slurry.The depth of serious wear position of CVBH,i.e.,free fall height of backfill slurry in CVBH,can be estimated by the height of vertical backfill drill-hole,the length of horizontal pipeline,the density of slurry and the hydraulic gradient of pipeline system.A case study indicated that the estimation equation of serious damage depth of CVBH was of enough accuracy and was helpful for daily maintenance and management of vertical backfill drill-hole.