On the influence of deformation mechanisms of different scales on regularities of response of shear fault zones under nonequiaxal compression loading
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Інститут геофізики ім. С.I. Субботіна НАН України
2010
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| Zitieren: | On the influence of deformation mechanisms of different scales on regularities of response of shear fault zones under nonequiaxal compression loading / S. Astafurov, E. Shilko, V. Sergeev, A. Panchenko, S. Psakhie // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 7-8. — рос. |
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irk-123456789-1011892016-06-01T03:03:07Z On the influence of deformation mechanisms of different scales on regularities of response of shear fault zones under nonequiaxal compression loading Astafurov, S. Shilko, E. Sergeev, V. Panchenko, A. Psakhie, S. 2010 Article On the influence of deformation mechanisms of different scales on regularities of response of shear fault zones under nonequiaxal compression loading / S. Astafurov, E. Shilko, V. Sergeev, A. Panchenko, S. Psakhie // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 7-8. — рос. 0203-3100 http://dspace.nbuv.gov.ua/handle/123456789/101189 ru Геофизический журнал Інститут геофізики ім. С.I. Субботіна НАН України |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine |
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DSpace DC |
| language |
Russian |
| format |
Article |
| author |
Astafurov, S. Shilko, E. Sergeev, V. Panchenko, A. Psakhie, S. |
| spellingShingle |
Astafurov, S. Shilko, E. Sergeev, V. Panchenko, A. Psakhie, S. On the influence of deformation mechanisms of different scales on regularities of response of shear fault zones under nonequiaxal compression loading Геофизический журнал |
| author_facet |
Astafurov, S. Shilko, E. Sergeev, V. Panchenko, A. Psakhie, S. |
| author_sort |
Astafurov, S. |
| title |
On the influence of deformation mechanisms of different scales on regularities of response of shear fault zones under nonequiaxal compression loading |
| title_short |
On the influence of deformation mechanisms of different scales on regularities of response of shear fault zones under nonequiaxal compression loading |
| title_full |
On the influence of deformation mechanisms of different scales on regularities of response of shear fault zones under nonequiaxal compression loading |
| title_fullStr |
On the influence of deformation mechanisms of different scales on regularities of response of shear fault zones under nonequiaxal compression loading |
| title_full_unstemmed |
On the influence of deformation mechanisms of different scales on regularities of response of shear fault zones under nonequiaxal compression loading |
| title_sort |
on the influence of deformation mechanisms of different scales on regularities of response of shear fault zones under nonequiaxal compression loading |
| publisher |
Інститут геофізики ім. С.I. Субботіна НАН України |
| publishDate |
2010 |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/101189 |
| citation_txt |
On the influence of deformation mechanisms of different scales on regularities of response of shear fault zones under nonequiaxal compression loading / S. Astafurov, E. Shilko, V. Sergeev, A. Panchenko, S. Psakhie // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 7-8. — рос. |
| series |
Геофизический журнал |
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2025-07-07T10:34:05Z |
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On the influence of deformation mechanisms of different
scales on regularities of response of shear fault zones under
nonequiaxal compression loading
S. Astafurov, E. Shilko, V. Sergeev, A. Panchenko, S. Psakhie, 2010
Institute of Strength Physics and Materials Sciences, SB RAS, Tomsk, Russia
astaf@ispms.tsc.ru
Introduction. It is well known that stress state
of geological media is nonuniform and complex and
one of its main features are constrained conditions.
Degree of constraint, determined through a value of
applied stresses, greatly influences on deformation
mechanisms and fracture regime of the medium.
Significant parts of massifs, are in complex con-
ditions, which could be characterized by the scheme
"shear+compression". So, deformation of shearing
fault zones takes place under nonequiaxial com-
pression conditions. In this current study is the in-
fluence of relationship of normal and lateral pres-
sures on the character of deformation and fracture
of the geological medium under shear loading. An
important feature of the structure of geological me-
dia is a multiscale hierarchical organization of the
block structure. The structural blocks separated by
a "surface relaxations", characterized by lower ef-
fective strength in comparison with the material
blocks itself. This helps to alleviate the slipping along
interblock interfaces and thus leads to occurrence
of large number of additional degrees of freedom
(mobility) fragments of the medium. Therefore it is
important to analyze the role of the block structure
of the medium, in particular, the processes of for-
mation of discontinuities and cracks growth at the
interfaces of structural elements. This paper is de-
voted to the theoretical investigation of the effect of
this factor on the deformation parameters, shear
strength and other characteristics of the response
of block-structured medium under constrained shear
loading conditions. The study was carried out on
the base of computer-aided simulation by movable
cellular automaton method.
In this paper, regularities of response of block-
structured media under shear deformation were stu-
died on the example of system with blocks of the
same size, separated by interfaces. Analogue in-
terblock interfaces constituted zones with reduced
strength and deformation characteristics. It promotes
the localization and accumulation of irreversible
strains on them. Note that in the case of a real geo-
logical medium these features are determined by
highest content in the interface zones (in com-
parison with the blocks) of damages, porosity, etc.
This model of block-structured medium was realized
in the framework of two-dimensional version of the
movable cellular automaton method. For the mathe-
matical description of the elastic-plastic response
of the blocks and the interfaces applied the model
described in, in approximation, a similar to plain-
stress state approximation. For automata that si-
mulate the blocks linear response function was
used. Response functions of automata that simu-
late the interfaces were characterized by a long
section, corresponding to the accumulation of irre-
versible deformation. Initial stress state of the sam-
ple set by nonequiaxial compression by forces. Con-
strained specimen was subjected to a shear defor-
mation with a small constant velocity. Degree of
nonequiaxiality of compression of the specimen was
characterized by the dimensionless parameter,
which is defined as the ratio of the relative values of
compresses in the horizontal direction force to a
specific value of the vertical compressive force. This
parameter characterizes the relative magnitude of com-
pression of the system in the direction of shear.
The results of the theoretical investigation of the
general regularities of behavior of block-structured,
including geology, media in conditions of shear de-
formation have shown that an important factor in
determining the relative contribution of different de-
formation mechanisms in the integrated mechanical
response of the block system is the degree of no-
nequiaxiality of compression of the specimen. Thus,
the increase in compressive stress in the direction
of application of shear loading leads to reducing of
contribution of deformation mechanisms of low scale
levels, leading to the accumulation of irreversible
deformation in the interblock interface areas. The
reason for this is increasing of the degree of degra-
dation of medium in the initial stress-strain state,
/#�)-(% '0%.�+,#(� #(%1
which leads to rapid formation of discontinuities in
the most weak interfaces in the process of shear
deformation. At high degrees of constraint forma-
tion of these "mesoscopic" flaws and their associa-
tion into interblock cracks become the dominant
deformation mechanism in the block-structured
medium. Changing of the dominant mechanism of
deformation is manifested as a change of the trend
and in some cases of the sign of the integral cha-
racteristics of the deformation response of the me-
dium, such as shear strength, the ultimate value of
shear strain and changing of the width of shearing
zone. In general, results suggest the possibility of
introducing of some dimensionless parameter cha-
racterizing regime of the mechanical response of
the medium during shear deformation. This param-
eter should be a function which links the applied
stresses and rheological characteristics of the me-
dium (in particular, the elastic limit of the material
of interblock interfaces).
This work was supported by grant of the Presi-
dent of Russian Federation (MK-130.2010.5), RFBR
grant ��09-05-00968-a and project of program of
the Presidium of RAS 16.8.
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