基于FLAC^(3D)的深部大规模开采围岩稳定性分析

Stability Analysis of Surrounding Rock Under Deep and Large-scale Mining Based on FLAC^(3D)

以马城铁矿-900^-720 m阶段V矿体开采为研究对象,采用FLAC^(3D)数值模拟软件对其充填开采过程进行模拟研究得出:开挖后矿房肩角及顶板中间处出现应力集中现象,且随着相邻矿房开采,矿房顶板、上盘围岩、矿柱位置出现不同程度的以拉伸为主的破坏现象,塑性区呈不断增大的趋势;通过尾砂胶结充填,矿房围岩应力重新分配,原有矿房顶底板、两帮及矿柱集中应力减小,受力呈均匀分布趋势发展,顶板沉降和底板底鼓受到抑制,塑性区破坏减小,尤其是充填体周围的塑性区没有增大,说明充填体抑制了塑性区的发展,充填对采空区围岩变形控制效果显著。

Taking the mining of V ore body in the stage of --900^- 720 m in Macheng iron mine as the research object, the filling process was simulated by numerical simulation software FLAC3D. The results were concluded as follows. After the exca- vation, the stress concentration occurred in the shoulder angle of the chamber and the middle of the roof. And with the mining of adjacent chambers, the roof, the hanging wall rocks and the pillars presented varying degrees of damages, mainly shown as tensile damage, and the plastic zone showed an constantly increasing trend. After cemented tailings filling, the stress of the surrounding rock was redistributed. The stress concentration of the original roof and floor, the two sides and the pillar was re- duced, and the stress distribution was almost evenly distributed. Moreover, the settlement of the roof and the floor heave were restrained, and the plastic zone damage was reduced, especially the plastic zone around the filling body did not increase at all, which indicated that the filling body inhibited the development of plastic zone and the filling had a significant effect on the de- formation control of the surrounding rock.