Issue 53

Y.D. Shou et alii, Frattura ed Integrità Strutturale, 53 (2020) 434-445; DOI: 10.3221/IGF-ESIS.53.34 442 experiment results prove that the model established in this paper can be well applied to evaluate the constitutive relation of coal-rock. Parameters Values 0 k / MPa 1139.28 0  / MPa 351.84  0.25  0.8325 0 p  0.00479 m p  0.0032 C / MPa 1.49 B 2.5×10 -4  3.75 0 d Y 0.683 m 0.85  1.0 Table 1: The values of parameter involved in the proposed model Figure 8: The theoretical and experimental results of deviatoric stress 1 3   − versus axial strain 1  curve when the confining pressure is 0 MPa.