Izvorni znanstveni članak
https://doi.org/10.31534/engmod.2018.3.ri.05m
The strain softening model of rock damage under compression and tension
Xiaoen Wu
; Business School, Central South University, Changsha 410083, CHINA; China Energy Engineering Group Equipment Co. Ltd., Beijing 100044, CHINA
Pingyuan Yang
; China Power Construction Engineering Consulting Co. Ltd., Beijing 100011, CHINA
Junhua Chen
; School of Civil Engineering, Central South University, Changsha 410075, CHINA
Sažetak
Deformation and failure of brittle material under compression are different from those under tension. The differences are characteristic for the brittle material such as rock, concrete and others. At present, few constitutive models for rock can reflect the differences. A damage-induced softening model for rock constitutive relations is presented based on statistical strength theory, continuum damage mechanics and elastic mechanics. The model can consider properties of rock mechanics such as strain softening, difference in strength between compression and tension, non-liner stress-strain relation, compressive hardening, brittleness and so on. The model is well-adapted, simple and practical as it is flexible and has only 7 parameters which can be easily obtained from uniaxial test under compression and tension. Under triaxial compression, uniaxial compression and uniaxial tension, the stress-strain relations obtained from the presented model are compared with those obtained from laboratory tests. The comparisons show that the differences between results obtained respectively from the presented model and laboratory tests are small. The presented model is rational.
Ključne riječi
rock mechanics; damage mechanics; constitutive relation; compression; tension; strain softening.
Hrčak ID:
218241
URI
Datum izdavanja:
26.3.2019.
Posjeta: 1.140 *