CONTINUOUS SYSTEM OF MINING UNSUITABLE FOR MANY DONBASS MINES

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000700060113-8
• Release Decision: RIPPUB
• Original Classification: R
• Document Page Count: 2
• Document Creation Date: December 22, 2016
• Document Release Date: October 6, 2011
• Sequence Number: 113
• Publication Date: April 24, 1952
• Content Type: REPORT

Sanitized Copy Approved for Release 2011/10/06: CIA-RDP80-00809A000700060113-8
CLASSIF!i;ATIOtJRTTE:yy>T'._ __'FD
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CENTRAL ILIG qG~D? REPORT
INFORMATION FROM
FOREIGN DOCUMENTS OR RADIO BROADCASTS GD NO.
COUNTRY USSR
DATE OF
SUBJECT Economic - Coal mining INFORMATION 1952
HOW
PUBLISHED Monthly periodical
WI RE
PUBLISHED Moscow
DATE
PUBLISHED Jan 1952
DATE DIST. z9 Apr 1952
NO. OF PAGES 2
SUPPLEMENT TO
REPORT NO.
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01 ml vino vin, xirwn Tilt lUwl., or ynou,, Am II
t. I. c..I~ Iwu as ?nwouu. m rownunow oI nI CM II PI .
or in cownwn IN ur Iuu ro Al uwlrnomv rumw a reo?
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THIS IS UNEVALUATED INFORMATION
Mekhnnizatsiya Trudovemkikh i Tvazhelykh Rabot, No 1, +52.
Or?rINUOUS SYSTEM CF MIMING UNSUITABLE FOR MANY DONBASS MINES
S. I. Perevyazko
Long use of the continuous system of mining in nearly all mines of the
Donbass, without taking into consideration seam stratification conditions, ia-
dicatPS that defects inherent in the system detract from its ;nerits to a con-
siderable extent. These defects have recently become particularly evident with
the introduction of new techniques and the cycle work schedule When heavy min-
ing machinery was first introduced, the continuous system of mining did play an
important part In the quick development of the mining front and in the increase
of the coal output of Donbass mines. However, in many cases, it now acts as a
brake on the effective exploitation of new machines and the increase of labor
productivity in exploitation.
TL most serious defect in the continuous system is the advancing method
of working sections and mine fields, since by this method, passages are neces-
srrily located in the worked-out area. This brings about the following results:
poor condition of development workings, combined with very high cost in main-
taining them; difficult operating conditions for underground transport because
of the unsatisfactory condition of haulage passages; ill-timed and laborious de-
livery of timber to the mine face, from below to above; considerable leakages of
air through the worked-out area and poor ventilation of the faces; wide disper-
sion of mining operations and, in this connection, a long stretch of workings to
be maintained.
Another great defect in the continuous system of mining is the absence of
preliminary deveopment of the line of the face, as a result of which work on
cutting haulage passages and os direct removal of the deposit is combined in
one exploitation section. Tits turns the loading point at the face into a bot-
tleneck in the work of the section, since it is a concentration point for load-
ing coal from the face, unloading mine timbers and delivering them to the face,
delivering empty cars to the face, and hauling coal and rock from the face. The
passage is blocked up by the location of the ventilator, ventilating ducts,
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starting apparatus, and necessa?; supplies of timber, all in the passage near
the face. All this complicates arrangements for the arrival of empty cars be-
neath the face and at the development front, and results in idleness of machines
a- the face.
In Donbass mines, there are instances where the condition of the workings
has been improved and the costs of maintaining t..zm have been lowered, in spite
of tote fact that the continuous method was used. However, these are few in num-
ber and,besides, the cost reduction in maintaining workings is so insignificant
that it would be absolutely wrong to conclude, on this basis, that the problem
of propping passages in the continuous system of mining is solved. Experience
in the Donbass shows that, up to the present, no prevailing type of prop exists
which can assure the stability of passages without the installation of extra
props in the irregular pressure zone of the wall rock. Such a method of prop-
ping.still remains a problem.
It is necessary to assure the stability of the haulage and ventilation pass-
ages first of all by using systems of working he deposit and of developing sec-
tions and mine fields which will exclude the need of maintenance of workings in
the irregular pressure zone of the wall rock, and will also permit a consider-
able decrease in the amount of workings maintained and in the dispersion of ey
ploitation sections. In this case, existing types of metal props and reinforced-
concrete props can assure long stability of paczages without extra props in the
irregular pressure zone. This is impossible to achieve by using the continuous
method.
Universal use of the continuous method of mining is certainly wrong. In
the Donbass, it is expedient to use both the continuous method and the long pil-
lar method, that is, both advancing and retreat mining, taking into considera-
tion, in choosing the system, not only the thickness of the seam but also the
behavior of the wall rock of the given seam.
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Approved for Release 2011/10/06: CIA-RDP80-00809A000700060113-8