摘要
针对扎哈淖尔露天矿北帮上部受到松散土层的影响,致使北帮无法达到设计边坡角,造成边帮压煤炭无法安全回采的问题,基于极限平衡及强度折减理论,采用刚体极限平衡软件和FLAC3D数值模拟软件相结合的方法,通过不断调整边坡参数逐阶段的优化设计了11煤底板以上、11煤底板至43煤底板两个阶段稳定边坡形态参数,探讨了边坡角度对边坡稳定性的影响规律,揭示了其滑坡机理。结果表明:北帮边坡滑坡模式为以43煤层底板弱层为底界面的切层-顺层滑动;最终确定北帮陡帮角度为36°,11煤底板以上边坡角度为21°,边坡形态为双折线型;陡帮开采共计可多回采压煤9.827 6×106t,经济效益显著,同时为类似条件下端帮残煤回采提供了借鉴。
In view of the influence of loose soil on the upper part,the slope angle of north slope can not reach the designed one,resulting in that the coal underlying the slope can not be safely recovered in Zhahanao er open-pit mine,the ending slope above the floor of 11 coal and the floor of 11 coal to the floor of 43 coal are optimized segmentally,the influence of slope angle on the slope stability is discussed and the mechanism of slope deformation and failure is illustrated with rigid body limit equilibrium and numerical simulation with FLAC 3D by constantly adjusting the slope parameter based on limit equilibrium and strength reduction theory.The results show that the slope landslide model of northern slope is cutting-bedding slip,which was based on the weak layer of the floor of 43 coal;The final slope angle of the northern is 36°,the final slope angle above the floor of 11 coal is 21°,and the slope shape is a double-fold line;the cumulative amount of 9 million and 827.6 thousand tons of coal were produced for the group coal underlying the northern slope with steep working slope and the economic benefits of the open-pit mine are remarkable.It provides reference for similar conditions of coal recycling.
作者
白润才
王东旭
王珍
BAI Runcai;WANG Dongxu;WANG Zhen(College of Mines,Liaoning Technical University,Fuxin,Liaoning 123000,China)
出处
《中国地质灾害与防治学报》
CSCD
2018年第5期142-146,共5页
The Chinese Journal of Geological Hazard and Control
基金
辽宁省教育厅科学研究基金项目(L2011051)
关键词
露天矿
陡帮开采
到界边坡
破坏模式
边坡稳定性
open-pit mine
steep slope
the ending slope
destruction mode
slope stability
