长壁工作面前进式开采,常常需要突然改变采区巷道布置,甚至重开工作面,也就是说,如果意外遇到阻止工作面推进的地质断层或围岩条件严重恶化,则这种情况就会发生。对于如何以最小的间断时间和最佳的经济效果迅速地重新布置好工作面,煤矿管理部门通常要考虑几个可供选择的方案并做出决策。这种决策的实施,往往对矿井生产产生多年的影响。 本文研究了这样一种情况,即各种重开工作面的方案虽然有明显的不同,但其各自的长处并无显著的差别。为此,还介绍了一种经济评价方法:即对于重开工作面的各种可能的实施方案,估算了所需要的开拓工程量、掘进效率及经济效果。同时提供了其它一些资料,以便管理部门做出决策。所以,在全面地探讨了所提出的重开工作面实施方案的各种效益之后,避免了可能出现的错误,而这样的决策是在更广泛和更可靠的资料基础上做出的。 把重点放在各种财政关系方面的问题做出评价。考虑了包括前进式、后退式、走向和仰斜开采法的所有主要方案,提出了四个可供选择的设计方案。 Forward mining of longwall face often requires a sudden change of layout of the roadway in the mining area or even reopening the working face, that is to say, if the geological fault or surrounding rock in case of accidental encounter with the working face is seriously deteriorated, will happen. Coal mining authorities often have to consider a few alternatives and make decisions about how to quickly rearrange the work surface with minimal downtime and the best economics. The implementation of such decisions often has many years of impact on mine production. This article examines the situation where there is no significant difference in the strengths of various reschedules, although there are significant differences. To this end, an economic evaluation method is also introduced: that is, for various possible implementation plans for reopening a working face, the required amount of open-up works, driving efficiency and economic effect are estimated. At the same time provide some other information for management to make decisions. Therefore, after thoroughly examining the various benefits of the proposed program to reopen the workplaces, possible mistakes can be avoided, and such decisions are made on the basis of broader and more reliable information. Evaluate issues that focus on various fiscal relations. All major programs including forward, reverse, strike and dip mining methods were considered and four alternatives were proposed.