Document Type : Research Article
Civil Eng. Department, Faculty of Engineering, Ferdowsi University of Mashhad
Civil Eng. Department, Faculty of engineering, Ferdowsi University of Mashhad
Faculty of Engineering, Ferdowsi University of Mashhad
The behavior of cemented sand because of presence of bonds between particles is different from uncemented sand. In this study, by using a numerical method called discrete element, the effect of bond strength on the mechanical behavior of cemented sand under isotropic compression test is investigated. For simulation of bonds, a bond contact model is used and in this model the tension and shear resistance of bonds are assumed to be equal. In this model, it is essential for particles to have physical contact and overlap to consider that they are bonded to each other. For simulation isotropic compression tests, three kinds of bond strength are used, and samples are loaded up to the 60 MPa level of isotropic stress. The results indicate that by an increase in bond strength of cemented sample, the sample resists more against volume reduction and also, primary and gross yield stress are increased. Results show that when a cemented sample reaches the primary yield point, the rate of broken bond increases. The pressure that is carried out by bonds increased by an increase in volumetric strain and also it increased by increase in bond strength. In this research, to show the accuracy the results of simulation, they are validated by experimental results.