Zairov Sh. Sh., Normatova M. Zh. – Navoiy State Mining Institute, Navoiy, Republic of Uzbekistan.
Е-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Construction of blasthole charges of explosives under smoothwall blasting is developed and tested; it allows getting
stable slopes of 20 m long benches with slope angle 60°. It avoids the need for additional walls cutback and increases
the security of works at underlying levels. The efficient parameters of contour blasting which have been developed
provided the creation of the widest screening crack under the given limit of interblock connections ruptured zone power
in a near-slope part of a massif. In order to increase the stability of benches slopes at smoothwall blasting it is necessary
76 «Известия вузов. Горный журнал», № 2, 2017 ISSN 0536-1028
to estimate relative power reduction of a zone with ruptured interblock connection in a near-slope part of a massif.
On the basis of the given statements the coefficient of smoothwall blasting efficiency is found for opencast mining.
The investigations have determined that the efficiency of smoothwall blasting increases with the reduction of the massif
with natural and artificial rock jointing weakening.

Key words: drilling and blasting operations; charge construction; smoothwall blasting; benches slopes stability; walls
cutback; screening crack; blockiness; rock jointing.

REFERENCES
1. Norov Iu. D., Zairov Sh. Sh., Nutfullaev G. S. [Blasting operations development at smoothwall blasting in flooded
rocks at open pits]. Innovatsionnye tekhnologii gorno-metallurgicheskoi otrasli: mater. nauch.-prakt. konf. (21 oktiabria
2011 g.) [Proc. Sci.-to-Pract. Conf. “Innovative technologies of mining-metallurgical branch” (21st October 2011)].
Navoiy, 2011, pp. 59–61. (In Russ.)
2. Norov Iu. D., Zairov Sh. Sh. Metodika issledovaniia deistviia vzryva okonturivaiushchikh skvazhinnykh zariadov
vzryvchatykh veshchestv v prikonturnoi zone kar'era [The methodology of studying the action of explosion of delineating
blasthole charges at the marginal zone of an open pit]. Navoiy, NSMI Publ., 2015. 50 p.
3. Bibik I. P., Rubtsov S. K., Sytenkov D. V. Upravlenie vzryvnoi podgotovkoi porod v tekhnologicheskikh potokakh
kar'erov [Control over rock blasting development at workflows of open pits]. Tashkent, Fan Publ., 2008. 399 p.
4. Graur M. I. Upravlenie protsessom razrusheniia porod pri konturnom vzryvanii s tsel'iu polucheniia ustoichivykh
otkosov ustupov na kar'erakh: dis. … kand. tekhn. nauk [Control over the process of rock breaking at smoothwall
blasting with the purpose of getting benches slopes at open pits. Cand. eng. sci. diss.]. Moscow, 1981. 153 p.

Solov'ev V. A., Aptukov V. N. – Ural Research and Design Institute for Mineral Salt Production JSC, Perm, the Russian
Federation. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Kotliar E. K. – Uralkali PJSC, Berezniki, the Russian Federation. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
At Verkhnekamskoye deposit of potassium salts 16 shafts are exploited and 9 shafts are on the level of design and
construction. In the salt part of a vertical section exploited shafts are strengthened with cast iron liners or site concrete.
Not a single type of support can provide guaranteed safety of a mine working; if challenging conditions arise the support
crashes and a need arises to carry out complex repair works. Pliant layers, situated between rock mass and support have
come into operation as prevention measures under the construction of shafts at potassium deposits. According to
the results of testing five types of polystyrene foam, “Penopleks-krovlia” (“Penopleks-35”) polystyrene foam has come to
be used as a protective layer. At calculation with the use of the licensed software complex ANSYS 17.0 the fields of
horizontal displacement and circular stress have been detected. Time dependencies of pressure on concrete support
have been detected, together with circular stresses within concrete support, and degrees of shrinkage of pliable layer 0.3
and 0.4 m deep. Validity check has been performed of calculation model and the results of full-scale experiment on
straining in the course of time for the shaft no. 3 of a mine of the Third Solikamsk Potassium Mine Group.

