Abstract:

The paper uses Flac30 software to simulate of based on the geoíogical and technica! conditions determìned width of nature coa! pillar of -300 depth roadvvay driving along next goaf in the Khe Cham coal mine. Based on the law of stress and the surrounding rock displacement of the roadway plastic zone of coal pillars proposed selection width of nature coal pillar of 14-2 coal seam -300 depth roadvvay driving along next goaf in the Khe Cham coal mine are 6m when uses bolt support, 3-^-4 m when uses the Steel type of support.