DBPapers
DOI: 10.5593/sgem2012/s03.v1050

RHEOLOGICAL PARAMETERS OF THE DIFFERENT TYPES OF SANDSTONES FROM JIU VALLEY BASIN

M. TODERAS 
Wednesday 1 August 2012 by Libadmin2012

References: 12th International Multidisciplinary Scientific GeoConference, www.sgem.org, SGEM2012 Conference Proceedings/ ISSN 1314-2704, June 17-23, 2012, Vol. 1, 777 - 784 pp

ABSTRACT

The deposition of the Jiu Valley basin is made up of a succession of diversified seams
of variable thickness, which lend it a dense sedimentologic structure and thus, it can be
characterized geomechanically as being a rock mass of discontinuous non-homogeneity.
A large part of the main horizontal workings driven for first mining and development of
the deposit are unstable and in an unsatisfactory state, and shows an advanced state of
deformation. In order to improve the stability – reliability of these workings, based on
the concept of adaptative interaction between the support system and the rock mass it is
necessary to know the rheological behaviour of the rocks the mine workings are driven
in, the rheological parameters (creeping and relaxation) necessary to approach
interaction, i.e. the consideration of the elasto – plastic – viscous interaction type, taking
also into account the dilatation phenomenon. The paper presents the results obtained
referring to the behaviour to deformation in time of some sandstone varieties specific to
the Jiu Valley deposit. The interpretation of the experimental results obtained as a result
of creeping tests, with a view to establish the parameters and rheological coefficients of
the values taken into consideration, was done by means of the classical theory or of
differential equations and of the theory of hereditary or of integral equations.

Keywords: sandstone, creep, relaxation, r