OPEN UNDERGROUND DEVELOPMENT METHOD OF MEDIUM STEEP COAL BED Russian patent published in 2011 - IPC E21C41/00 

FIELD: mining.

SUBSTANCE: method involves preliminary preparation of extraction front by construction of working platform at the projection of the section board along the spread line on the soil level of the developed bed; erection of deep bed development complex on the working platform; coal extraction by means of the above complex off the working platform by conducting parallel mine workings of rectangular section so that pillars are left; transportation of broken coal along the mine working to the working platform and its loading to the transport vehicle or stockpiling. First, the drilled bed is divided with barrier pillars into extraction blocks; each extraction block is conditionally divided into mouths of mine workings and pillars, thus locating the pillars between mouths of mine workings. Second working is started from the first mine working of the first extraction block with roof bolting; at that, some part of the complex, which is located on the soil of the performed mine working, is used as the base of anchor setting device. Then, development of the second mine working is performed in the same way; after that, pillar is removed between them; then, development of the third mine working and pillar extraction is performed between the second and the third developed mine workings, and so on to the opposite edge of extraction block. Development of extraction blocks is performed in the same order as the order of development of mine workings in the block, and width of pillar is accepted approximately equal to width of mine working.

EFFECT: increasing development efficiency of steep coal bed.

2 dwg