Key words: salt rocks; carnallite rocks; shafts; concrete support with pliable layer; polystyrene foam; model validity.

REFERENCES
1. Soloviev V. A., Aptukov V. N. [Assessment of the effect of compression properties of deformation layers and
parameters of combined support on the stability of shafts in salt rocks]. Izvestiya vysshikh uchebnykh zavedenii. Gornyi
zhurnal – News of the Higher Institutions. Mining Journal, 2014, no. 7, pp. 43–47. (In Russ.)
2. Solov'ev V. A., Aptukov V. N., Kotliar E. K. [Geomechanical and technological aspects of developing shaft
constructions in salt rocks]. Gornyi zhurnal – Mining Journal, 2015, no. 11, pp. 24–28. (In Russ.)

Zharikov S. N. – The Institute of Mining of the Ural Branch of RAS, Ekaterinburg, the Russian Federation.
E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

The article introduces results of interrelations investigation of energy characteristics of roller-bit drilling and blasting
destruction of rocks. It is shown that the account of production wells drilling process parameters makes it possible to
simulate changes in strength characteristics of rocks in mine blocks and refine the parameters of blasthole charges of
explosives. The introduced results of interrelations investigation of roller-bit drilling and blasting destruction of rocks prove
that rocks properties refinement at drilling and blasting operations has high scientific and practical significance.

Key words: physical and mechanical properties of rocks; roller-bit drilling; drilling and blasting operations; blast; drilling and
blasting parameters.

REFERENCES
1. Trubetskoi K. N., Zakharov V. N., Viktorov S. D., Zharikov I. F., Zakalinskii V. M. [Blasting destruction of rock
massifs at bowels exploitation]. Problemy nedropol'zovaniia – The Problems of Subsoil Use, 2014, no. 3, pp. 80–95.
(In Russ.)
2. Trubetskoi K. N., Kornilkov S. V., Iakovlev V. L. [Regarding the new approaches to mining stable development
support]. Gornyi zhurnal – Mining Journal, 2012, no. 1, pp. 15–19. (In Russ.)
3. Trubetskoi K. N., Kaplunov D. R., Ryl'nikova M. V. [Problems and further development of resource-saving and
resource-reproducing geotechnologies of complex bowels development]. Fiziko-tekhnicheskie problemy razrabotki
poleznykh iskopaemykh – Physical and Technical Problems of Mining, 2012, no. 4, pp. 116–124. (In Russ.)
4. Tangaev I. A. Energetika protsessov i sistem otkrytykh gornykh rabot i rudopodgotovki: ucheb.-metod. posobie
[School book “Energetics of processes and systems of opencast mining and ore processing”]. Bishkek, Moscow, Izd-vo
Kyrgyz Russian Slavic University Publ., 2002. 52 p.
5. Zharikov S. N., Shemenev V. G. [Methodology of estimating output ratio of workflows in “drilling and blasting
crushing–mechanical crushing–grinding” cycle at opencast mining of ore deposits]. Gornyi zhurnal – Mining Journal,
2013, no. 10, pp. 83–85. (In Russ.)
6. Fizika vzryva. Pod red. L. P. Orlenko. V 2 t. [Explosion physics. Edited by L. P. Orlenko. In 2 vol.]. Moscow,
FIZMATLIT Publ., 2004. Vol. 1. 832 p. Vol. 2. 656 p.
7. Kuk M. A. Nauka o promyshlennykh vzryvchatykh veshchestvakh: per. s angl. Pod red. G. P. Demidiuka i N. S.
Bakharevich [Science of industrial explosives: transl. from English. Edited by G. P. Demidiuk and N. S. Bakharevich].
Moscow, Nedra Publ., 1980. 453 p.
8. Tangaev I. A. Burimost' i vzryvaemost' gornykh porod [Drilling capacity and blastability of rocks]. Moscow, Nedra
Publ., 1978. 184 p.
9. Tangaev I. A. Energoemkost' protsessov dobychi i pererabotki poleznykh iskopaemykh [Energy content of production
processes and processing of minerals]. Moscow, Nedra Publ., 1986. 231 p.
10. Zharikov S. N. [Energies of rock destruction at roller-bit drilling and blasting at open pits]. Nauchno-tekhnicheskoe
obespechenie gornogo proizvodstva: tr. IGD im. D. A. Kunaeva. [Collected works of IM named after D. A. Kunaev
“Scientific and engineering support of mining industry”]. Almaty, 2009, vol. 77. pp. 91–96. (In Russ.)
11. Zharikov S. N. Vzaimosviaz' udel'nykh energeticheskikh kharakteristik protsessov sharoshechnogo bureniia i
vzryvnogo razrusheniia massiva gornykh porod: dis. … kand. tekhn. nauk [Interrelation of specific energetic
characteristics of roller-bit drilling processes and blasting destruction of rocks. Cand. eng. sci. diss.]. Ekaterinburg,
IM UB RAS Publ., 2011. 139 p.

