PROCEDURE FOR ANGULAR CHARACTERISATION OF STRATA AND EARTH SURFACE MOVEMENT PROCESS AT UNDERGROUND MINING OF ORE DEPOSITS Russian patent published in 2010 - IPC E21C41/22 

FIELD: mining.

SUBSTANCE: invention refers to metal mining industry and can be implemented for protection of objects on surface from adverse effects of underground mining works. Preliminary mining and geological conditions of deposit bedding and developing are analysed. The analysis characterises embedding of mining H/L, where H is depth of rock, m, L is span of mined space, m, and a weighted average value of coefficient of rock rigidity f_aver. There is evaluated coefficient of structure loosening k varying within ranges from 1 to 0.4 depending on stratification and dislocation of massif. Further, complex indicator of structure and competence of undermined massif n=kf_aver is calculated. Basic angle of movement δ is determined from nomogram applying obtained values of mining and geological factors, while angles of movements β and γ are calculated with consideration of deep angle of deposit α from formulas: β= δ - α cosⁿ α, γ = δ + α cosⁿ α.

EFFECT: reduced economic, labour and time expenditures at complete safety of operations, also increased accuracy of correspondence of angular parametres to changed mining and geological conditions at developing deeper horizons of deposit.

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