Strength and dilatancy of jointed rocks with granular fill |
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| Authors: | Ashutosh Trivedi |
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| Institution: | (1) Department of Civil Engineering, Faculty of Technology (FoT), University of Delhi, Delhi College of Engineering Campus, Bawana Road, House No. 8, Type V, Delhi, 110042, India;(2) Delhi College of Engineering, Faculty of Technology (FoT), University of Delhi, House No. 8, Type V, Delhi College of Engineering, Bawana Road, Delhi, 110042, India |
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| Abstract: | It is well recognised that the strength of rock masses depends upon the strain history, extent of discontinuities, orientation
of plane of weakness, condition of joints, fill material in closely packed joints and extent of confinement. Several solutions
are available for strength of jointed rock mass with a set of discontinuities. There is a great multiplicity in the proposed
relationships for the strength of jointed rocks. In the present study, the author conceives the effect of increasing stresses
to induce permanent strains. This permanent strain appears as micro crack, macro crack and fracture. A fully developed network
of permanent deformations forms joint. The joint may contain deposits of hydraulic and hydrothermal origin commonly known
as gouge. The joint factor numerically captures varied engineering possibilities of joints in a rock mass. The joints grow
as an effect of loading. The growth of the joints is progressive in nature. It increases the joint factor, which modifies
the failure stresses. The dilatancy explains the progressive failure of granular media. Hence, a mutual relationship conjoins
effectively the strength of jointed rock and a dilatancy-dependent parameter known as relative dilatancy. This study provides
a simple and integral solution for strength of jointed rocks, interpreted in relation to the commonly used soil, and rock
parameters, used for a realistic design of structure on rock masses. It has scope for prediction of an equivalent strength
for tri-axial and plane strain conditions for unconfined and confined rock masses using a simple technique. |
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