抚顺东露天矿露井联采下边坡变形机理研究

Study on deformation mechanism of slope under combined open-pit and underground mining in Fushun East Open-pit Mine

抚顺东露天矿在空间上与其下部的老虎台矿和老龙凤矿在平面上存在重叠,在标高上区分,在时间上存在露井联采时期。在野外调查的基础上,通过数值模拟,分析露井联采作用下边坡的变形、受力特征;总结了E8800、E5400南北帮的变形特征;分析了E8800、E5400 2个剖面南帮的稳定性。结果表明:现阶段边坡岩体和地下岩体塑性区基本由井采造成,露采作用下仅在南、北帮局部形成小范围的拉张塑性区;现阶段2个剖面北帮的坡度均不超过10°,但北帮塑性区均十分发育,在露采持续进行的情况下,应重点关注北帮的稳定性情况。

Fushun East Open-pit Mine overlaps with its lower Laohutai Mine and Laolongfeng Mine in space, and is distinguished in elevation, and there is a period of combined open-pit and underground mining in time. On the basis of field investigation,through numerical simulation, the deformation and stress characteristics of the slope under the combined open-pit and underground mining are analyzed. The deformation characteristics of the E8800 and E5400 southern and northern sides are summarized, and the stability of the southern part of the two profiles has been studied. The results show that the plastic zone of the slope rock mass and underground rock mass is basically caused by underground mining at this stage, and only a small area of tensile plastic zone is formed in the southern and northern gangs under the action of open mining. At this stage, the slope of the northern part of the two profiles is not more than 10 degrees, but the plastic zone of the northern part is very developed. In the case of continuous open mining, the stability of the northern part should be paid attention to.