Shanxi Coal Import and Export Group Hequ Jiuxian Opencast Coal Industry Co. , Ltd.
College of Energy Engineering, Xi’an University of Science and Technology

针对河曲露天矿首采区向二采区转向的问题,对比了重新拉沟、缓帮留沟和扇形转向三种接续方式的优缺点,确定采用缓帮留沟方式。综合考虑二采区开采程序要求及留沟对内排运输系统、原煤运输系统、运距变化等影响,揭示了内排方式对剥采系统的影响规律,计算了不同开采方式的二次剥离和运输成本,构建了总费用模型。通过技术经济比较得出全压帮内排剥离物料对运输距离较小,同时内排空间能够完全释放,但会导致二采区开采过程中与首采区接触的西端帮大量的二次剥离量,而全留沟内排开采二次剥离量较少,但是由于留沟的影响,使得内排空间无法完全释放,增加了剥离物料的转排费用,同时外排剥离物料需要征地,整体开采费用较高。综合对比两种开采方式,推荐采用全留沟内排。

In order to solve the problem of the transition from the first mining area to the second mining area in Hequ Open-pit Coal Mine, three transition modes are proposed, namely, re-trenching, retaining trench with gentle slope and sector turning. Based on the current mining situation of the mine, advantages and disadvantages of the three schemes are compared and analyzed, and the transition mode of retaining trench with gentle slope is finally determined. Based on the comprehensive benefits of the two mining methods, and on the basis of comprehensively considering the requirements of the mining procedure in the second mining area of the mine and the impact of ditch retention on the internal drainage transportation system, raw coal transportation system, and the change of transportation distance, this paper reveals the comprehensive impact law of various ways of end-wall fully covered and full retention ditch with inner dumping on the stripping system. The secondary stripping and transportation costs with different mining methods are calculated, and the total cost model is constructed. Through technical and economic comparison, it's concluded that the transportation distance of stripped materials discharged inside the end-wall fully covered is small, and the inner drainage space can be completely released. Besides, it will lead to a large amount of secondary stripping of the western end wall that contacts the first mining area during the mining process of the second mining area. While the secondary stripping amount of the full retention ditch mining is small, but due to the influence of the ditch, the inner dump space cannot be completely released, the transfer cost of stripped materials is increased. Meanwhile, large area of land needs to be expropriated to discharge stripped material. According to comprehensive comparison of the two mining methods, the full retention ditch mining is recommended.

张 宇, 马 宁, 吕贵龙, 等. 河曲露天煤矿首采区末期全留沟内排方案 [J]. 煤炭工程, 2023, 55(12): 121-127.