CS244597B1 - Large-surface pillar above extracted space in mountain massif - Google Patents

Description

The invention relates to a large-area pillar over a cut-out area in a mountain massif.

In the deep mining of commercial non-greasy raw materials, it is often necessary to separate large mining areas from the already extracted or grown massif of another geological structure from the safety and technological bases, an unbroken compact layer called the large-scale pillar. In a more detailed breakdown, it can be a pillar overlying, underlying, ceiling and other. Such a pillar is created by extracting a part of the deposit on the horizon, by extracting the entire horizon or by dragging the horizon, the Pillar is formed by a bearing filler and its function is permanent or time-limited. In any case, the utility mineral that creates the pillar represents a loss of bearing filler. The stress pillar is a double-sided, rectangular beam that is supported by the external forces of the mass disintegrated or by the mountain pressure of the disturbed rock. The cross-sectional shape of the pillar in view of its stress should ensure its desired stability, but it should be minimal in terms of the thickness of the bearing filler. The previously used rectangular cross section does not meet these requirements optimally.

The above-mentioned disadvantages are eliminated by a large-scale pillar above the cut-out area in the mountain massif, arranged between two intact parts of the massif. The essence of the invention is that the large-area pillar is at least on one of the surfaces facing away from the cut-out space, provided at the location of the flood-interstitial pillars with longitudinal support ribs and at the location of the flood ceiling pillars with transverse support ribs.

Claims (2)

OBJECT A large-area pillar over a cut-out area in a mountain massif, characterized in that it has the advantage of such a large-area pill shape at least on one of the surfaces diverted into the cut-out area, because the loss of utility logs is reduced because the bearing ribs of the invention ensure the bearing capacity of the pillar. In the accompanying drawing, a perspective view of an overlying pillar with supporting ribs according to the invention is shown in a vertical axial section. The supporting ribs 4, 5, of the overlying pillar in the figure, were created by incomplete disposal of the interchamber and ceiling pillars, after the extraction of a part of the horizon by a mining method, designated as an open chamber, and the indicated situation relates, for example, to the extraction of the magnesite deposit. Overlying large-area pillar 1 above the cut-out area 2 prevents the free penetration of the low-strength overburden 3 into the mining area 2. Incomplete destruction of the inter-chamber pillars produces longitudinal support ribs 4 and transverse support ribs are created by incomplete destruction of the ceiling pillars 5. The dimensions of the bearing ribs 4, 5 formed, depending on the design parameters of the mining method used - open chamber, e.g. load-bearing ribs 4 10 m, thickness 7 - 10 m, for transverse load-bearing ribs 5 is width 8 m and thickness 7 - 10 m. The increased excavation is calculated from the variations in the horizontal oblique cross-section and the resulting cross-section according to the invention. This recalculation results from the equality of the cross-sectional module of the two surfaces derived from the quadratic moments. FILL OUT at the site of the intermediate inter-chamber pillars with longitudinal support ribs (4) and cross support ribs (5) at the location of the subsoil roof pillars. 1 sheet of drawings