INDUNCED STRESS DETERMINATION AND THE RISK ASSESSSMENT OF ROOF COLLAPSE IN ROOM AND PILLAR UNDERGROUND COAL MINING METHOD

Abstract

Coal mining operations are performed continously to supplyenergy resources. Up to now, surface coal mining system is prefered because it is easier and lower cost than underground coal mining system. It will be uneconomic after reach the certain depth. In consequence of that fact, underground mining system will be needed for mining the deeper coal reserves absolutely.

Room and pillar method has being appliedwidely. In this method, roof fall were occurred
when coal pillar unable toprovide support the stress due to the load of overlying strata.
Therefore, the estimation of induced stress effected by underground coal mine openings
and the assesment of roof fall risk are very important in order to ovoid injuries on miners,
equipment breakdowns, stoppages in mining operations, and inefficient recovery of coal
reserves.

This paper shows literature study toward recently researchs about induced stress and
roof fall risk in underground coal mining. Underground miners, especially rock mechanic
engineers, can figure out of the challenges and opportunities in strive for room and pillar
underground  coal  mining  stability  by  studyingof methodology  and  result of  these
researhs.