| 摘要 |
FIELD: mining.SUBSTANCE: method, according to which quarry boards are shaped with slant angles equal to slant angles of working boards, and the quarry is expanded until the current stripping ratio reaches the value of the border stripping ratio. Points of the upper quarry contour are fixed in the final position, then, using the available position of the upper borders, the final depth is found, giving maximum possible value to slant angles of boards at the moment of completion of open works. At the moment of equality between the current stripping ratio and the border one, the slant angle of the working board is increased, provided that the current stripping ratio is equal to the border one.EFFECT: expansion of quarry borders, development of more even mode of mining works.1 ex, 2 dwg |
