Closure of Fracture Due to Cover Stress Re-establishment After Coal Mining

摘要: In situ measurements of deformations, stresses, and closure fractures, affecting water inflow following coal mining, are challenging due to the inaccessibility fractured rock. this paper, authors studied process rock mass with cover stress re-establishment based on a theoretical analysis scale model testing. A quantitative is used study fracture distribution in zone. function describe aperture zone proposed, which takes into account curvature thickness The testing both indicate that mining distance increasing relationship between satisfy logarithmic function. test also shows features: (1) ratio (which area divided by total intact unit width vertical or horizontal direction) lower part greater than upper part; (2) initially fast decreased ratios then followed slower decrease during process; (3) mass, directional fractures small apertures being closed re-establishment, indicates an increase resistance reducing seepage from these parts This improves general understanding after ceased, provides basis for resource protection case underground mining.