Libmonster is the largest world open library, repository of author's heritage and archive

Register & start to create your original collection of articles, books, research, biographies, photographs, files. It's convenient and free. Click here to register as an author. Share with the world your works!
Libmonster ID: COM-492

Share this article with friends

Author: Nauka v Sibiri (Science in Siberia), 1999 Prepared by Emma SOLOMATINA

Since the latter half of the outgoing century there has been a turbulent growth in studies related to rock mechanics. Such studies deal with the strained (deformed) state of massifs in the outer crust of the earth where geological prospecting and mining is carried out. For decades rock mechanics as a discipline in its own right has been the domain of the Mining Institute of the Siberian Branch of the Russian Academy of Sciences. Dr. Kulakov, a laboratory head of this Institute, elaborates:

Rock mechanics is a theoretical basis of rock pressure which-as scientists both here and abroad had thought right until the 1960s-was caused by gravitational forces of the earth crust, i.e. by a mass of rock in the gravitational field of the earth. Way back in 1920s Academician Alexander Dinnik formulated a corresponding hypothesis: that vertical stresses exceeded horizontal ones in magnitude, and the latter were equipollent in all directions.

Proceeding from this assumption, geomechanics students ultimately came to the conclusion that the earth crust persisted in an equilibrium state, with gravitational forces being the sole cause of rock stresses. Even if stresses changed under the effect of some factors, they relaxed and leveled off with time. As a consequence, in the opinion of Academician Lev Shevyakov (1889-1963), "the area of stresses in an intact rock massif turns out to be simple enough". For years theoretical and practical studies had been based on such assumptions that were making their way into manuals and the literature.

Yet experimental studies of native rock massifs (studies that were gaining force in the 1960s) led to surprising discoveries: the horizontal components of stress proved as a rule higher than the vertical components and, in addition, not equipollent in various directions. High horizontal stresses, exceeding five- to tenfold the vertical ones, were registered in apatite mines on Kola Peninsula, and in the Tashtagol iron-ore deposit in the Mountain Shoriya. Then such phenomena were detected within the Kursk Magnetic Anomaly, at Norilsk and in the Trans-Baikal area, and also abroad: in South Africa, Scandinavia, the USA, Canada, Japan and China. The experimental evidence was thus at variance with the gravitational theory.

The new discoveries testified to a diversified pattern of stresses in native rock. The point is that the earth crust is always subject to shifts, or displacements owing to tidal waves in the lithosphere, tectonic movements of some of its areas, seismic processes, magmatic mass movements and changing temperature patterns. In fact, the earth crust operates

page 10


as a mechanical-dynamic system and, according to Arkady Leontyev, an authority in this field, is acted upon by different forces engendered by heterodromous (not unidirectional) global processes. All that leaves traces in the earth crust and its rock masses.

Forces accounting for a rise in horizontal stresses are brought to life by tectonic forces (Mikhail Gzovsky was the first to predict such a possibility back in 1954; however, thirteen years were to pass before the first experimental evidence could be obtained).

The detection of tectonic forces operating in certain sections of the earth crust has brought about a cardinal revision of the fundamentals of contemporary geomechanics and enabled a new approach to the problem of shocks. Yet it became clear: stresses caused by such forces cannot be computed, they have to be measured. While within the framework of the gravitational hypothesis the computation of starting (initial) stresses posed problems because of the heterogeneous properties of rock massifs, now yet another random factor has been added-that of tectonic stresses (thus far little is known about their nature).

The newly discovered natural geomechanical factor should be taken into account in mining works carried out within some active deposits, for tectonic stresses may be fairly high there. Clearly, the same is true of newly explored deposits-one cannot design a network of exploring openings or proving holes there without making a thorough study of local fields of stresses. That is why it is essential to develop other methods of prospecting and new equipment alike. Ever since the mid-1960s (when the first instrumental data were obtained on enhanced horizontal stresses) all these problems have been attacked by many R&D bodies of the former Soviet Union, including those in Kazakhstan and Georgia. In turn, the Research Institute of Mining (Siberian Branch of the USSR Academy of Sciences) back in the 1970s set up a laboratory of rock mechanics under Academician Mikhail Kurlenei, and in addition to the then operating laboratory of rock pressure headed by Corresponding Member of the USSR Academy of Sciences Timofei Gorbachev. This work is carried on: both old and new techniques are being developed for measuring stresses, deformations, and displacements, and for studying the physicochemical properties of rock.


