| 摘要 |
FIELD: mining. ^ SUBSTANCE: recovery method of mined-out pits involves filling of the worked-out area to the boundary of upper level of ground waters with construction waste close as to its composition to natural minerals, laying of drainage layer of construction waste with thickness of not less than 0.6 metre and with fraction size of 150-200 mm. At that, first, planning is performed and cuts of deposits of average coal age are determined. Filling with construction waste is performed while those cuts of deposits of average coal age are kept free, and access is provided to them in order to monitor them and to arrange the museum of the Earth. Then, in the centre of the pit, on the drainage layer there laid are overburden rocks; at that, a hill is formed; after that, when the hill height reaches average absolute level, terracing of hill slopes is performed by means of a bulldozer; and section is pre-broken and furrows indicating the boundaries of the future terraces, tracks and access ways are ploughed. Bed of each terrace is formed with reverse cross slope to two gradients; at that, width of terrace bed is not less than seven metres. For each terrace, starting from lower tier of terraces, along the whole perimetre of the pit, there built are embankment plate or stone walls and they are bound with cement mortar. Drainage system is routed and burial places are built on terraces. ^ EFFECT: reducing labour costs of recovery work owing to excluding the necessity of extraction of large volumes of soil for creation of fertile layer. ^ 1 dwg |
