SU1458573A1 - Method of mining steep ore bodies - Google Patents

Abstract

The invention relates to mining promet and m. used in the extraction of minerals in deposits of small and medium power. The goal is to increase the development efficiency by improving the recovery rates and the quality of the broken rock mass. The preparatory development and the reinforcement of reinforcement of the rocks are hanging on the sides. Before breaking off the chamber stocks, preliminary strengthening of the interfloor pillar (MC) is performed by installing parallel to each other and the lower contour of the MC, removable prestressed anchors into the drilled wells. After the attachment of the MTS, they proceed to the breaking down and release of ore in the chamber. After the release of the rock mass broken off in the chamber before redemption of the MC, the anchors are removed from the wells, the MC is disassembled and the reinforcing-rock overlap is formed, consisting of anchors and rock blocks that hang. The rock mass repulsed from the MC is released under the protection of the specified overlap. 1 hp f-ly, 3 ill. i (L

Description

one

The invention relates to the mining industry and can be used in the extraction of mineral resources in small and medium-sized deposits.

The purpose of the invention is to increase the development efficiency by improving the recovery rates and the quality of the broken rock mass.

FIG. 1 shows the scheme developed. Ki on the cut along the strike of the ore body; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one.

The method is carried out as follows.

Known techniques and technological; With these operations, the block is prepared for the clearing notch, including the drilling drift 1, which is used for breaking the ore in chamber 2 and reinforcing the hanging of the side 3 located at a stable height of the hanging of the side of the chamber and loading drift 4. From the loading drift 4 drills a borehole 5 for fastening the interfloor pillar 6. The removable anchors 7 with perfox locks are installed in the boreholes 5, and the preloads are placed at the intersection, and the locking parts are located behind the intersection line of the planes lozheny hole for hanging which attachment unit 3 and interfloor pillar. 6. Wells for fastening the interfloor pillar are drilled parallel to each other and the lower pillar contour. Preliminary reinforcement of the interfloor pillar 6 produces the formation of additional compressive stresses prior to the cleaning works by tensioning the supporting elements of the anchors 7.

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The fastening parameters of the intermediate pillar are determined from the following considerations. The intermediate deck, reinforced with prestressed anchors, is a rock-and-metal overlap, mounted on rigid supports and carrying a vertical load. Zanked at the bottom, the rear sight perceives the vertical pressure of the collapsed rocks q. The intermediate pillar is the transmission link between the collapsed stratum and the current elements of the anchors. The pressure q on the anchors is not fully transmitted. Some of this pressure is taken up by the whole floor. The magnitude of the transmitted pressure on the anchors q can be determined by the ratio

I q (m-h ".tgti.) -HM.u, Pcos tg2vi (1 -),

Where

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t /) is the angle of internal friction; W- power of the ore body; Bn.-c the height of the intermediate pillar; f - coefficient of lateral resistance of rocks of lateral rocks.

Here q means the vertical pressure transmitted by the interfloor floor entirely to the anchors of 1 rm. along the strike of the camera. The vertical pressure on one anchor is determined by the formula

Qo q a, where a2 is the anchor installation step.

For given values a, q, R, the calculation of the parameters of the fastening of the intermediate pillar is reduced to the determination of the required cross section of the anchor bearing element

where K. is the tensile strength of the carrier element of the anchor; 40 E is the modulus of elasticity of the carrier element of the anchor.

five

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since the load is evenly distributed along the length of the anchor 1 t. If the specified value is Fa and R (based on the materials and design of the anchor), then the required anchors for installing anchors can be determined.

After securing the interfloor pillar, they proceed to the breaking down and release of ore in chamber 2, before repaying the interfloor pillar 6, the anchors 7 are removed from the wells 5, and the interfloor pillar is unlocked.

By reinforcing the interfloor pillar, they form a reinforcement-rock ceiling 8, consisting of anchors and rock blocks that hang on the sides.

When the interdigital chamber is bored, wells 5 can be used to destroy charges. The release of the rock mass repulsed from the pillar is carried out under the protection of the ceiling 8.

Claims (2)

1. A method of developing steeply dipping ore bodies, including sinking preparatory workings, reinforcing reinforcement of the hanging rocks, breaking down the reserves chamber with the formation of an interfloor pillar, discharging rock mass repulsed in the chamber, disrupting the interfloor pillar, and releasing repulsed rock mass, characterized by In order to improve the efficiency of development by improving the extraction and quality of the broken rock mass, before breaking down the chamber reserves, the mid-rise pillar is reinforced by installing removable sprung anchors, and after release of the rock mass broken off in the chamber, the reinforcement of the pillar forms a reinforced-rock covering and releases the rock mass broken off from the pillar under the protection of the specified overlap. 2. A method according to claim 1, characterized in that the removable pre-stressed anchors are installed in parallel with each other and with the lower contour of the rear sight. U3.1 A -A 5-6 PT1 CZZZID Tz. (rig d