RU1789696C - Method for mining mineral deposits - Google Patents

Abstract

The invention relates to the mining industry and can be used in underground mining with the laying of the developed space. The goal is to increase the safety of work under conditions of increased mountain pressure, reduce the volume of backfill work and increase the intensity of development. The field is divided into horizons, and within the horizons into excavation production sites, which are worked out by the cameras of the first (K1) and second (K2) stages. Temporary ore pillars are left between floors and production sites. After working off K1, they are laid with expanding thixotropic mixtures. Sensors are installed in the ore pillars to record the stress-strain state of the array. Testing K2 begins after the sensors have registered the beginning of a decrease in the stress-strain state of the array in K2 due to the effect of the expanding mixture on the roof K1. In a similar manner, the start of mining of inter-section and inter-floor pillars after mining K2 and their laying with expanding mixtures is determined. On each horizon, after 60-100 m along the strike of the ore body, the technological space of one K2 is formed, the mining of which is carried out after the mining of chamber reserves in two adjacent sections along the strike. with

Description

The invention relates to the mining industry and can be used in underground mining with the subsequent laying of the mined-out space.

A known method of developing deposits, including the excavation of the chambers of the first and second stage and the laying of the developed space with hardening mixtures.

The closest technical solution is the development method, including working off sections with first and second stage cameras with separating pillars between sections, laying chambers of the first stage with hardening mixtures, working out second stage cameras between cameras of the first stage after acquiring the specified strength properties by bookmark, laying the second cameras queues with expanding mixtures and subsequent mining of pillars with the formation of an unclosed technological space in them.

The disadvantages of the known methods are the low safety of work, especially in conditions of high mining

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pressure, high volume of backfill operations and low development intensity.

The purpose of the invention is to increase the safety of work under conditions of high rock pressure, reduce the volume of backfill work and increase the intensity of development.

This goal is achieved in that the spent chambers of the first stage are filled with expanding mixtures, and the beginning of the working of the second stage chambers and interchamber pillars is determined by recording by the sensors the beginning of the reduction of the stress-strain state of the array of these pillars due to the effect of the expanding mixture on the roof moreover, on each horizon and production area, in 60-100 m along the strike of the ore body, the technological space of one chamber of the second stage is formed, and this chamber is mined le mining chamber reserves in two adjacent areas along strike.

The method is carried out as follows.

The deposit is disassembled into horizons, and within the horizons - into excavation areas, which are worked out by cameras of the first and second stage. Between floors and excavated production sites, temporary ore interfloor and inter-site pillars are left. After testing the chambers of the first stage, they are laid with expanding thixotropic mixtures. The preparation of expandable mixtures is carried out by known methods. In ore pillars (interstage, inter-section and pillars of untreated chambers of the second stage), a sensor is installed to record the stress-strain state of the array. The processing of the second stage chambers begins after the sensors detect the beginning of the reduction of the stress-strain state of the array in the pillars of these chambers due to the effect of the expanding filling mixture on the roof of the first stage chambers. In a similar way, the start of mining of inter-section pillars after mining of chambers of the second stage and their laying with expanding mixtures within two adjacent sections and of inter-storey pillars after mining and laying of two adjacent horizons are determined. After working off the indicated pillars, they form an unfilled technological space in the bookmark or fill their developed space only partially.

It has been established that a maximum discharge zone of 30-35 m is formed in the array adjacent to the exposure when the exposure span of 60-70 m is reached, after which it remains constant. Therefore, at each horizon, after 60-100 m along the strike of the ore body, the technological space of one chamber of the second stage unfilled by laying is formed, the mining of which is carried out after mining of chamber reserves in two adjacent sections along the strike.

Claims (2)

1. The method of mining mineral deposits, including the preparation of rifled workings, dividing the ore body into floors and production sites, mining sites cameras of the first stage, laying them with hardening mixtures, working out the cameras of the second stage between the cameras of the first stage after acquiring the set properties by bookmark expanding mixtures, the subsequent development of inter-dimensional pillars with the formation of the technological space, characterized in that, in order to increase the safety of work in conditions increased mountain pressure, reduced volume of laying works and increased development intensity, spent chambers of the first stage are filled with expanding mixtures, and the beginning of working of chambers of the second stage and interchamber pillars is determined by recording by sensors of the beginning of reduction of the stress strain state of the array of these pillars by exposure an expanding mixture on the roof. 2. The method according to claim 1, characterized in that on each horizon of the production section, 60-100 m along the strike of the ore body are formed the technological space of one chamber of the second stage, mining of this chamber is carried out after mining of chamber reserves in two adjacent sections along strike.