RU2521234C1 - Creation of filling massif at development of deposit under permafrost conditions - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: proposed method comprises construction of drainage dam, erection of pulp duct, feed of backfill pump and drainage of water via drain openings in bulkheads mounted on the side opposite the pulp feed. Drainage pipes in soluble airtight shell are fitted in filled goaf. Cooled compressed air is fed to said pipes at the feed of filling pulp. Note here that dressing tails thickened to pasty state are used as a filling pulp.

EFFECT: shorter pulp dewatering interval, higher strength of backfill.

1 dwg

Description

The invention relates to the mining industry and can be used in the development of deposits with the laying of the developed space in permafrost.

A known method of erecting a filling array (patent for the invention of the Russian Federation No. 2024768, publ. 15.12.1994). Part of the worked out space under the ventilation drift is left unclosed, and after the movement of the mechanized roof support fencing, an additional container is formed, where the filling slurry is fed in full for one cycle, the water is held until clarification, then the water separators are opened in the powered roof support and the waste water is sent for reuse.

The disadvantage of this method is the low productivity of the filling operations associated with a long period of dehydration of the filling pulp and the low strength of the resulting filling array.

A known method of hydraulic laying of chambers on dipping formations (RF patent No. 2166639, publ. 10.05.2001). The method of hydraulic laying of chambers on dipping layers includes the construction of inclined filter elements, the supply of pulp to the chambers, and the removal of filtered water. The laying of the cameras is carried out in two stages. Initially, a part of the chamber and a previously completed inter-chamber fault are laid simultaneously, leaving a gap between the stowage array and the fault roof, after which an inclined filter element is installed in the chamber near the fault, exceeding the design height of the stowage array, and the chamber is re-laid.

The disadvantage of this method is the low productivity of the filling operations associated with a long period of dehydration of the filling pulp, and the low strength of the resulting filling array.

A known method of hydraulic laying of chambers (AS USSR No. 1788299, publ. 15.01.1993). The filing material is supplied through the wells drilled in the working roof, the filling mixture is fed through the wells alternately at several points by successively opening the wells at the supply points after the array has been raised to the maximum height at the previous supply point.

The disadvantage of this method is the low productivity of the filling operations associated with a long period of dehydration of the filling pulp, and the low strength of the resulting filling array.

A known method of hydraulic laying of long single workings, adopted as a prototype (RF patent No. 2384711, publ. 03/20/2010). The method includes the construction of retaining and filtering jumpers, installation of slurry piping, feeding filling pulp. Water is drained through drain holes in the filter bridges installed on the side opposite to the pulp supply. The filing of the filling pulp into the laid space is carried out through a pulp conduit with holes in the lower part, attached to the roof of the mine for its entire length. The holes in the initial part of the slurry pipeline are provided with flap valves.

The disadvantage of this method is the low productivity of the filling operations associated with a long period of dehydration of the filling pulp, and the low strength of the resulting filling array.

The technical result of the invention is to reduce the period of dehydration of the filling pulp and increasing the strength of the resulting filling array.

The technical result is achieved by the fact that in the method of erecting a filling massif during field development under permafrost conditions, including erecting a retaining and filtering jumper, installing a slurry pipe, supplying filling slurry and draining water through drain windows in jumpers installed on the side opposite to the pulp supply, according to According to the invention, drainage pipes are installed in the pledged space in a soluble, airtight shell, and during the filing of the filling pulp into the drainage pipes ayut cooled compressed air, wherein in use as a backfill slurry tailings, concentrated to a paste.

The method of erecting a filling array during field development under permafrost conditions is illustrated by schemes, where Fig. 1 shows a bookmark scheme using pre-installed drainage pipes, a longitudinal section of the laid space, where:

1 - laying space;

2 - slurry pipeline;

3 - airtight soluble sheath worn on drainage pipes, for example from paper;

4 - holding jumper;

5 - filter jumper with windows;

6 - drainage pipes;

7 - filling array obtained from filling pulp, for example from enrichment tailings condensed to a paste-like state, by draining water from them and freezing it with circulating cooled air;

8 - fastening of drainage pipes to the roof.

