我国目前露天铁矿工作帮坡角一般在8～15°,通常称为缓工作帮。所谓陡帮就是通过改革开采工艺,提高剥岩段的工作帮坡角,一般可达20～35°左右。据统计,我国大型露天铁矿设计年产量约占全国铁矿石设计产量的90％以上,其中铁路运输的矿山产量约占66％。1980年重点铁矿山实际产量8363万吨;露天矿产量7554万吨,占重点铁矿山的90％。其中,铁路运输的矿山 At present, the work of open-pit iron mine in our country usually helps slope angle of 8 ~ 15 °, which is usually called slow work help. The so-called steep help is through the reform of mining technology, improve the work of stripping rock slope angle, generally up to 20 ~ 35 °. According to statistics, the designed annual output of large-scale open-pit iron mines accounts for more than 90% of the designed output of iron ore in the country, and the output of mines in railway transportation accounts for about 66%. In 1980, the actual output of key iron mines was 83.63 million tons; the output of open mines was 75.54 million tons, accounting for 90% of the key iron mines. Among them, the railway transport mines