School of Civil Engineering,North China University of Technology

为明确露天矿延深开采对采空区、高陡边坡及地表的影响,以老虎台矿采区为研究背景,利用MIDASGTS-NX软件对老虎台矿E5800剖面继续延深开采诱发的边坡变形破坏范围进行了数值模型分析;揭示了露天矿延深开采诱发边坡滑移的机制。研究结果表明,随着露天开采的延深,边坡地表最大水平位移与最大沉降的位置变化逐渐减小,第四次与第一次开采最大下沉点位置对比,向北移动了13m,下沉值增大了57.5%,且露天临空面的增大和侧向约束减小,使边坡岩体应力逐渐向坑内移动,说明地下采区开采受露天矿开采诱发的活化影响对边坡的稳定性影响逐渐增大。考虑到开采过程中会有爆破因素的影响,选取最危险的剖面N900对其进行边坡稳定性评价,并针对可能产生的危险情况,提出建立相应的监测手段。

In order to clarify the influence of extended deep mining of surface mine on goaf,high and steep slope and surface,the mining area of Laohutai Mine was taken as the background. By using MIDAS GTS - NX software, the slope deformation and failure range induced by continuous extended deep mining of E5800 section in Laohutai Mine was analyzed by numerical model. The mechanism of slope slip induced by extended deep mining of surface mine was revealed. The results show that with the deepening of open-pit mining,the position changes of maximum horizontal displacement and maximum settlement on the surface of slope gradually decrease. Compared with the position of the maximum subsidence point of the first mining,the fourth mining moved m to the north,and the subsidence value increases by 57. 5%. Moreover,with the increase of the open pit and the decrease of lateral constraint,the stress of the rock mass of the slope gradually moves to the pit,which indicates that the influence of the activation induced by the mining of surface mine in the underground mining area on the stability of the slope gradually increases. Considering the influence of blasting factor in the mining process, the most dangerous section N900 is selected to evaluate the slope stability,and the corresponding monitoring means are put forward in view of the possible dangerous situation.

中国煤炭科工集团双创资金重点项目(2022-ZD002);国家自然科学基金项目(41772335)

孙世国,于磊,于云鹤.露天矿延深开采诱发边坡地表变形研究[J].矿业安全与环保,2025,52(1):122-128.

SUN Shiguo,YU Lei,YU Yunhe. Study on surface deformation of slope induced by extended deep mining in surface mine[J]. Mining Safety & Environmental Protection,2025,52(1):122-128.