Method for extracting stripping rock

FIELD: mining industry, possible use during open combined excavation of bed deposits with two coal formations with alternating extraction of formations and parting and technology of stripping operations based on transporting and non-transporting excavation system.

SUBSTANCE: in accordance to invention, at predetermined sections usable for processing parting in accordance to transport-less dragline technology, special dumping vessels are created and moved for required value towards excavated space, meant later for excavation of parting rocks into them. Volumes and amount of these vessels is determined depending on mining conditions and parameters of stripping equipment. Therefore, a part of volumes of transport stripping is redistributed to non-transport stripping.

EFFECT: lower costs of stripping operations and less harmful blowouts into atmosphere from vehicle transport.

1 ex, 1 tbl, 1 dwg

 

The invention relates to the mining industry and can be used to open the combined development of bedded deposits with two coal seams, with alternate notch seams and mitoplast and technology Stripping on the basis of transport bestransportnye development system.

The known method bestransportnye development overburden for alternate notches of the two coal seams and mitoplast, including a number of complicated technological schemes [1].

Common in these schemes is the availability of trained space from inside the dumps for laying of internal and external overburden (mitoplast). The seam parting can be developed directly from its roof, and pretotal. Excavation in these schemes is carried out with the upper and lower drawing, and provides consistent placement of equipment (each other). The main drawback of these schemes are significant amounts of preexcavation, needapresent them to the oil fields of the zone of permafrost (permafrost).

Field of the permafrost zone are characterized by such features, in which the direct use of the above mentioned technological schemes impossible. These features should include mandatory drilling and blasting training marzani the shattered rocks after the explosion, the inability to work with the top draws and usually a lack of tanks for internal overburden (mitoplast) from inside the dumps.

Freezing breed determines the length of the excavation block. Safety distance between excavators should not be less than 2 times the radius of the stock (including the casting ladle for draglines). Given the significant amounts of preexcavation on the above schemes, as well as preparatory operations for installing excavator on predator, planning work, consistent work dragline is rather problematic.

The closest to the technical essence and the achieved effect is the way to develop overburden, in which by means of a special organization of work and by limiting the length of the excavator unit depending on the determining factors can significantly reduce or even completely eliminate the influence of the secondary freezing rocks.

This technology includes: drilling and blasting of the upper pedostop, excavation blasted rock from the roof of the lower pedostop in predator, drilling and blasting the bottom of pedostop and excavation shattered rocks in the final contour of the blade.

The method is as follows.

First, the two approaches work exploded on reset breed top photostop is. When performing the first Zachodni dragline prepares the ground standing, removing the upper part of the collapse, located on the roof of the lower pedostop. Moving along the front of the work, he excavatum portion of the volume of the upper pedostop in the direction of the goaf, creating predator. After completing work on the first section of the dragline moves to a pre-planned predator. Working here, he moves predator and rocks of the upper pedostop, not included in the final contour of the blade in the scope of this outline.

Then organizes the work on the lower pedoscope. After blasting onto the surface of a slope of the blade dragline, performing a third section, preparing a site standing and at the same time excavatum volumes of the second pedostop in the final contour of the blade.

Excavating in the block must be executed before the completion of the freezing process, the length of the excavator unit should be no more than [2]:

,

where Qe- operational performance of the excavator;

Tpthe temperature of the breed;

dcpthe average size of the piece;

a - thermal diffusivity of rocks;

Tin- temperatures;

In - the width of the excavation Zachodni;

h - the height of pedostop;

Kp, Kwith, Knrespectively the coefficients of loosening, reset is preexcavation.

This principle with constraint length of exploding block is successfully applied when developing one Stripping ledge.

The disadvantage of this method is that it involves testing mitoplast transport scheme (ECG + vehicles), which leads to high cost of Stripping and increases harmful emissions into the atmosphere career. It should be noted that the cost of development 1 m3overburden on bestransportnye technology 2.5 and 5.4 times less than the cost of mining 1 m3transport technologies, and it would be highly expedient refinement of mitoplast also bestransportnye technology. It is necessary in the absence of free space from inside the dumps to reallocate the amounts or part of the volume transport of overburden (mitoplast) bestransportnye technology and produce the excavation of mitoplast the dragline to the final contour of the blade.

