METHOD FOR DETERMINING VERTICAL DISPLACEMENTS AND DEFORMATIONS Russian patent published in 2013 - IPC E21C39/00 

FIELD: mining.

SUBSTANCE: method involves laying of the main profile lines located along and across the spread of coal bed or ore deposit, and additional profile lines located in other directions within the boundary limits of displacement basin, which are fixed at equal intervals with working and reference marks located on ends of profile lines outside the displacement zone, regular determinations of high-altitude position of working marks relative to reference marks before the beginning and during displacements of ground surface, obtainment of settlements, calculation of inclinations and curvature both as the first and the second derivatives of settlements accordingly. Before the beginning of surface displacements there put are at least four reference marks outside the displacement zone, two of which are located in maximum settlement line along the spread of bed or ore deposit and two others - perpendicular to the line of the two first ones, i.e. across the spread of bed or ore deposit; laser scanning survey of potential underworking zone is performed before the beginning of displacements, and repeated surveys of the same section are performed after the beginning of displacements, thus setting external orientation marks on reference marks during each survey. As per the surveying results of laser scanning system there built are three-dimensional point models of ground surface underworking section, by means of use of which there obtained are settlements, as difference of the corresponding profiles of point model reflecting the state of the section surface before the beginning of displacements and profiles of the model reflecting the state of the same section for a certain stage of displacement process, including displacement process completion stage. At that, compared profiles are obtained as intersection lines of surfaces of models, which reflect different stages of displacement process, with vertical planes, the unambiguous position of which is determined through coordinate references to external orientation marks displayed on three-dimensional point models.

EFFECT: improving accurate determination of settlements free from orientation errors of digital models and obtaining vertical displacements and deformations at any point of mine rock displacement basin, including breakdown zone.

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