Filling mass formation method

FIELD: mining.

SUBSTANCE: method involves arrangement of reinforcing elements made in the form of mesh in filling chamber at the boundary with rock ore to be developed. Reinforcing elements are arranged at distance of 0.05b from each other, where b - chamber width. After installation of reinforcing elements the worked out space is filled with filling mass of various strength. Lower, central and upper part of chamber is filled at 1/10 of its height with curing mixture, and space between them with hydraulic fluid from fine material without binding agent.

EFFECT: reducing the costs; improving manufacturing capabilities.

1 tbl

 

The invention relates to the field of mining and can be used for bookmarks treatment space in underground mining.

Known methods bookmarks waste space with differentiated by placing them in stowing mixtures with different content of binders [1]. The bottom layer bookmarks height up to 1.5 m contains up to 20% of cement, and a layer above it contains 9% of cement.

The disadvantage of this method is the high consumption of binders.

There is a method of bookmarks exhaust chambers, comprising feeding into the chamber backfill mixes with different binder content [2]. Bookmark cameras mixtures containing binders, produced in its lower part to the upper boundary of the underlying aquifer testing, next to the level of the soil horizon drilling implement a bookmark mixtures without binding. After shrinkage embedded array, filtration and evaporation of water around the perimeter of the camera in shrinking the gap place of the reinforcing structure. In the mortgaged array along the walls of the chamber are drilling wells to the level below the top of the glass layer bookmarks at the bottom of the camera. The portion of the array between the chamber walls and destroy the walls of the wells. In well insert reinforcing bars above their above the level of the embedded array. And then wells and shrink the gap salivation, containing binder, after which the upper part of the chamber fill with a mixture of astringent.

The disadvantage is the large volume of work, the uncertainty in the magnitude of the strength of the formed array and the number of binding agents, high consumption of expensive fittings.

The closest is the method of hardening backfill array including placing of reinforcing elements in hardening filling the array camera on the border with the subject development ore array in which the reinforcing elements are in the form of nets made of basalt fiber, they place them in two rows, and the second row is placed at a distance of 0,05b inside the camera, where b is the width of the chamber, m [3]. After installation of the reinforcing elements in a goaf camera or layer serves hardening filling mixture.

The drawback is the large consumption of expensive cement achieved when the strength of artificial array (170 kg tensile-compression 6,47 MPa at the age of 90 days), which reduces the technological capabilities of the method.

Object of the invention is the reduction of costs for the construction of artificial array by reducing the proportion of cement and increase the technological capabilities of ways bookmarks exhaust chambers while maintaining the strength of the array.

To solve this problem, a method forming the Oia backfill array including the placement of reinforcing elements made in the form of a grid, filling the chamber at the boundary with the subject development ore array, and reinforcing elements are placed at a distance from each other 0,05b, where b is the width of the camera. After installing reinforcing elements goaf stowing the camera fill raznoobraznoi backfill mixture, the lower, Central and upper part of the chamber to about 1/10 of its height lay hardening the mixture, and the space between them slurry of fine material without binder.

The technical result is to reduce the consumption of expensive cement while maintaining the strength of the constructed array.

The method is as follows.

In the waste, but not yet laid the camera space or layer placed at ore array of reinforcing elements, such as a mesh made of basalt fiber, placed in two rows at a distance from each other 0,05b, where b is the width of the camera. After installation of the reinforcing elements in a goaf camera serves hardening filling mixture, filling it to the bottom layer of the camera to 1/10 of its height. Further, approximately 35% of the volume of the chamber, a bookmark, perform the mixtures without binding. After shrinkage laid layer, filtration and evaporation of water again on 1/10 form a layer of hardening zakladach the th mixture, at 35% of the chamber volume tab perform mixtures without binding. After shrinkage laid layer, filtration and evaporation of water at 1/10 form the top layer of hardening filling mixture.

Example

In order to check the efficiency of the proposed method were investigated on the samples. The sample preparation was carried out as follows: in form to a height of 1 cm was laid hardening filling mix (ultimate compressive strength of not less than 12 MPa), consisting of 18,3% granulated blast slightly basic slag quality factor K=1,45, ground to a specific surface area of 310 m2/kg, 54,9% tailings wet magnetic separation (hereinafter - MMC), 4.9% Portland cement M400 D20 and 1% of the cement content of superplasticizer SP-1, with Vodochody attitude 0,281, which was vibrated for 1 sec. Then laid slurry tailings MMS to a height of 3.5 cm, the mold was vibrated with an additional 1, then a layer of the above-curing a mixture of 1 cm, laid on him the slurry tailings to a height of 3.5 cm and the top layer of hardening a mixture of 1 cm; the form was vibrirovanii to appear on the surface of a thin layer of water for the simulation of filtration processes and shrinkage. The samples were fabricated in the form of cubes of size 100×100×100 mm, Then the samples were placed in the climate chamber and felt the camping strength after 90 days. In the prototype, the average consumption of cement 200 kg/m3reduced by 30,36 kg and is 169,64=(200-30,36). Test data are shown in table 1.

From the table it follows that the task of reducing cement consumption while maintaining the strength of the synthetic array is achieved even without reinforcing elements, but on condition of formation of three layers with a hardening filling mixture: lower, middle and upper. The presence of reinforcing elements provides more strength and stability of the formed array. In the absence of the upper layer, the strength of the sample is cut in half.

Table 1
The nature of the construction of the arrayThe cement content at 1 m3constructed array kgThe limit of compressive strength at the age of 90 days, MPa
the placeholder169,646,47
Interbeds hardening of the mixture in the middle, the top and the bottom sampleof 31.86,8
Interbeds hardening of the mixture in the middle, at the top, the sole specimen with reinforcement contact with the ore array layer of 31.8not less than 7.2
Interbeds hardening of the mixture in the middle and bottom sample21.23,4

Sources of information

1. Nonferrous metallurgy Sweden. Polyakov, V.I. Makarov, S.V. and other znii and Informatics nonferrous metallurgy. Issue 15, 1984, p.18.

2. Patent 2367797, publ. 20.09.2009.

3. Patent 2047780, publ. 10.11.1995.

The formation method of filling the array, including the placement of reinforcing elements made in the form of a grid, filling the chamber at the boundary with the subject development ore array, and reinforcing elements are placed at a distance from each other 0,05b, where b is the width of the chamber, characterized in that after the installation of reinforcing elements goaf stowing the camera fill raznoobraznoi backfill mixture, the lower, Central and upper part of the chamber to about 1/10 of its height lay hardening the mixture, and the space between them - a slurry of fine material without binder.



 

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2 tbl

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2 tbl

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