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为解决露天煤矿采区转向时的合理边坡工程位置、超前降深水平及合理边坡形态问题.结合准东露天煤矿首采区提前转向工程实例,运用刚体极限平衡法及数值模拟,探讨边坡降深水平与合理边坡角的关系,提出超前降深水平位置,并分析了边坡的破坏形式及其塑性贯通区形状,为确定转向境界,提前实现横采内排提供有力依据.结果表明:边坡降深到286水平后合理边坡角变化不大.建议西帮北部边坡超前降深到350水平处.边坡岩体的破坏方式为张拉-剪切复合型破坏,边坡开挖后在坡脚形成的应力集中造成的局部岩体破坏是滑坡发生的诱因.
In order to solve the problems such as the location of reasonable side slope, the level of advanced settlement and the reasonable slope shape when the mining area turned in the opencast coal mine, combined with the case study of the first mining area in Zhungeng open-pit mine, the rigid body limit equilibrium method and numerical simulation The relationship between the level of slope reduction and the reasonable slope angle is proposed, the advanced horizontal position is proposed, and the failure form of the slope and the shape of its plastic penetration zone are analyzed, providing a strong basis for determining the steering realm and realizing the horizontal mining in advance. The results show that the reasonable slope angle does not change much after the slope is deepened to 286. It is suggested that the north slope should be advanced to the level of 350. The failure mode of the slope rock mass is the tension-shear composite failure Local rock mass damage caused by stress concentration at the slope foot after slope excavation is the cause of landslide occurrence.