METHOD FOR DRILLING-AND-BLASTING ROCK PREPARATION IN COAL PITS Russian patent published in 2008 - IPC E21C41/28 F42D3/04 

FIELD: mining, particularly open-cast mineral mining with the use of drilling-and-blasting works.

SUBSTANCE: method involves designing drilling-and-blasting works on the base of geological information; drilling wells in peripheral blocks and pillar blocks; charging wells with explosives and blasting thereof; cutting debris by excavation ledges. Geological information is directly obtained for each blasted block by rock dip and strike measuring in visible exposed slope area. Then said rock lithotype is determined and rock physical-and-mechanical properties of taken samples are detected. Side pattern and geological block section are created. After that angular and linear rock fracturing and fracture frequency measurements are carried out. Main fracture pattern relatively ledge slope is plotted. Technological drilling-and-blasting work parameters are calculated and drilling-and-blasting well pattern are designed from obtained geological information.

EFFECT: improved geological and information support, increased efficiency of drilling-and-blasting rock preparation in coal pits and enhanced rock excavation and conveyance capabilities.

3 cl, 3 dwg, 2 tbl