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Based on a tailing dam project, tailing sands are simulated as discrete materials in this paper. Taking the distribution rule of tailing sands into account, the discrete element software PFC2D is adopted to examine the stability and instability process of the dam according to fundamental particle flow principles. The PFC2D model is established according to the deposition rule of tailing sands in the tailing dam then the function of strength reduction is proposed based on the principle of strength reduction to simulate the flooding condition as well as the factor of safety at the stable state and the displacement at the instability process under the particular condition. In addition, comparison is made with the limit equilibrium method and the obtained difference in factor of safety is discussed. The obtained factor of safety for the stability of dam slope from PFC2D analysis is higher than expectation mainly because the micro-parameters in PFC2D affect many macro-parameters simultaneously and the relation between micro-parameters and macro-parameters are nonlinear, which well fits engineering practice. (Received in February 2015, accepted in May 2015. This paper was with the authors 2 months for 1 revision.)

Study on Failure Process of Tailing Dams Based on Particle Flow Theories