Construction method of two-dimensional discrete element model of parent rock and its granular materials

Abstract

The invention discloses a construction method for a two-dimensional discrete element model of a mother rock and a particle material thereof. The construction method comprises three steps of grading curve correction, mother rock test discrete element modeling and particle material discrete element modeling. The step of grading curve correction comprises the sub-step of redistributing the mass of a smallest particle fraction to the remaining particle fractions according to the quality ratio of particles of particle fractions except the particle fraction of a finest stage in a grading curve to obtain a correction simulation curve in a computer operation simulation range and a particle diameter range of basic particle units. The particle material discrete element modeling comprises the sub-step of: firstly, randomly generating a rock area outline; secondly, forming a rock unit from the basic particle units; thirdly, assigning contact attributes in rocks; finally, assigning the contact attributes between the rocks. In rock aggregation generated according to the construction method, good randomness and diversity are available for the particle number and the form of composed rocks and the actual outline of the rocks; the rock size is generated according to a certain grading condition and satisfies the requirement of certain porosities.

Description

technical field [0001] The invention relates to the field of rock and soil particle modeling, in particular to a method for constructing a two-dimensional discrete element model of parent rock and granular materials. Background technique [0002] The rockfill bodies used in subgrades and earth-rock dams are generally composed of broken parent rocks according to a certain gradation, and their properties such as stress deformation and crushing have a great impact on the quality of the project. At present, laboratory tests are generally used for their Research, but the investment in funds and manpower is relatively large. If the method of numerical simulation is used to study the mechanical properties of the parent rock and its granular materials, it can greatly reduce the investment in funds and manpower, and improve productivity. Therefore, it is necessary to propose a method for constructing a discrete element model suitable for parent rock and its granular materials. [00...

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Problems solved by technology

[0002] The rockfill bodies used in subgrades and earth-rock dams are generally composed of broken parent rocks according to a certain gradation, and their properties such as stress deformation and crushing have a great impact on the quality of the project. At present, laboratory tests are generally used for their However, the investment in funds and manpower is large. If the numerical simulation method is used to study the mechanical properties of the parent rock and its granular materials, the investment in funds and manpower can be reduced to a large extent, and the productivity can be improved.

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