RU1803562C - Method of erection of artificial pillars in underground working of mines - Google Patents

Abstract

Usage: it is used in underground mining of ore bodies lying in rocks containing rather soft or medium strength layers to reduce costs by reducing the cost of cementitious mortars and increase the safety of work as a result of increasing the bearing capacity of pillars when erected in a worked out space mined by layers of chambers and places of subsequent sinking of threaded workings. SUBSTANCE: preparation and delivery of rock blocks, laying of rock blocks in the workings and fastening of blocks adjacent to the walls of the chambers into the cementing mortar are carried out. The pillars form a step-like shape, the steps are formed when excavating ore layers with a height that is a multiple of the height of the rock blocks, the blocks are fastened in the cementitious mortar with the walls of the chambers and in the places of the subsequent sinking of the cut workings. current. The gaps between the non-cemented blocks are filled with the destroyed rock with a particle size of three or more times less than the deviation: the sizes of the blocks from their average value. In places of subsequent sinking of the threaded workings, the blocks are additionally fastened together by anchors of materials destroyed by mining machines, 2 silt. : WITH

Description

The invention relates to mining and can be used in the underground mining of ore bodies occurring in rocks containing rather soft or medium strength layers.

The purpose of the invention is to reduce costs by reducing the cost of cementitious mortars and increasing the safety of work as a result of increasing the bearing capacity of pillars when they are erected in the worked-out space of the layers worked out by the layers and in the places of the subsequent sinking of the excavated workings.

This goal is achieved by the fact that in the method of erecting pillars in underground mines, including the preparation and delivery of rock-: blocks, laying rock blocks in the workings and fastening blocks adjacent to the walls of the chambers (ce00

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the faces form a ledge-like shape, while the ledges are formed when excavating ore layers with a height that is a multiple of the height of the rock blocks, the blocks are fastened in the cementing mortar with the walls of the chambers and in the places of the subsequent drilling of the excavated workings, the gaps between the non-cemented blocks are filled with crushed rock with coarseness particles are three or more times smaller than the deviation of the sizes of the blocks from their average value, moreover, in the places of the subsequent sinking of the rifled workings, the blocks additionally fasten the anchor to each other mi of material destructible winning machine.

In FIG. 1 shows artificial pillars erected in an ore mass during the development of a deposit; in FIG. 2 - artificial pillars at the site of the rifled workings.

Excavation of the ore body is carried out by primary 1 and secondary 2 chambers with the construction of an artificial pillar in the primary chambers from blocks with smooth faces cut in rocks of rather soft or medium strength, for example rock salt. Blocks 3 are laid on a pillow of fine rock. The space between blocks 4 is also filled with the same rock. To ensure efficient filling of the space between the vertical faces of the blocks and even space between the vertical faces of the blocks and even distribution of the load between the blocks in the vertical and horizontal planes, the maximum fineness of the fine rock should be three times less than the deviation of block sizes from their average value.

The space between the blocks and the ore mass around the entire perimeter of the pillars is filled in the cementitious mortar 5. In the places of the subsequent cutting workings 8, the blocks are laid on a layer of cementitious mortar. The spaces between blocks 7 are also filled with the same solution.

To increase the adhesion of the pillars to the ore body, they are given a step-like shape. The height of the ledges is taken equal to the height of the layers to be removed and to the multiple height of the blocks.

To increase the stability of the spans in the places of the subsequent sinking of the threaded workings, the blocks are additionally fastened

between themselves with anchors 9, destroyed by excavating machines in the process of sinking excavations.

The space between artificial

the pillars formed after the extraction of the natural pillars by the secondary chambers 2 are filled with filling material 6.

Blocks for the construction of artificial

pillars are cut near the place of production of mining operations in rocks of rather soft or medium strength using self-propelled cutting machines, and delivery of blocks to the place of production of works on the construction of pillars is carried out by forklift trucks.

The application of the proposed method allows to reduce the cost of erecting pillars and increase their bearing capacity,

and also will allow several times to reduce the consumption of cement, reduce the cost of building a surface complex for the preparation of hardening bookmarks.

Claims (1)

The claims A method of erecting artificial pillars in underground mine workings, including preparing and delivering rock blocks, laying rock blocks in the workings and fastening blocks adjacent to the walls of the chambers with a grout, characterized in that, in order to reduce costs by reducing costs cementitious mortars and increase the safety of work as a result of increasing the bearing capacity of pillars when they are erected in the worked-out space of chambers worked out by the layers and places for the subsequent sinking of rifled workings, ki ustupoobrazno formed shape, wherein the ledges Layout layers removed during excavation of ore height times the height of rock blocks, bonding the binder solution is carried out blocks with the walls of chambers and places the subsequent sinking of the rifted workings, the gaps between the non-cemented blocks are filled with the destroyed rock with a particle size of three or more times less than the deviation the sizes of the blocks from their average value, moreover, in the places of the subsequent sinking of the threaded workings, the blocks are additionally fastened to each other with anchors from materials destroyed by mining machines. 0g / g.