METHOD FOR EVALUATION OF QUALITY OF CEMENTATION OF ROCK MASS Russian patent published in 1995 - IPC

FIELD: ore mining industry. SUBSTANCE: method for evaluation of quality of cementation of rock mass includes drilling holes, determination of intervals of distribution of fissured hollowness of rock mass by measuring rock electrical resistance in holes, measurement of depth of rock jointing zone, and determination of total volume of hollowness in controlled volume of fissured rock mass before and after consolidation by summing up interval hollowness volumes on the basis of measurement results of fissured hollowness. Cementation quality is evaluated by relation of these total hollowness volumes. Controlled volume of rock mass, for one hole, is taken as volume of cylinder with height equal to depth of jointing zone, and with radius equalling the depth of current penetration into rock mass, and, for working district, as volume of sector of hollow cylinder with height confined between boundaries of controlled volume along working length with inner radius equalling working radius and with outer radius equalling sum of working depth and depth of jointing zone, and with central angle formed by external boundaries of controlled volume in working cross-section. EFFECT: higher efficiency. 2 dwg