哈尔乌素露天煤矿南端帮边坡角度优化

露天煤矿边坡是构成采矿场形状的重要要素，合适的边坡角度对维持露天煤矿边坡稳定和经济效益具有重要意义。以哈尔乌素露天煤矿南端帮边坡为例，分别采用数值有限元法和Fellenius、Bishop、Janbu等3种极限平衡法相结合的方法，分析了哈尔乌素南端帮边坡在37°现有的条件下端帮边坡最小稳定系数为1.341，潜在圆弧滑动面贯穿整个坡体，南端帮边坡处于稳定状态且有进一步提高的可能。充分结合目前南端帮平台构成特征并考虑端帮运输系统的情况下，提出4种提高端帮边坡角度方案，并采用有限元法和Janbu极限平衡法对4种可行方案进行对比和稳定性分析。结果表明：边坡角度可以提高至40°，最低稳定系数能达到1.135，可增加原煤产量近43.8万t，增加岩石剥离量18.15万m³，可提高经济效益7 382万元。

Optimization of the South End-slope Angle of Haerwusu Surface Coal Mine

The end-slope is the significant factor of composing the open coal pit，and the reasonable end-slope angle has a great significance on maintaining slope stability and economic benefit.Taking the south end-slope of Haerwusu open coal pit as a case，the numerical finite element method and three ultimate equilibrium methods of Fellenius，Bishop，Janbu were adopted separately to obtain the minimum stability coefficient to be 1.341 on the basis of the slope angle at 37°.There is a potential circular slip surface throughout the entire south end-slope.Its stability is in steady state and has the potential to improve.Based on considering the south end-slope constitutive characteristic and haulage system arrangement，four schemes of improving south end-slope degree were proposed.Numerical finite element method and ultimate equilibrium method of Janbu theory were adopted to analyze slope stability of four feasible programs，the results showed that the slope angle was increased to 40°，and the minimum stability coefficient reached 1.135.By this method，more than 438 thousand ton of coal resources and 181.5 thousand m³ of rock stripping volume were increased，which brings economic benefit of more than 73 820 thousand yuan.