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The Post-peak Failure Properties and Deformational Structures of Rocks... |
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The Post-peak Failure Properties and Deformational Structures of Rocks under Conventional Triaxial CompressionConditions Authors: M. Bukowska, U. Sanetra, M. Wadas
This paper presents the results of conventional triaxial compression tests conducted on samples of
the Carboniferous and Triassic sandstones. The test results related to the Carboniferous sandstones from
the Upper Silesian Coal Basin have been obtained for strain rates and confi ning pressures ranging from
10–5 s–1 to 10–1 s–1 and from 0 MPa to 70 MPa, respectively. The authors paid particular attention to the
post-peak failure modulus, as it is the parameter which is most diffi cult to determine from the post-peak
branch of the stress-strain curve obtained in a series of triaxial tests. Furthermore, a method is presented
that has been designed to study microscopic deformational structures under conditions of high confi ning
pressures of the order of 200 MPa to 300 MPa and the progressive axial shortening of the specimens
ranging from 5% to 15%. The method makes it possible to determine the orientation of the microscopic
fractures and cracks in rocks as a function of the distance from the macroscopic sliding surface. |
2011