© libmonster.com

Permanent link to this publication:

https://libmonster.com/m/articles/view/FROM-THE-GRAVITATIONAL-OVER-TO-TECTONIC-HYPOTHESIS

Similar publications: LRussia LWorld Y G


Publisher:

Libmonster OnlineContacts and other materials (articles, photo, files etc)

Author's official page at Libmonster: https://libmonster.com/Libmonster

Find other author's materials at: Libmonster (all the World)GoogleYandex

Permanent link for scientific papers (for citations):

FROM THE GRAVITATIONAL OVER TO TECTONIC HYPOTHESIS // London: Libmonster (LIBMONSTER.COM). Updated: 08.09.2018. URL: https://libmonster.com/m/articles/view/FROM-THE-GRAVITATIONAL-OVER-TO-TECTONIC-HYPOTHESIS (date of access: 06.12.2021).


Comments:



Reviews of professional authors
Order by: 
Per page: 
 
  • There are no comments yet
Related topics
Publisher
Libmonster Online
New-York, United States
215 views rating
08.09.2018 (1185 days ago)
0 subscribers
Rating
0 votes
Related Articles
ИСТОРИЯ АКАДЕМИЧЕСКОГО КНИГОИЗДАНИЯ В РОССИИ В ТРУДАХ П. П. ПЕКАРСКОГО
Catalog: Science 
4 days ago · From Libmonster Online
UKRAINIAN-US RELATIONS: THE KEY ROLE OF NATIONAL INTEREST
Catalog: Political science 
4 days ago · From Libmonster Online
INTER-OCEAN CONVEYOR
Catalog: Other 
35 days ago · From Libmonster Online
INFINITE ROLE OF INFINITESIMAL
Catalog: Biotechnology 
35 days ago · From Libmonster Online
NEAR-EARTH ASTRONOMY
Catalog: Astronomy 
66 days ago · From Libmonster Online
"FATHER" OF THE HYDROGEN BOMB
Catalog: Physics 
76 days ago · From Libmonster Online
"AT THE BEGINNING WAS THE WORD..."
Catalog: Library science 
80 days ago · From Libmonster Online
MARS: EVER CLOSER
Catalog: Astronomy 
80 days ago · From Libmonster Online
X-RAY SPECTROSCOPY OF THE SUN
Catalog: Astronomy 
80 days ago · From Libmonster Online
VACUUM LABORATORIES IN OUTER SPACE
Catalog: Science 
98 days ago · From Libmonster Online


Actual publications:

Latest ARTICLES:

Libmonster is the largest world open library, repository of author's heritage and archive

Register & start to create your original collection of articles, books, research, biographies, photographs, files. It's convenient and free. Click here to register as an author. Share with the world your works!
FROM THE GRAVITATIONAL OVER TO TECTONIC HYPOTHESIS
 

Contacts
Watch out for new publications:

About · News · For Advertisers · Donate to Libmonster

Libmonster ® All rights reserved.
2014-2021, LIBMONSTER.COM is a part of Libmonster, international library network (open map)
Keeping the heritage of Ukraine


LIBMONSTER NETWORK ONE WORLD - ONE LIBRARY

US-Great Britain Sweden Serbia
Russia Belarus Ukraine Kazakhstan Moldova Tajikistan Estonia Russia-2 Belarus-2

Create and store your author's collection at Libmonster: articles, books, studies. Libmonster will spread your heritage all over the world (through a network of branches, partner libraries, search engines, social networks). You will be able to share a link to your profile with colleagues, students, readers and other interested parties, in order to acquaint them with your copyright heritage. After registration at your disposal - more than 100 tools for creating your own author's collection. It is free: it was, it is and always will be.

Download app for smartphones