Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/10596
Title: Study on strain rate effect of soft rock
Authors: Liao, HJ
Pu, WC
Yin, JH 
Keywords: Consolidated undrained triaxial test
Constitutive relation
Rock mechanics
Soft rock
Strain rate
Time-dependency
Issue Date: 2005
Publisher: 岩石力學與工程學報編輯部
Source: 岩石力学与工程学报 (Chinese journal of rock mechanics and engineering), 2005, v. 24, no. 18, p. 3218-3223 How to cite?
Journal: 岩石力学与工程学报 (Chinese journal of rock mechanics and engineering) 
Abstract: Consolidated undrained triaxial tests were conducted on the specimens of diatomaceous soft rock under different pressures and different loading rates, with stress controlled and strain controlled respectively. The test results show that the soft rock has obvious strain rate effect, and strain rates during loading have notable influences on the strength and deformation of soft rock. On the basis of tests, considering the time-dependent behavior of stress-strain relation of diatomaceous soft rock, a 3D elasto-viscoplastic constitutive model (3D EVP model) is introduced to simulate the strain rate effect of soft rock. All parameters of the model are determined by tests. The stress-strain relationship and the effective stress path of undrained consolidated triaxial tests under different strain rates were simulated using 3D EVP model. The numerical calculation results reflect that the strength, including peak strength and residual strength, of soft rock improves with the increasing of strain rate; and they are consistent with the tests results. The trend of pore water pressure and strain softening of calculation results also show agreement with test results. Through comparing and analysis, it is found that 3D EVP model is effective to describe the strain rate effect of soft rock.
URI: http://hdl.handle.net/10397/10596
ISSN: 1000-6915
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