摘要
弓长岭铁矿上下含铁带开采间隔仅有10 m,回采顺序为先开采上铁带后充填,再进行下铁带开采,由于矿体间隔较近,若下铁带采场暴露面积过大,将对上铁带稳定性产生影响,造成中间隔离岩柱与上铁带充填体垮塌的风险。根据矿床开采技术条件与设计采场结构参数,采用有限差分程序模拟分析了弓长岭铁矿上下铁带开采稳定性。研究结果表明,不充填开采时,上下铁带隔离岩柱产生的塑性区贯通,且拉应力接近1 MPa;上铁带采空区及时充填后,塑性区不发生贯通,拉应力较小,岩柱及采场可维持稳定。
The upper and lower iron ore layers in Gongchangling Iron Mine are apart only by 10 m.The upper ore layer is first extracted and backfilled before the lower layer is mined.Due to the short upright interval,a large mined out area in the lower layer may affect the ground stability of the upper layer,posing a risk of falling interval rock pillars and backfilled material in the upper layer.A study was therefore conducted based on the mining design and the stope structural parameters,through the finite difference method.The study shows that when the upper layer is mined without backfilling,connections will form in the plastic zones of the interval rock pillars between the upper and lower layers,with tensile stress approximating 1 MPa;when the mined areas of the upper layer are timely backfilled,however,no connections form in the plastic zones,with rather low tensile stress,and both the rock pillars and the stopes can remain stable.
作者
田迎春
范文录
马东
谢盛青
宫国慧
陈小伟
李宗武
王怀勇
胡世超
傅利民
TIAN Yingchun;FAN Wenlu;MA Dong;XIE Shengqing;GONG Guohui;CHEN Xiaowei;LI Zongwu;WANG Huaiyong;HU Shichao;FU Limin
出处
《中国矿山工程》
2021年第3期23-26,共4页
China Mine Engineering
关键词
稳定性
隔离岩柱
垮塌
充填
stability
interval rocks
collapse
backfilling
