煤矿安全2024，Vol.55Issue(12)：188-196,9.DOI:10.13347/j.cnki.mkaq.20240025
膨胀材料配比优化及端帮采硐充实效应研究
Study on optimization of expansion material ratio and filling effect of end slope mining tunnel
摘要
Abstract
In order to solve the problem that the backfill body can not be connected to the roof in the process of end slope filling min-ing in open pit coal mine and to investigate the influence of filling rate on the deformation and failure characteristics of mining tun-nel,the effects of different contents of red mud,cement and mineral powder on different properties of the expansive filling materials and the deformation and failure of the mining tunnel under different filling rates were studied by means of laboratory test and numer-ical simulation.The results indicate that when the mass ratio of red mud,cement,and mine powder is 4:2:3,the performance of the expansive filling material is optimal;the extreme values of roof subsidence and compression of supporting coal pillars exhibit a quadratic decreasing relationship with the filling rate;when the filling rate is in the range of 80%-90%and 90%-100%,the compres-sion extremum of the supporting coal pillar decreases by about 3.5 mm and 6.5 mm,respectively,and the compression deceleration speed of the supporting coal pillar shows an increasing trend with the increase of the filling rate;under different filling rate condi-tions,the vertical stress variation of supporting coal pillars demonstrates a superimposed"saddle-shaped"distribution pattern;in the filling rate range of 80%to 100%,the development height of the plastic zone in the overlying strata decreases with the increase in filling rate,and the overall decrease rate of height accelerates with the rise in filling rate;increasing the filling rate with expansive materials significantly reduces the deformation of the roof and supporting coal pillars,narrows the plastic zone range.关键词
膨胀材料/端帮开采/充填开采/充实率/顶板变形/支撑煤柱Key words
expansion material/end-slope mining/fill mining/filling ratio/roof deformation/supporting coal pillar分类
矿业与冶金引用本文复制引用
朱敬凯,韩流,舒继森,谭照万,陈涛..膨胀材料配比优化及端帮采硐充实效应研究[J].煤矿安全,2024,55(12):188-196,9.基金项目
国家自然科学基金面上资助项目(52374144) （52374144）
