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建国以来,我国露天矿的设计与生产,基本上沿用缓工作帮的开采工艺,即大部份都采用了在矿体上下盘附近或运输出入沟处,沿矿体走向首先开沟,形成每个台阶都有运输平台,用独立的采掘和运输设备进行采剥。电铲工作面沿矿体走向布置,采掘带一般也沿矿体走向布置,一直采到每个台阶的最终境界为止。由于其工作平台较宽,各工作平台依次排列成阶梯状,故工作帮坡角相当缓。铁道运输时,工作帮坡角一般为8～12°;汽车运输时,也只能达到12～18°。因此,它简称为缓帮开采。实践表明,这种以缓工作帮坡角为特征的缓帮开采工艺的基建工程量大、投资多、投产和达产年眼长、新水平准备时间长、初期生产剥采比大、最终边
Since the founding of the People’s Republic of China, the design and production of the open-pit mines in our country have basically followed the mining techniques of slow work to help, that is, most of them have been used for ore ditches near the upper and lower ore mines or for transportation and ditching. A platform has a transport platform, with independent mining and transportation equipment for mining stripping. Electric shovel face along the ore body layout, mining belt is generally along the ore body layout, has been taken to the final state of each step so far. Due to its wide working platform, the work platforms in turn arranged in a ladder-like shape, so work slope angle is quite slow. Railway transportation, work slope angle is generally 8 ~ 12 °; car transport, it can only reach 12 ~ 18 °. Therefore, it is abbreviated as slow-recovery mining. The practice shows that this kind of slow-relief mining process characterized by gentle working of slope helps large-scale construction projects with more investment, long-term production and annual production, long preparation time for new levels, large initial stripping ratio and final edge