METHOD OF PROTECTIVE PILLAR CONSTRUCTION

FIELD: mining. ^ SUBSTANCE: invention concerns mining and can be applied in protection of surface and/or underground objects against undermining. The method involves defining the border 4 of the protected zone (PZ) 5 of object 2 in the form of geometrical position of the points located at distance equal to the width b of safety berm from outline 3 of object 2 and at distance of ri and rj along the given radius-vectors and from the central point O fixed within the border 4. The radius-vectors cross vertical axis (VA) passing through the given central point O. Then a side surface (SS) of the protected zone (PZ) 8 is formed by generating lines (GL) 9 oriented along the mentioned radius-vectors and and drawn from the border 4 under the displacement angles of alluvium (AS) 10 and parent rock (PRS) 13 solids, defined for each direction of and . Further from a crossing line of the SS with roof (RS) 13 and ground (GS) 15 surfaces of a mineral deposit (MD) 6 borders 16 and 17 of the protection pillar (PP) are defined against the mentioned RS and GS in the form of a geometrical position of the points located at distances and along and directions from the VA to the border 16 and at distances and to the border 17, while the values of these distances are defined by the functional dependencies with account to displacement angles of AS and PRS, dip angles MD RS and GS and the ground surface of AS, distances ri and rj from the VA to the border 4 at the respective directions, depth of MD RS and GS occurrence, alluvium thickness under the PZ and VA plane, height marks difference at the PZ base (or day surface) in the central point O on the VA and on points i and j where respective radius-vectors and cross border 3. Functional dependencies are defined according to the geometrical constructions and have the one form for PP area 1 at the downslope of the MD 6 strike line (SL) 7 crossing VA, and another form for the upslope area of SL 7. ^ EFFECT: ensuring sufficient safety of an object protected against undermining in any direction. ^ 4 dwg, 2 ex, 1 tbl