Journals →  Gornyi Zhurnal →  2013 →  #4 →  Back

PHYSICS AND MECHANICS OF ROCKS
ArticleName Methods for determination of improved earthquakes intensity for the pit edges stability assessment
ArticleAuthor Tsirel S. V., Pavlovich A. A., Gaponov Yu. S.
ArticleAuthorData

National Mineral Resources University (Saint Petersburg, Russia):

Tsirel S. V., Senior Researcher, Doctor of Engineering Sciences, e-mail: tsirel58@gmail.com

Pavlovich A. A., Post-graduate Student

 

«Gipronickel» Institute» LLC (Saint Petersburg, Russia):

Gaponov Yu. S., Engineer

Abstract

Significant errors in assessment of expected seismic forces during the calculations of the pit edges stability are caused by the following factors:
-usage of integral values of earthquakes intensity, based on the set of general seismic zoning plans OSR-97 (ОСР-97);
-neglect of the standing term of pit edge.
According to this, it is necessary to use the differentiated approach during the assessment of seismic forces for a particular pit. This approach takes into account more exact (fractional) values of earthquakes intensity, based on the seismic microzoning. Allowable risk value and lifecycle of construction are also considered by this approach. The suggested methods are based on the determination of the lifecycle of pit edge, with application of the Taylor formula. This formula demonstrates the dependence of the time of pit development both from the amount of mineral reserves, and from the assessments of rate of open pit sinking in different directions, taking into account the differences in the slope angles of edges in operating and limiting positions. Seismic microzoning and assessments of probability of different intensity earthquakes, suggested by V. I. Ulomov, are used for the purpose of assessment of expected earthquake intensity in the place of pit location during the edges standing in the limiting position. In the absence of seismic microzoning, there is used the dual (temporal and spatial) linear interpolation, based on the A and B maps of the set of general seismic zoning plans OSR-97 (ОСР-97). This article presents the examples of calculations, made for Chernigovsky and Bachatsky coal pits in the territory of Kuznetsk Basin. These calculations show, that without the foregoing corrections, the error in detection of maximal earthquake accelerations can be 10-15% and higher.

keywords Seismic transients intensity, standing term of pit edges, earthquake forces, set of general seismic zoning plans OSR-97 (ОСР-97), open-cut development of deposit
References

1. Ulomov V. I., Shumilina L. S. Komplekt kart obshchego seysmicheskogo rayonirovaniya territorii Rossiyskoy Federatsii - OSR-97. Masshtab 1:8 000 000. Obyasnitelnaya zapiska i spisok gorodov i naselennykh punktov, raspolozhennykh v seysmoopasnykh rayonakh (Set of general seismic zoning plans of the territory of Russian Federation - OSR-97. Scale 1:8 000 000. Explanatory note and list of cities, towns and settlements, located in the earthquake-prone regions). Moscow, 1999, 57 p.
2. SNiP II-7-81. Stroitelstvo v seysmicheskikh rayonakh. Redaktsiya ot 27.12.1999 (Sanitary rules and regulations II-7-81. Construction in seismic regions. Edition since December 27, 1999). Moscow: Russian Federation State Committee for Construction, 2000.
3. Metodicheskie rekomendatsii po geologo-ekonomicheskomu obosnovaniyu konditsiy dlya podscheta zapasov mestorozhdeniy tverdykh poleznykh iskopaemykh (krome uglya i goryuchikh slantsev) (Methodical recommendations on geological and economic explanation of standards for calculation of reserves of deposits of solid minerals (except coal and oil shales)). Moscow : State Reserves Committee under the Russian Federation Ministry of Natural Resources, 1999, 75 p.
4. Zvonarev N. K. Obosnovanie velichiny koeffitsienta zapasa pri raschetakh ustoychivosti bortov karerov. Avtoreferat dissertatsii….kandidata tekhnicheskikh nauk (Substantiation of the value of yield factor during the calculations of the pit edges stability. Thesis of inauguration of Dissertation....of Candidate of Engineering Sciences). Leningrad : Leningrad State University, 1964, 21 p.
5. Available at: http://eearth.wdcb.ru/shake-2.htm (accessed: March 07, 2013).
6. Ulomov V. I. Georisk – Geological risk, 2009, No. 3, pp. 16–19.
7. Aptikaev F. F. Bezopasnost sooruzheniy – Safety of constructions, 2005, No. 5, pp. 33–37.

Language of full-text russian
Full content Buy
Back