Numerical Studies of Cutting Water Saturated Sand by Discrete Element Method

Abstract:

The discrete element method (DEM) has been recognized as an effective tool to simulate soil–tool interactions. In this study, a saturated sand cutting model is developed using a commercial DEM software, Particle Flow Code in Two Dimension (PFC 2D). In the model, soil are defined as particles with the basic PFC 2D model, full coupling with a deformable fluid. The mechanical interactions between particles and also between particles and the walls are modeled by sprints, dash-pots and friction sliders. The properties of the material and interactions (Poisson’s ratio, shear modulus and density, coefficients of restitution, rolling and static friction) relate to the particle properties and not to the bulk properties. Such quantitative and qualitative models are essential for improving the design, selection and use of water saturated sand cutting implements, in different field sand under different conditions. This paper describes a numerical experimental investigation of the failure characteristics of two-dimensional water saturated sand cutting. Comprehensive simulated tests were carried out on sandy loam using a box apparatus and two model plane blades of rake angles 30º, 60º and two angles of friction 32º,42º, respectively. Besides, there are two extreme densities of the sand, compacted and loose. These factors should provide a basis for the reliable prediction of the failure type.

• Periodical: Applied Mechanics and Materials (Volumes 256-259)
• Pages: 306-310
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.256-259.306
• Online since: December 2012
• Authors: Shao Hua Qin, Li Quan Xie, Guo Jun Hong, Jie Wang
• Keywords: Angle of Friction, Particle/Fluid Coupling, PFC^2D Simulation, Shear Angle, Shear Zone

References

[1] El Shamy U, Zeghal M, Shephard M, Dobry R, Fish J, Abdoun T. Discrete element simulations of water flow through granular soils. In: 15th ASCE engineering mechanics conference, (2002).

DOI: 10.1061/40647(259)36

[2] Kalyani Jeysianker, Manjriker Gunraratne. Analysis of water seepage in a pavement system using the particulate approach. Computers and Geotechnics 36(2009) 641-654.

DOI: 10.1016/j.compgeo.2008.09.002

[3] Shimizu Y. Fluid coupling in PFC2D and PFC 3D, manual, itasca consulting group. Numerical modeling in micromechanics via particle methods (2004).

DOI: 10.1201/b17007-44

[4] Itasca. Particle flow code PFC3D release 3. 0. Minneapolis (MN): Itasca Consulting Group, Inc; (2003).

[5] Cundall PA, Strack ODL. A discrete numerical model for granular assemblies. Geotech 1979; 1: 47–65.

[6] Franco, Y., Rubinstein, D., Shmulevich, I., 2007. Prediction of soil–bulldozer blade interaction using discrete element method. Trans. ASABE 50 (2), 345–353.

DOI: 10.13031/2013.22625

[7] Zhang, R., Li, J., 2006. Simulation on mechanical behavior of cohesive soil by distinct element method. J. Terramech. 43 (3), 303–316.

DOI: 10.1016/j.jterra.2005.05.006

[8] O.B. Aluko*, D.A. Seig. An experimental investigation of the characteristics of and conditions for brittle fracture in two-dimensional soil cutting. Soil & Tillage Research 57 (2000) 143-157.

DOI: 10.1016/s0167-1987(00)00156-2