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露井联采模式下露井边界参数的合理选取,是决定露天边坡稳定的关键因素。通过相似模拟试验对安太堡露天矿南帮4#煤和9#煤露井联合开采下露天边坡的破坏过程进行了研究,分析了边坡破坏模式以及边坡的沉降变形规律。结果表明,露井联采下安太堡南帮边坡存在3种破坏模式:1435~1450平台的沉降破坏、1390~1435平台的沉降和滑移复合破坏,并最终转为滑移破坏、1280~1390平台的滑移破坏.并指出在4#和9#煤复合开采产生的地表沉降中9#煤占总沉降量的60%以上。通过模拟得出,安太堡南帮实际边坡位置应整体后移20m,使井工开采工作面开切眼的位置由原1390台阶下移到1405台阶下,保证其开切眼所在位置至露天边坡台阶的垂直安全高度应在131m以上,该结论有效地解决了多年来困扰安太堡南帮露井联采边坡稳定性问题。
The rational selection of the parameters of open well boundary in open-pit mining mode is the key factor to determine the stability of open-air slope. Through similar simulations, the failure process of the open slope under the joint mining of 4 # coal and 9 # coal in the southern Antarctic open pit mine was studied, and the failure mode of the slope and the settlement law of the slope were analyzed. The results show that there are three kinds of failure modes in the side-slope of Antaibao south slope in the coal mining of the open pit: the settlement failure of 1435 ~ 1450 platform, the composite settlement of settlement and slippage of 1390 ~ 1435 platform and eventually the slip damage, 1280 ~ 1390 platform, and it is pointed out that 9 # coal accounts for more than 60% of the total settlement in surface subsidence caused by the combined mining of 4 # coal and 9 # coal. The simulation results show that the actual slope position of Antaibao south slope should be moved backwards by 20m as a whole, so that the position of the open face cut by the working face of mining well moves from the original 1390 steps to 1405 steps, The vertical height of the open slope should be above 131m. This conclusion effectively solves the stability problem of the side-slope of the southern gangue exposed by the Antarctic for many years.