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PHYSICS OF ROCKS AND PROCESSES
ArticleName Challenges and advancement in geomechanical justification of pit wall designs
DOI 10.17580/gzh.2017.07.07
ArticleAuthor Tsirel S. V., Pavlovich A. A.
ArticleAuthorData

Research Center for Geomechanics and Mining Issues, Saint-Petersburg Mining University, Saint-Petersburg, Russia:

S. V. Tsirel, Senior Researcher, Doctor of Engineering Sciences, tsirel58@mail.ru
A. A. Pavlovich, Head of laboratory, Candidate of Engineering Sciences

Abstract

The article discusses pit wall stability calculation techniques. It is shown that limit equilibrium method and mathematical modeling address different ways of slope stability loss, and calculation results may sometime appreciably differ (especially in rock masses having a complex structure). The authors analyze the kinematic analysis approaches to slope stability in permafrost. The emphasis is laid on the method to select the required value of the safety factor depending on various concurrents, including essentially different estimates of allowable risk for people and equipment. It is suggested to account for both determinate time of pit wall life and stochastic components governed by the degree of knowledge on the structure and properties of the pit wall rock mass, errors of patterns of calculation, variability of rock properties etc. A detailed discussion is devoted to the development of a regulatory document on determination of slopes for pit walls and dumps in open pit mines under planning and in operation, and to the information contents of this document. It is proposed that the new regulations are composed of three basic parts – general requirements to studying and estimating pit wall parameters; calculation standards; and calculation rules for the transition stage when calculations performed in accordance with the old codes are checking but not unique. Furthermore, the article points at the need to correct the rules of observation over state of pit walls and dumps using the modern tolls of the deformation, hydrogeomechanical and geophysical monitoring.

keywords Pit wall stability, numerical modeling, limit equilibrium method, kinematic analysis, safety factor, failure criterion, risk, reliability, regulatory document
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