露天边坡对地下采场覆岩稳定性影响的数值模拟研究

以某矿山露天转房柱法地下开采为研究背景,根据现场调研获得的岩土力学参数,利用FLAC3D等软件进行三维建模1],对倾角为40°时边坡高度为90m的地下采场上覆岩层位移与应力响应特征进行数值模拟分析。研究结果表明:在露天终了边坡高度为90m倾角为40°时,地下开采完后采场上覆岩层受到开挖的扰动,稳定性降低,塑性区面积已经发育至坡面,整个岩体处于临界破坏状态,不利于矿山的安全稳定,因此建议该矿山露天终了边坡高度不超过90m。

Numerical Simulation Study on The Influence of Open Slope on The Stability of Overburden in Underground Slope

Based on the engineering background of Yunnan Jinning lake surrounding the typical slope containing soft interlayer in thick phosphate rock bed to the underground mining of room and pillar method,according to the geotechnical mechanical parameters obtained from the field investigation,software such as FLAC3D was used to conduct 3d modeling,and the displacement and stress response characteristics of the overlying strata in the underground stope with a slope height of 90m when the slope Angle is 40°were numerically simulated and analyzed.The results show that:in the open-pit end slope height of 90m inclination of 40 degrees,the underground mining after the cover rock is disturbed by excavation,poor stability,plastic area has been affected by the slope,the whole rock body is in a critical state of destruction,not conducive to the safety and stability of the mine,so it is recommended that the mine open-pit end slope height does not exceed 90m.