端帮压帮的陡边坡开采技术分析

以安太堡露天矿端帮为研究对象,运用极限平衡法、FLAC~(3D)数值模拟法,结合岩石力学参数,对端帮压帮前和压帮后的边坡稳定性和滑坡模式进行了深入分析,得出:减缓边坡角和内排压帮是提高边坡稳定性的2种有效措施;边坡压帮前,边坡稳定系数与边坡角近似呈反比关系,压帮前南帮NB1402剖面的稳定边坡角为29°;压帮后的滑坡模式为圆弧滑动,不受内排土场约束的浅部岩体位移明显,边坡稳定系数与压帮高度近似呈正比关系,且压帮至4个台阶水平时满足安全要求;压帮前后的垂直与水平应力均随着埋深的增加近线性增大,内排压帮可缓解边坡坡脚处的应力集中现象,进而提高边坡稳定性。

Analysis on the Mining Technology of Steep Slope under the Burying Slope of the End Slope

Taking Antaipu open-pit coal mine as the abject of study,the open-pit coal mine's end slope stability and landslide model before and after burying slope are profoundly analyzed,by using the limit equilibrium method and FLAC3D numerical simulation method,and combined with the rock mechanics parameters.The conclusions are drawn as follows:Slowing down slope angle and inner-dumping with burying slope are two kinds of effective measures to improve the slope stability;With the increase of slope angle,it has an approximate inverse proportional relationship with the slope stability coefficient before the burying slope;The stable slope angle of the NB1402 profile in the south slope is 29° before the burying slope;The landslide model after the burying slope is circular sliding model the displacement of the shallow rock mass change obviously;With the increase of the height of the burying slope,the burying slope and the slope stability coefficient are approximate to be positively proportional relationship;In order to control the overall and local stability of the slope,the engineering geological profile meets safety requirements on burying slope to four steps.The vertical stress and the horizontal stress of the slope increase linearly nearly with the increase of the height of the burying slope;Inner-dumping with burying slope in the mining area are conducive to release stress concentration phenomenon in the slope foot and to increase the slope stability.