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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 30465


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10009414
Numerical Modeling of Determination of in situ Rock Mass Deformation Modulus Using the Plate Load Test
Abstract:
Accurate determination of rock mass deformation modulus, as an important design parameter, is one of the most controversial issues in most engineering projects. A 3D numerical model of standard plate load test (PLT) using the FLAC3D code was carried to investigate the mechanism governing the test process. Five objectives were the focus of this study. The first goal was to employ 3D modeling in the interpretation of PLT conducted at the Bazoft dam site, Iran. The second objective was to investigate the effect of displacements measuring depth from the loading plates on the calculated moduli. The magnitude of rock mass deformation modulus calculated from PLT depends on anchor depth, and in practice, this may be a cause of error in the selection of realistic deformation modulus for the rock mass. The third goal of the study was to investigate the effect of testing plate diameter on the calculated modulus. Moreover, a comparison of the calculated modulus from ISRM formula, numerical modeling and calculated modulus from the actual PLT carried out at right abutment of the Bazoft dam site was another objective of the study. Finally, the effect of plastic strains on the calculated moduli in each of the loading-unloading cycles for three loading plates was investigated. The geometry, material properties, and boundary conditions on the constructed 3D model were selected based on the in-situ conditions of PLT at Bazoft dam site. A good agreement was achieved between numerical model results and the field tests results.
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References:

[1] Palmstrom, A. The deformation modulus of rock masses, comparison between in situ tests and indirect estimates. Tunneling and underground space technology, Vol. 16, No. 3, 2001, pp.115-131.
[2] ISRM. Suggested method for determining in situ deformability of rock, international journal of rock mechanics and mining science &geotechnics, Abstract 1979; 16:143-6.
[3] Boyle, W. J. Interpretation of plate load test data. International journal of rock mechanics and mining science &geotechnics. Abstract Vol 29, No 2, 1992 pp 133-14.
[4] Agharazi, A. Characterizing rock mass deformation mechanisms during plate load test at the Bakhtiary dam project. International journal of rock mechanics & mining sciences 49 (2012) 1-11, 2001.
[5] Itasca Consulting, Flac3D User Manual. Fast Lagrangian Analysis of Continua in 3D, Itasca Consulting Group, 2002 USA.
[6] ABNIROO. Engineering Co. Bazoft dam and hydropower project, plate loading test at dam site: results of in situ tests, 2010.
[7] Unal, E. Determination of in situ deformation modulus: New approach for plate-loading test. International journal of rock mechanics and mining science and geotechnics, Vol 34, No. 6,2001, pp. 897-915.
[8] Davis, R. O, Selvadruai, A. P. S, Plasticity and Geomechanics, Cambridge University Press; 2002, second edition.
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