NDLI: Relationship Between Pre-failure and Post-failure Mechanical Properties of Rock Material of Different Origin

Content Provider	Springer Nature Link
Author	Tutluoğlu, Levent Öge, İbrahim Ferid Karpuz, Celal
Copyright Year	2014
Abstract	Under compression, gathering data related to the post-failure part of the stress–strain curve requires stiff servo-controlled testing systems. In unconfined conditions, data related to the post-peak region of the intact rock parameters are not common as pre-peak and peak state parameters of stress–strain behavior. For problems involving rock in the failed state around structures, proper choice of plastic constitutive laws and post-failure parameters is important for the modeling of the failed state. The aim is to relate commonly used intact rock parameters of pre-failure (tangent modulus E i and secant modulus E s) and peak strength (σ ci) states to parameters of the post-failure state under unconfined compression. Post-failure parameters are the drop modulus (D pf), representing the slope of the falling portion in brittle state, residual strength (σ cr), and dilatancy angle (ψ°). Complete stress–strain curves were generated for various intact rock of different origin. Seventy-three post-failure tests were conducted. Samples included in the testing program were chosen to represent rocks of different origin. Specimens of granite, rhyodacite, dunite, quartzite series, glauberite, argillite, marl, and lignite were used in the tests. The results from the pre-failure and peak state testing parts were processed and compared to the post-failure stress–strain parameters. For the estimation of post-failure parameters in terms of the pre-peak and peak states, the functional relations were assessed. It was found that the drop modulus D pf increases with rock strength σ ci, following a power function with an approximate power of two. With an exponential trend, the D pf/E s ratio increases with decreasing E i/σ ci ratio. Relations estimating the residual strength and dilatancy from the pre-peak and peak state parameters are in logarithmic and exponential functional forms, respectively.
Starting Page	121
Ending Page	141
Page Count	21
File Format	PDF
ISSN	07232632
Journal	Rock Mechanics and Rock Engineering
Volume Number	48
Issue Number	1
e-ISSN	1434453X
Language	English
Publisher	Springer Vienna
Publisher Date	2014-02-12
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Rock deformability Rock strength Post-failure Stress–strain curve Brittle state Dilation Geophysics/Geodesy Civil Engineering
Content Type	Text
Resource Type	Article
Subject	Geology Geotechnical Engineering and Engineering Geology Civil and Structural Engineering

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