Numerical simulation of undrained behavior of granular material with polygonal particles by discrete element method (DEM)

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Khabazian Masoud; Seyedi hoseininia Ehsan

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Journal: Modares Civil Engineering journal Year:2018 | Volume:19 | Issue:1 Page(s): 141-153

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Title

Numerical simulation of undrained behavior of granular material with polygonal particles by discrete element method (DEM)

Author(s)

Khabazian Masoud | Seyedi hoseininia Ehsan | Issue Writer Certificate

Keywords

Polygonal particlesQ1

Cylinder methodQ1

Discrete element method (DEM)Q1

Numerical simulationQ2

Abstract

In the present study, discrete element method is used to simulate undrained two-dimensional behavior of Polygonal particles in which, the Cylinder method is used. By this method, pore pressure of the voids in a sample can be studied independently. In the Cylinder method, it is assumed that there are channels among adjacent pores and the possibility of water exchange among the centers of the pores is provided. The pipes connect the adjacent pores center. Therefore, the pipe length is equal to the center distance of two adjacent pores. The diameter of all pipes is identical which represents the permeability of the soil. First, by using this method, the variations of average pore pressure versus deviatoric strain and pore pressure distribution contour in a sample with Polygonal particles were compared with another study with elliptical particles that showed good conformity. The constant volume method was also used to simulate the undrained behavior of the sample and the results of both methods were compared. In the constant volume method, it is assumed that the sample volume stays constant during loading. The simulation was done for samples by two methods. These samples were subjected to confining pressure of 200 kPa and after consolidation, were loaded under deviatoric stress. The results showed that the output obtained by the Cylinder method are in good agreement with the constant volume method and by increasing the stiffness of the water, the results of both methods containing the variations of the deviatoric stress and the pore pressure are closer to each other. In following, the undrained behavior was investigated by using Cylinder method in terms of shear strength and pore water pressure in a sandy sample at the confining pressures of 200, 400, 800 and 1600 kPa. The Simulation results are in good agreement with laboratory results in such a way that more confining pressure, the shear strength and pore pressure are more positive, but by increasing confining pressure, the amount of pore pressure decreases in the specimen. The pore pressure distribution contour at the strains of 10% and 30% was presented by means of Cylinder method and the effect of cylinder diameter changes on the pore pressure distribution contour was investigated. Investigating the pore pressure distribution contour at the strains of 10% and 30% showed that pore pressure in the sample center has the lowest value. The pore pressure in the sample pores closes by increasing the cylinder diameter, while the smaller the diameter of the cylinder, the greater the water pressure difference among the pores. At last, the effect of pore position on the pore pressure was studied. For this purpose, four positions were considered through the sample and the variations of the average pore pressure versus axial strain at three pipe diameters of 40, 200 and 450 micrometers were investigated. The results showed that the pressure of the whole sample pores get closer by increasing the pipe diameter. As the pipe diameter decreased, the pressure difference between the sample pores gets higher and this difference will be greater in the larger strains.

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APA: Copy

Khabazian, Masoud, & Seyedi hoseininia, Ehsan. (2018). Numerical simulation of undrained behavior of granular material with polygonal particles by discrete element method (DEM). MODARES CIVIL ENGINEERING JOURNAL, 19(1 ), 141-153. SID. https://sid.ir/paper/256641/en

Vancouver: Copy

Khabazian Masoud, Seyedi hoseininia Ehsan. Numerical simulation of undrained behavior of granular material with polygonal particles by discrete element method (DEM). MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2018;19(1 ):141-153. Available from: https://sid.ir/paper/256641/en

IEEE: Copy

Masoud Khabazian, and Ehsan Seyedi hoseininia, “Numerical simulation of undrained behavior of granular material with polygonal particles by discrete element method (DEM),” MODARES CIVIL ENGINEERING JOURNAL, vol. 19, no. 1 , pp. 141–153, 2018, [Online]. Available: https://sid.ir/paper/256641/en

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