Improved parameter selection method for mesoscopic numerical simulation test of direct tensile failure of rock and concrete |
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Authors: | Zhi-guang Liu Jian-yun Chen Wei-feng Bai and Qiang Xu |
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Affiliation: | (1) School of Civil and Resource Engineering, University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia;(2) School of Civil and Environmental Engineering, Nanyang Technological University, Singapore, Singapore;(3) School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Pariser Building, P.O. Box 88, Manchester, M60 1QD, UK |
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Abstract: | In order to numerically simulate the failure process of rock and concrete under uniaxial tension, an improved method of selecting
the mechanical properties of materials was presented for the random mechanic parameter model based on the mesoscopic damage
mechanics. The product of strength and elastic modulus of mesoscale representative volume element was considered to be one
of the mechanical property parameters of materials and assumed to conform to specified probability distributions to reflect
the heterogeneity of mechanical property in materials. With the improved property parameter selection method, a numerical
program was developed and the simulation of the failure process of the rock and concrete specimens under static tensile loading
condition was carried out. The failure process and complete stress-strain curves of a class of rock and concrete in stable
fracture propagation manner under uniaxial tension were obtained. The simulated macroscopic mechanical behavior was compared
with the available laboratory experimental observation, and a reasonable agreement was obtained. Verification shows that the
improved parameter selection method is suitable for mesoscopic numerical simulation in the failure process of rock and concrete. |
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Keywords: | rock concrete stable fracture propagation product of strength and elastic modulus heterogeneity numerical simulation uniaxial tension |
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