To solve this task by creating pre-defined areas, suitable for testing mitoplast on bestransportnye technology, special conveyor capacity for work. In the process of developing ledge external overburden dragline slip on design value towards the goaf and create special otvalnuyu capacity, the cat is the ROI subsequently Excalibur species mitoplast.

This solution requires a thorough examination of the mining conditions of the development work, a preliminary assessment of the possibility of inserting a dragline species mitoplast in the final contour of the blade in the cramped conditions of the lower part of the quarry working area and allotments bestransportnye testing mitoplast.

Evaluation of the possibility of laying a dragline species mitoplast in the final contour of the blade and the allocation of plots his bestransportnye testing carried out on the basis of parameters of the excavator and parameters working area: capacity of overburden layers of minerals, interbed thickness, width zagadki.

The length of the generated capacity will be determined as follows.

Let hm- power mitoplast, m;

AndZech- the width of the excavation zagadki, m;

Lbest- length to front of work, which you can use bestransportnye technology testing mitoplast;

Vm- volume mitoplast in this area of work, m3.

Vm=hm·AndZech·Lbest;

hOTC- the length of the slope of the blade, m;

m - adopted by the tank depth, m;

Lcontainer- length of the generated capacity, m

The amount of generated capacity must be equal to the amount of mitoplast, which must be laid in a pile by the dragline.

.

And then the required length of the generated capacity:

.

The parameter m characterizes the magnitude of the displacement axis of the dragline towards the goaf when creating a special container. This parameter depends on the interbed thickness and volume of preexcavation when creating moldboard capacity.

When creating a dump tanks will happen some increase in preexcavation, which would then be offset by the difference in the cost of development on transport and bestransportnye technologies.

From the analysis above analogues shows that when combined open development bedded deposits with two coal seams, with alternate notch seams and mitoplast bestransportnye development of mitoplast known, but if there is an empty space from inside the dumps. In conditions where no such space, forming it around the front of the work on the fields of the permafrost zone is not feasible, since entails significant costs, such as interior piles, drilling them, blasting and re-excavation in the side of the goaf. Moreover, in terms of the seasonal nature of these operations will break Stripping and accordingly the preparation of the stock is s fossil.

The proposed method of mining overburden, including the drilling unit and blasting of overburden ledge excavation blasted rock from the roof top of a layer mineral in predator, subsequent excavation of pretotal and the remaining volumes in the final contour of the blade, drilling, blasting and mining of the upper reservoir of minerals, drilling, blasting and mining of mitoplast differs from pre-defined areas, suitable for testing mitoplast on bestransportnye technology, dragline slip on design value towards the goaf and create special otvalnuyu capacity, intended for later excavation of volumes mitoplast, while the length of this capacity will be determined from the expression:

.

All of this suggests that the present invention has novelty and inventive level.

The proposed technology has the following advantages compared with prototype:

- 2.5-5.4 times reduced the cost of development mitoplast;

- reduced transport overburden, resulting in part of the Park of vehicles released to work on other, more complex areas of development;

- reduced harmful emissions into the atmosphere.

The possibility of carrying on the frame of the method of redistribution of the volume transport of overburden on bestransportnye depends on the mining conditions of development, parameters of the working area of the quarry and settings Stripping equipment - excavator-dragline.

The drawing shows the method of mining overburden with pre-generated special waste containers for species mitoplast.

The method is as follows. After blasting onto the ledge external overburden excavator begins excavation collapse of blasted rock in the final contours of the blade. At predetermined areas, suitable for testing mitoplast on bestransportnye technology, dragline slip at the desired value of m in the direction of the developed space and create a special otvalnuyu capacity. The length of this capacity will be determined from the expression.

In areas where it is impossible to create such capacity, stockpiling carried out in the usual way, without displacement of the axis of the excavator.

After working overburden bench work out the upper layer of the fossil. Then proceed to the development of mitoplast. After blasting in areas with pre-generated waste containers Excalibur the seam parting the dragline to the final contour of the blade. In other parts of the seam parting work in transportation technology. Then work out the lower layer of the useful and the dig.