Latyshev O. G., Frants V. V., Prishchepa D. V. – The Ural State Mining University, Ekaterinburg, the Russian
Federation. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Rock breaking in a mine working in the presence of developed fissure system happens, as a rule, due to the shift along
the surface of weakness. Experimental investigation of the given process is complicated by a high labor intensity of fullscale
experiments and impossibility of multiple shears along one and the same fissure. In this conditions imitational
modeling of the process with the method of Monte-Carlo is an efficient means of investigation. For its realization
the establishment of quantitative relations is required, which define the character of rock deformation before and after the
achievement of ultimate shearing stress at the shear. On the basis of experimental investigations the present work
determines the equations of ascending and descending branches of stress-strain curve. The equation of shear rigidity of
fissures on the basis of the fractal dimension of its trajectory is obtained. Estimation procedure of remaining strength at
rock shear along the fissure is substantiated. Model validity check by way of comparing the results of its realization with
experimental data has shown their statistically reliable correspondence within the accuracy of observations.
The application of the developed model allows investigating regularities of shear along the fissure process for various
rocks and conditions. Averaging of multiple realizations of a model increases the reliability of received date.

Key words: rocks; shear along the fissure; modeling; fractal analysis.

REFERENCES
1. Sobol' I. M. Metod Monte-Karlo [Monte-Carlo method]. Moscow, Nauka Publ., 1978. 64 p.
2. Barton N. R., Bandis S. C. Effect of block size on the shear behavior of jointed rock. 23rd U.S. Symp. on Rock
Mechanics. Berkeley, 1982, pp. 739–760.
3. Rechitskii V. I., Erlikhman S. A. [Modern methods of shearing strength along the fissure determination].
Geoekologiia – Geoecology, 1997, no. 5, pp. 102–114. (In Russ.)
4. Latyshev O. G., Frants V. V., Prishchepa D. V. [Fractal dimension of a fissure as a measure of roughness]. Izvestiya
vysshikh uchebnykh zavedenii. Gornyi zhurnal – News of the Higher Institutions. Mining Journal, 2015, no. 8,
pp. 55–60. (In Russ.)
5. Latyshev O. G., Prishchepa D. V. [The forecast of deformational characteristics of jointed rock massif]. Izvestiya
vysshikh uchebnykh zavedenii. Gornyi zhurnal – News of the Higher Institutions. Mining Journal, 2017, no. 1,
pp. 80–85. (In Russ.)
6. Latyshev O. G. Razrushenie gornykh porod [Rock break up]. Moscow, Teplotekhnik Publ., 2007. 672 p.
7. Rechitskii V. I. [Results of experimental investigations of fissure rigidity in hard rocks]. Geoekologiia – Geoecology,
1998, no. 2, pp. 88–99. (In Russ.)