The hydraulic laying of the worked-out space with the subsequent freezing is one of the cheapest in comparison with other types of laying. The main problem in the construction of filling structures is the fastest possible discharge of process water. The drain rate actually regulates the productivity of bookmarking. As a rule, the filling material (filling pulp) contains small (clay) particles (with a size of less than 0.05 mm) that are carried out with water and accumulate at the filtering jumper 5, forming an array with a low filtration coefficient. Due to the low filtration coefficient of this filling array, timely water loss becomes impossible and the process of forming the filling array is disrupted, which reduces the productivity of laying work. This disadvantage can be eliminated by installing 1 drainage pipes in the laying space 6. In this case, the views will be drained occur evenly along the entire length of the laid space 1 along the inner space of the drainage pipes 6. In this case, most of the small particles remain filling mass is being built and is not involved in the turnover process water. In this case, the backfill array 7 will be created with higher productivity due to the rapid discharge of process water, while its strength properties will be more consistent in length and height. To accelerate the withdrawal of process water from the filling pulp while freezing the filling mass, you can use chilled compressed air. Due to the creation of ascending air flows in the filling pulp, clay particles will be mixed, which in turn contributes to the absence of clogging of holes on the surface of the drainage pipes for their most efficient operation. Due to the circulation of chilled air through the filling array, a durable filling array 7 will be obtained from the frozen paste bookmark containing a sufficient amount of water.

When designing the layout of the drainage pipes 6 in the laying space 1, it is necessary to take into account their laying depth, as well as the distance between them, which depends primarily on the mechanical composition of the filling pulp. The maximum distance between the drainage pipes 6 with a large number of clay particles is 10 m, with a smaller amount it can be increased up to 50 m. Closer arrangement of the drainage pipes 6 allows you to increase the speed of dewatering of the filling array, but leads to higher cost of work.

The method of erection of the backfill array in the development of deposits in permafrost is as follows. A slurry pipe 2 is attached to the roof of the paved excavation 1. A retaining 4 and a filter jumper 5 with drain windows are erected. Serve filling pulp with a drain of water through the drain window of the filter jumper 5, blocked by filter material. The filter jumper 5 is installed on the side opposite to the inlet of the filling pulp. Before feeding the filling pulp in the paving space 1, the design number of drainage pipes 6 is installed and secured with fasteners 10, for example, with anchors, with a slope towards the filter bulkhead with a design step vertically and horizontally with their fastening either to the roof, or to the soil, or to the sides of the excavation . The method of attachment 8 of the drainage pipes 6 is adopted taking into account the properties of the enclosing rocks and the availability of means for mechanizing the fastening process. For example, the fastening of 10 drainage pipes 6 into the roof of the laid space 1 seems appropriate in case of good stability of the roof rocks. Anchors are fastened with the necessary vertical and horizontal steps to the roof of the space to be laid 1, leaving the ends protruding into the work to be laid for the installation length of the drainage pipes vertically 6. The installation step of the anchors along the production length is determined depending on the stiffness of the adopted drainage pipes 6 to exclude them sagging up to the moment of filling filler pulp. Drainage pipes 6 before installation are placed in airtight water-soluble shells 3. Shells 3 can be made, for example, of paper. During the filing of the filling pulp, which is used as tailings, concentrated to a paste-like state, compressed chilled air is supplied to the drainage pipes 6. Due to the dissolution of the shell 3, the cooled compressed air is supplied to the sections of the drainage pipes 6, on which it is necessary to create the most efficient drainage while freezing the filling array. After the filing of the filling pulp and the discharge of technological water from it and freezing, the filling mass 7 of increased strength is obtained.

The use of this method of erecting a backfill array during field development under permafrost conditions during underground field development helps to provide the following advantages:

- reduce the period of dehydration of the filling pulp;

- increase the strength of the resulting filling array;

- reduce the removal of clay particles from the filling pulp;

- increase the safety of laying operations.

Claims (1)

A method of erecting a filling massif during field development under permafrost conditions, including the construction of a retaining and filtering jumper, installing a slurry pipe, feeding the filling pulp and draining water through drain windows in jumpers installed from the side opposite to the pulp supply, characterized in that they are installed in the laying space drainage pipes in a soluble, airtight shell, and during the filing of the filling pulp, cooled compressed air is supplied to the drainage pipes, while In the filling pulp, enrichment tails condensed to a pasty state are used.

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