Volume 17, No. 2, 2023
Received: 2022/07/08, Accepted: 2023/03/08
Authors:
Shanshan Guo; Deyong Cui; Liang Lv;
Abstract:
Damage mechanism for joint rock-like materials is of great importance to maintain the stability of concrete constructions. Based on the Mohr-Coulomb criterion and Lemaitre strain equivalence hypothesis, the coupling damage constitutive model of rock masses was improved to apply in the plain concrete. These parameters including the mesoscopic, macro-meso coupling damage variable and the fractal dimension were calculated to reveal the non-linear mechanical behaviors during the damage evolution. Compared the experimental and theoretical parameters, the model�s rationality has been verified. The results show the coupling damage constitutive model of rock masses has a good applicability on the plain concrete. Factors affected on the damage deformation mainly show as two types of joint numbers and inclination angles. With the joint number increasing, the early damage accumulation becomes larger, and the inflection point of damage rate occurs in advance. When the inclination angle is changed, the damage deformation is of great difference. The damage cumulative curve of plain concrete specimens shows as an evolution law of S-type curve. Both the peak strength and elastic modulus have a positive correlation with the damage variable. Moreover, the smaller the peak strength, the larger the fractal dimension and coupling damage variable.
Keywords:
Rock mechanics, Plain concrete, Damage constitutive model, Different joint types, Uniaxial compression, Fractal box dimension