METHOD FOR INCREASING STABILITY OF QUARRY BORDER LEDGES Russian patent published in 2004 - IPC

FIELD: mining industry.

SUBSTANCE: method includes geophysical measurements, analysis of massive geological construction by means of drilling wells with description of kern, construction of geological cross-sections, detection of potential sliding surfaces, determining physical and mathematical properties of rock solids massive and estimation of hydrogeological, mountain technology factors, calculation of height and angle of ledge slant for selected coefficient of stability resource. Foremost well is drilled in the process and physical-mechanical properties of rock solids at massive portion with supposed most unfavorable conditions in accordance to geological data, starting value of depth of location of potential sliding surface h₀ is measured, likely specific electric resistances ρ_k are measured by method of electro-profiling on surface of projected ledge with probing depth equal to h₀, in parallel to its brow, change of location depth of potential slide surface is determined within ledge limits in accordance to formula. Value of stability resource coefficient η is calculated on basis of relation of displacing and holding forces, for cross-sections perpendicular to profile, with different x coordinates, using data for foremost well about physical-mechanical properties of rock solids and geological cross-section with consideration of change of location of sliding surface relatively to ledge limits in accordance to change of h, and analysis of geological composition of massive, calculation of height and angle of ledge slant is performed for least stable cross-section with minimum value η.

EFFECT: lower laboriousness of determining of position of potential sliding surfaces at most dangerous portions of massive, higher precision of determining of technological parameters of ledges, higher stability of these.

3 cl, 4 dwg, 1 ex, 1 tbl