抚顺西露天矿南帮边坡破坏机理及内排压脚措施

Failure Mechanism and Internal Dumping Control Measures of South Slope in Fushun West Open-Pit Coal Mine

为了研究抚顺西露天矿南帮边坡的破坏机理,抑制边坡的滑移变形,应用微震监测技术和卫星监测技术,研究了南帮边坡的滑移破坏轮廓,基于RFPA(rock failure process analysis)强度折减法原理,研究了开采到最终境界时的边坡破坏机理,提出了两阶段内排压脚的防治措施,并分析了内排压脚对滑坡变形的抑制效果。研究结果表明:1)边坡破坏机理为,破坏最先发生在边坡上部,在边坡中部沿着弱层和破碎带运动,到边坡下部不整合面处受到抑制,最后在边坡底部沿中间弱层切出坑底,形成滑坡轮廓;2)两阶段内排压脚方案能明显抑制弱层的错动,当内排到-262m水平时,可部分抑制底部弱层处滑移,底鼓现象消失;当内排到-212m水平时,可完全抑制住底部弱层的滑动,此时边坡安全系数为1.324,满足安全要求。

To research the failure mechanism of the south slope of Fushun West open-pit mine and restrain the deformation and damage,the slipping profile of the South slope was studied by using microseismic monitoring technology and satellite monitoring technology.The failure mechanism of slope at the final state of mining was studied and the two-stage internal dumping control measure was put forward and analyzed based on the principle of RFPA strength reduction method.The results show:1)The failure mechanism of South slope is that the damage occurred first in the upper part of the slope,then moved along the weak layer to the middle of the slope,and then was restrained by the surface of unconformity in the lower part of the slope,and finally cut out the bottom of the pit along the middle of the weak layer.2)The two-stage internal dumping foot-pressing scheme control measure can significantly restrain the movement of weak layer.When the dumping stacked to-262 mlevel,the movement of weak layer was partially restrained,and the phenomenon of bottom bulging was disappeared;when the dumping stacked to-212 mlevel,the movement of weak layer was completely restrained,at that moment the slope safety factor was 1.324,which meets the safety requirements.