Failure Mechanics Of Joined Rock Mass
Author(s)
J. Vacek & S. Sedláčková
Abstract
Failure of rock mass is not a static process, but has its own history. Its duration
varies from several seconds to several hundreds years. Rock mass movements
are often hundreds of metres and significantly change its original shape. Failure
mechanics can be studied experimentally. On nonhomogeneous models we can
observe the onset of failure (prior to and during the failure deformations increase
on sliding surfaces), the chronology of various stages of failure (cave-ins, slides),
and the final shape of rock mass. We can also observe influences, exerted by
modelled joints, adits and other features, upon the failure history and shapes of
cave-ins and slides.
Methods used for the study of geotechnical problems are based on two
presumptions:
•results must be time dependent
•results must allow the creation of joints in the rock mass before the
study event and during the event must allow movement of rock along
the joints, opening of the joints and creation of new joints. The direction
of modelled joints must be similar to reality, i.e. their direction and
inclination must be the same as in real-life. These measures make it
possible to create the structure of modelled rock mass similar to real
ones. The filling of cracks must be equivalent to real ones.
As a basic method of study of the geotechnical problems of caving and rock
pillar with adit and joints, scale physical models were used from equivalent
materials. Slips and bumps were also studied mathematically.
The solution must allow an extrusion of rock into an open space (for bump
study only).
Keywords: mining, rock mechanics, mathematics and physical modelling, joints,
rock pillar, cave-in, rock burst, bump.
Keywords
mining, rock mechanics, mathematics and physical modelling, joints,
rock pillar, cave-in, rock burst, bump.
Related Book
Other papers in this volume
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