SU1219806A1 - Method of mining thick gently-sloping ore deposits - Google Patents

Description

The invention relates to the mining industry and can be used in the underground mining of powerful flat ore deposits with the laying of the goaf.

The purpose of the invention is to increase the safety of the development by stabilizing the stresses in the mined ore massifs and reducing the cost of backfilling.

FIG. 1 shows a general scheme of the development of work (plan); in fig. 2 is a section A-A in FIG. one; in fig. 3 is a section BB in FIG. one; in fig. 4 shows a section B-B in FIG. one; in fig. 5 - graphs of stress concentration curves in front of an intact array under the influence of a cleaning pit; in fig. 6 is a diagram of the formation of a transport and haul making in a backfill array.

At the same time, the marginal part of the untouched array of ore ahead of front 1 of the grooves in the panel, panel drifts 2, temporary panel pillars 3, leading vertical strip 4, adjacent strip 5, flanking layers 6 along the panel borders, connecting 7 similar layers of the adjacent strip, paired isolated pillars 8, transport and haul openings 9, worked out space of 10 chambers, cementless (hydraulic) tab 11, blanked panel pillar 12, tab 13 of the workings of the upper hooking, system 14 external hydrostatic pressure No, stress concentration curve 15 with the underworking span width fi, stress concentration curves 16 and 17 during span 2 under the conditions of limiting deformations of compression of the bookmark and without limitation, respectively, ore fines 18, preparatory (brown) production 19, working out 20 layered races metal enclosing grid 21, previously laid hardening array 22, stress concentration factor K; depth H of the bed of the ore body, width L of the deposit along the front of the excavation, volume weight y (density) of the overlying strata, hydrostatic pressure Pg in the pores of the uncemented bookmark. Roman numerals I-V indicate the stages of the formation of transport workings in the stowing mass of the adjacent lane.

The method is carried out as follows.

In the case of a block-block scheme for the preparation of a deposit, mining of the deposit is carried out from its center to the periphery by two diverging fronts 1 with preliminary work on the roof of the ore body and erection of an artificial roof in the workings. As the underworking span develops, the condition of the overburden, ore and backfill massifs is monitored and after fixation of the moment of the overburden of the overburden and the associated

By redistributing the forces of rock pressure on span 1, further processing of the massif is carried out as follows.

The next excavation strip 4 is arranged in parallel and in front of the notch front at a distance exceeding the zone 15 of the stress concentration peak, forming the frontal plane of the cut-off of the ore mass in the zone where the stress concentration is still

did not reach dangerous values. Then, with a lag of 2-3 layers, the adjacent lane 5 is worked, having one flank extending it to the previously laid array 22, and the opposite flank diagonally

inlet to the leading strip 4. Testing of the adjacent strip 5 can be conducted in opposite directions to half the width of the panel, with troughs 7 of the same height in layer at an obtuse angle. Simultaneously with the breaking of the layers of the adjacent strip 5

along the lateral borders of the panel, from the flanks of the cut-off array, which are opposite on the diagonal, there are layered tabs 6 in the direction to the backfill arrays 22 and 4, forming flanking cut-off planes, which are joined at an angle with the frontal one. The space of the layer assemblies 7 along the height of the adjacent strip 5 is filled with ore fines before laying. In the process of working out the lower layer of the adjacent strip from its adjoining side to the backfill arrays 22 and 4

volumes of space are allocated with sizes equal to the size of transport and haul openings 9, in which bulk ore fines 18 are formed, covered with a reinforcing mesh from the future exposure, waterproofed and overlaid with a hardening mixture. After completion of the excavation and laying of the adjacent strip 5 and layer 6, paired pillars 8 are obtained, isolated in all planes from the ore massif. Before blasting, the ore in the pillars 8 using the loading and delivery equipment removes the ore fines left in the first layer of the adjacent strip 5 and in the plane of the junction 7, thereby forming transport and haul mines 9 and the initial compensation space

(cutting gap) for borehole charge blasting in a chamber circuit with two diverging ends. At the same time, work on the formation of workings 9 and the cutting gap is combined with the formation of preparatory (drilling) workings 19 in pillars of pillars 8. Ore output as bore holes in pillars 8 are made on their opposite flanks, which ensures the independence of cargo flows and increases the occupancy of machine equipment and in general, increases the intensity of working out the pillars.

After shipment and stripping of chambers (for example, using remotely controlled equipment), their space 10 is filled with a cementless (hydraulic) tab 11.

With the further development of the total span of the ore excavation in panels 1 to a width of 12, two or more times higher, the originally marked lowering or loading step, their thickness Ei, respectively, gradually creates pressure of excess water in the pores of the uncemented bookmark 11 by connecting internal volumes of spaces contoured

hardening arrays of strips 22, 4 and 6, to the external hydrostatic pressure of the liquid column in the system of wells and pipelines 14 and maintain it to values not exceeding the water filtration threshold in the arrays of hardening bookmarks bordering the cleaning space, which stabilizes the deflection and stress concentration in overlapping rocks.

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Claims (1)

METHOD FOR DEVELOPING POWERFUL FLATING OIL DEPOSITS, including ventilating and transporting workings, drilling and blasting of ore with vertical external and internal paired strips, formation of temporary pillars and their excavation, ore mining in vertical strips in layers from the bottom up with a stepped arrangement of faces; the worked out space of the blocks with the preservation of the transport and delivery workings in the filling mass of the lower layer and the release of ore through these workings, characterized in that, in order to increase the safety of mining by stabilizing the stresses in the processed ore masses and reduce the cost of laying work, the blocks are cut off by the leading recess of the outer strip, the inner strip is worked out by two faces at the same time from the diagonals of the block diagonally, while the faces are on short sides block lead along its border to the stowage array of the outer strip, faces along the long sides of the block lead parallel to one another in the middle of the block knock down d at an obtuse angle with layered faults, whereby the worked-up fault space before laying the layers is filled with beat ore, which is extracted before the subsequent ore excavation, and the transport and delivery workings in the filling mass are formed in the inner strip by forming a pile of beat ore, which is shipped after the mixture has hardened to the beginning of the extraction of ore reserves. Fig. /> 1219896