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Abstract Generalized Kelvin model for calculation of contact force between particles is deduced based on the research of theoretical background of particle discrete element method. With the object-oriented programming technique and the redeveloped interface of PFC，the generalized Kelvin contact model is developed and used in a verification example. In the example，two particles are bonded together and the relaxation is calculated by PFC and theoretical method. The result shows that the contact force exponentially decreases as time increases，which coincides with the analytical solution. Based on the researches，taking a deep-buried tunnel for example，the cracking and failure of rock are analyzed under conditions of different contact constitutive models. Results show that the generalized Kelvin contact model is better than linear elastic contact model，and the former is more consistent with the calculation chart from Hoek-Brown strength criterion.
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Received: 18 September 2008
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