Consider a specific example of calculation of the study parameters m and Lcontainerfor example, the section "Kangalassky" OJSC HC Yakutugol.

Mining and geological conditions of the coal-bearing sediments Kangalassky deposits predetermined split line taken in the context of transport and bestransportnye development systems.

Boundary separation is currently the top layer of the Upper. The decision is due to the considerable capacity of overburden, reaching 38 PM

External overburden on the cut "Kangalassky" higher layer "Top" fulfilled by bestransportnye technology dragline ESH-10/70 with filling in the internal dumps.

Present on the inner section of overburden (the seam parting), represented by clays, siltstones and sandstones, being developed by transport technology with excavation EKG-5A and transported by trucks Bela-75405 also in the internal dumps.

Power external overburden in areas of the field varies in the range of 3 characteristic values. It plots with the capacity of overburden of up to 10 m plots with an average cover thickness of about 25 m, and plots with the capacity of overburden sediments up to 38 meters

For substantiation of the parameters m and Lcontaineryou first need to determine the possibility of excavation internal overburden in the final contour of the blade in given the circumstances.

Substantiation of the parameters setting for dragline excavation internal overburden in the final contour of the blade was made by the graphic-analytical method in accordance with the parameters of the system development at the company. If this were the variants with different capacities external overburden and width of excavation Zachodni 40-60 m the calculated power of the internal Stripping of 2.5-3.0 m Depth created capacity were taken in the range of 2-10 m, with an interval of 2 m evaluation Criteria - free passage of the bucket of a dragline over any point of the blade during its unloading compliance with safety distances in accordance with the regulations. That is, such technical parameters as the height and radius of the discharge, are the limiting factor for parameters moldboard embankment.

As a result of calculations, it was found that in data mining conditions, the maximum height of the ledge external overburden, which allows the creation of a special dump tanks is 20 M.

After that, the calculation of the technological scheme of mining ledge external overburden offset of the dragline and the creation of pile capacity. The offset, or the depth of pile capacity m were taken 2, 4, 6...10 m calculation Results are presented in table 1.

Table 1
The increment of the volume of preexcavation at various capacities overburden and settings excavation Zachodni %
Width ZachodniThe height of the ledge 10 m
2 m4 m6 m8 m10 m
A=40 mof 18.754085120,25166,25
A=50 mat 11.2527,744,464,1679,03
A=60 m1645,8364,8391,66130
Average %15,3337,8664,7592,02125,26
The height of the stupa 15 m
A=40 m12,2125,5846,7469,7794,92
A=50 m15,1034,3945,9289,79130,20
A=60 m18,6540,2775,67107,84152,16
Average %15,3233,4556,1189,1312559

Length of the plot with a capacity of overburden 15 m 100 m Volume mitoplast when the width of zagadki 50 m and interbed thickness of 2.5 is 2.5·100·50=12500 m3.

The height of the blade equal to 21 m and the length of the slope of the contour of the blade is 30 meters Then, taking the offset of the axis of the dragline is 4 m, we get the length of the generated capacity:

.

Sources of information

1. Meadow, Cielinski, Mgoto and other technology Development and technology of surface coal mining. - M.: Nedra, 1987. - 237 S.

2. Copyright certificate №1624152, CL. AS 41/00. The method of mining overburden / Dry, Assurance, Snitow and others (USSR). Appl. 17.10.1998. Publ. 01.10.1990. // Discovery, invention. - 1991. No. 4. - S.89.

The method of mining overburden, including the drilling unit and blasting of overburden ledge excavation blasted rock from the roof top of a layer mineral in predator, subsequent excavation of pretotal and the remaining volumes in the final contours of the blade, drilling, blasting and mining of the upper reservoir of minerals, drilling, blasting and mining between plastia, characterized in that the predefined areas, suitable for testing mitoplast on bestransportnye technology, dragline shift to the desired value in the direction of generated question the space and create a special otvalnuyu capacity, where Excalibur later volumes mitoplast, while the length of this capacity will be determined from the expression

Lcontainer=Vm/hOTCm, m,

where Vm- volume mitoplast in this area of work, m3;

hOTC- the length of the slope of the blade, m;

m - adopted by the tank depth, m;

Lcontainer- length of the generated capacity, m



 

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