Method for calculating micro-mechanical parameters of reinforced tailings based on PFC discrete element

Abstract

The invention relates to a method for calculating micro-mechanical parameters of reinforced tailings based on PFC discrete elements. The method comprises the following specific steps: obtaining macromechanical parameters through a geogrid and tailing sand indoor direct shear test; by utilizing PFC discrete element software, establishing a direct shear test numerical model, determining an overlying load by adjusting servo confining pressure in the model, and before the direct shear test of the model is started, substituting macro mechanical parameters such as peak shear stress intensity, density, apparent cohesive force, an internal friction angle and a friction coefficient calculated by the test into a command; and, after the program is started and the operation is completed, obtaining the numerical values of the normal stiffness and the tangential stiffness of the mesomechanics parameters in the model shear test process. The method has the advantages that: macroscopic mechanical parameters are obtained through indoor tests, mesoscopic mechanical parameters can be obtained through numerical simulation calculation, a macroscopic and mesoscopic parameter relevance calculation method is improved, calculation efficiency is higher, results are more accurate, important mesoscopic mechanical parameter indexes can be provided for safety and stability calculation of the reinforced tailing fill dam, and the contact state of the tailings particles is clearly described in numerical simulation, so that a numerical simulation result is closer to an actual working condition.

Description

technical field [0001] The invention belongs to the field of mine safety and disaster prevention and control, and in particular relates to a method for calculating mesomechanical parameters of reinforced tailings based on PFC discrete elements. Background technique [0002] Tailings sand is a bulk material, and it cannot directly express the contact state between particles when analyzing safety and stability. In order to further study the mechanical properties of the geogrid-reinforced tailings-sand interface, the PFC discrete element was used to establish a two-dimensional shear test model to simulate the indoor direct shear test, and the correlation between the macro and micro parameters was analyzed. At present, most scholars focus on the mesoscopic parameters of the bonding model (including normal bond stiffness, tangential bond stiffness, normal bond strength, tangential bond strength, etc.) and macroscopic mechanical parameters (including elastic modulus, compressive s...

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Problems solved by technology

The bonding model is mainly used to simulate high-viscosity materials such as rock and concrete, and there are few studies on the linear contact model and its correlation of low-cohesion tailings sand.

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