Study on the possibility of using artificial pillar to replace the protection coal pillar of the preparation roadways during the mining process at underground coal mines in Quang Ninh region, Vietnam

Abstract

The coal reserves in protection pillar of roadways are expected to be left in the mining processin underground mines in Quangninh coal basin which is relatively large (about 16% of the total reserves).If it can be exploited, it will help to save non-renewable coal resources, reduce the cost of preparingroadway meters, extend the mine life and increase the efficiency of construction investment. In the world,in order to reduce coal loss in protection pillar of roadways, mining technology to exploit and use artificialprotection pillars are quite popular. Accordingly, in order to simultaneously exploit coal in the protectionpillar and maintain the transport roadway as a ventilation roadway for the longwall in below level, thepost-mining coal pillar will be replaced by artificial pillars formed from the stone backfill cribs, columns,metal cribs, chemical materials or low-grade concrete mortar mixes formed from fly ash, bottom ash ofthermal power plants, combined crushed waste rock and a cement additive,... This paper will evaluate thepossibility and propose a number of mining technological scheme as well as the type of constructionmaterials suitable for artificial columns.

Optymalizacja szerokości i wytrzymałości na ściskanie sztucznego filaru ochronnego w eksploatacji średniogrubych pokładów węgla w Quang Ninh z wykorzystaniem modelu numerycznego

“…The loss rate in underground mining technology in Quang Ninh coal area is currently at over 20%, mainly concentrated in coal pillars protecting the transport roadway (Cuong et al,2019). This rate is relatively high, significantly affecting the efficiency of mine construction investment and wasting non-renewable resources.…”

“…If the artificial pillar is constructed using materials with low compressive strength, the width of the pillar will need to be large, resulting in a greater amount of material to be transported, increased labor intensity, and higher construction costs. Therefore, two fundamental parameters of the artificial pillar need to be determined: (1) the width dimension of the pillar (B) and (2) the required compressive strength of the pillar (P).…”