RU2455488C2 - Method to recover outbalance reserves in combined development of coal beds - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: method to recover outbalance reserves includes open mining and boring a bed according to the underground technology of deep mining of coal beds. When mining a series of flat-dipping beds, including a coal bed with outbalance reserves, overburden rocks are divided into ledges, and a working site of one of ledges is placed on the soil of the bed with outbalance reserves. Then these reserves are bored with the help of a complex of deep mining of beds for the maximum possible depth of chambers. Overburden works and extraction of lower payable beds is carried out with a delay from drilling works. Upon extraction of payable beds, works to bore outbalance reserves are continued, and they are performed cyclically until final mining of this bed in the field of the coal strip mine.

EFFECT: recovery of outbalance reserves available within borders of a coal strip mine field.

2 dwg

Description

The invention relates to the mining industry and can be used in the combined development of coal seams to extract off-balance coal reserves.

A known method of the combined development of shallow seams of coal deposits, including conducting opencast mining, drilling a seam using underground technology for the deep development of coal seams ([1] - prototype).

The main disadvantage of this technology is that according to the known technology, coal reserves of only one strip can be extracted along the stopped opencast mining.

In addition, work on known technology is performed on one layer.

The technical task was the ability to extract off-balance coal reserves over the entire area of the seam in the coal mine field.

The proposed method is characterized in that during the development of a suite of shallow beds, including a coal seam with off-balance reserves, overburden is divided into ledges, the working platform of one of the benches is placed on the soil of the seam with off-balance reserves, and these reserves are drilled using a deep formation development complex to the maximum possible depth of chambers, overburden operations and excavation of underlying workings are lagging behind drilling operations, and after excavation of workings, drilling operations are unbalanced O reserves are repeated and carry them cyclically to the complete working out of the formation into the coal mine field.

The essential feature introduced into the formula, such as the fact that overburden is divided into ledges, the working platform of one of the ledges is placed on the soil of the formation with off-balance reserves, allows you to place complex equipment for deep formation development without additional bedding.

An essential sign that off-balance reserves are drilled to the maximum possible depth of the chambers provides for one-time drilling of reserves overburden operations in several rounds.

An essential sign that stripping operations and excavation of underlying workings are lagging behind drilling operations makes it possible to timely excavate off-balance reserves.

The next significant sign that after excavation of working seams, work on drilling off-balance reserves is repeated and performed cyclically, ensures the completeness of the extraction of these reserves in the coal mine field.

The essence of the method is illustrated by drawings, where figure 1 shows in plan a section of open cast mining and underground drilling of off-balance reserves, figure 2 - section aa in figure 1.

Symbols adopted in the drawings:

1 - coal deposit; 2 - formation retinue; 3 - reservoir with off-balance reserves; 4 - working platform ledge; 5 - formation soil with off-balance reserves; 6 - HGRF; 7 - drilled chambers; 8 - working layer; 9 - interchamber coal pillars.

The method is as follows.

Coal deposit 1, represented by a retinue of gently dipping seams 2, has a seam 3 with reserves related to off-balance, for example, due to the low power of the seam. As a rule, such layers are extracted together with the overburden rock and can cause the burning of waste dumps. First, they plan to conduct overburden work so that the working platform 4 of one of the ledges coincides with the soil of formation 5, which has low power and off-balance reserves. After opening the exits of this formation 5, they begin to drill it with a complex of deep development of formations 6 (fracturing). In this case, the depth (length) of the chambers 7 is performed as high as possible. The practice of fracturing in Kuzbass and South Yakutia showed that the chambers can be 300 m long. Overburden work is then carried out both above and below the drilled formation 5, exposing and removing working reservoir 8. In the process of extracting overburden rocks above the reservoir, 5 chamber voids 7 and interchamber coal pillars 9 do not cause difficulties for the operation of heavy mining equipment. For excavation of the reservoir 8, it is necessary to make several calls in one pass of the hydraulic fracturing. The next drilling of the formation 5 is carried out after the excavation of the formation 8 and repeat such excavation cyclically until the complete development of the formation 5, which is in the field of the coal mine.

The advantages of the proposed method are:

- additional extraction of coal off-balance reserves;

- the exclusion of ignition of waste dumps.

Information sources

1. RF patent No. 2312218, Cl. 7 E21C 41/00, 2007

Claims (1)

The method of extraction of off-balance reserves in the combined development of coal seams, including open pit mining, drilling of the seam using underground technology for deep mining of coal seams, characterized in that during the development of a suite of shallow seams, including a coal seam with off-balance reserves, overburden is divided into ledges, working the site of one of the ledges is placed on the soil of the formation with off-balance reserves, and these reserves are drilled using a complex of deep development of reservoirs at maximum DUTY possible depth cameras stripping recess and underlying layers are working with a lag of works for drilling out, and after drilling out of the recess of the working stocks off-balance layers and perform their repeated cyclically to complete the formation of a mining coal mine field.

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