摘要
针对霍林河北矿一采区东北帮压煤的安全回采问题,借助FLAC3D,基于强度折减理论,模拟研究了不同空间形态条件下的边坡稳定性,揭示了开挖位置、开挖角度和追踪距离对顺倾软岩边坡空间破坏模式与稳定性的影响.研究结果表明:东北帮边坡沿21煤底板弱层发生以椭球面为侧界面的切层-顺层滑动;横采内排可以安全有效地回采东北帮压煤;在横采条件下,减小追踪距离对控制边坡稳定具有重要的意义,边坡的稳定系数随着追踪距离长度的增大呈负指数规律减小;能够满足边坡安全要求的东北帮横采开采位置为留设岩柱50 m,开挖角度70°,追踪距离不应超过100 m.
Aiming at the problems of mining safety along northeast side of Huolinhe North Mine, this paper simulated the slope stability under different spatial conditions, and revealed the influence of excavation position, excavation angle and tracking distance on the spatial failure mode and stability of soft rock slope based on strength reduction principle. The FLAC3 D was utilized in this study. Result shows that the slope landslide model of the east slope is the tangent plane sliding along the ellipsoidal surface as the weak layer of the 21 coal seam; cross exploitation and inner dumping can safely and effectively withdraw the northeast coal seam; under the condition of cross exploitation and inner dumping, decreasing racking distance is very important for slope stability. The stability coefficient of the slope decreases exponentially with the increase of the length of the track length; scheme is finalized that excavation position is by the way of setting rock of 50 m, excavation angle of 70 degrees, and track distance should not exceed 100 m.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2018年第2期232-237,共6页
Journal of Liaoning Technical University (Natural Science)
基金
国家自然科学基金(51104084
51474119)
国家自然科学基金重点资助项目(U1361211)
辽宁省煤炭资源安全开采与洁净利用工程研究中心开放基金(LNTU15KF08)
关键词
顺倾边坡
露天矿
边坡稳定性
追踪距离
三维效应
dip bedded slope
open pit
stability of slope
tracking distance
three-dimensional effect
