Finite element-discrete element coupling numerical simulation program (FDEM) input parameter rapid calibration method

A numerical simulation and program input technology, which is applied in the field of rock mechanics and rock engineering, can solve problems such as grid size dependence, and achieve the effects of eliminating dependence, strong applicability, and improving accuracy

Active Publication Date: 2021-02-12
WUHAN UNIV
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Problems solved by technology

What's more serious is that the input parameter has a serious grid size dependence, and it is doubtful that t...

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  • Finite element-discrete element coupling numerical simulation program (FDEM) input parameter rapid calibration method
  • Finite element-discrete element coupling numerical simulation program (FDEM) input parameter rapid calibration method
  • Finite element-discrete element coupling numerical simulation program (FDEM) input parameter rapid calibration method

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Embodiment

[0047] The specific implementation of the rapid calibration of the input parameters of the finite element-discrete element coupling numerical simulation program (FDEM) involved in the present invention will be described in detail below in conjunction with the accompanying drawings. The specific calibration process of FDEM input parameters is as follows:

[0048] Step 1. Process the rock core obtained in the field into a standard rock sample, and carry out indoor uniaxial compression (diameter 50mm×height 100mm) and direct stretching (diameter 50mm×height 100mm) according to the method recommended by the International Society of Rock Mechanics and Engineering (ISRM) Or Brazilian splitting (diameter 50mm×height 25mm) and triaxial compression (diameter 50mm×height 100mm) tests to obtain the macroscopic physical and mechanical parameters of real rock samples, including uniaxial compressive strength σ c , elastic modulus E, Poisson's ratio ν, tensile strength σ t , cohesion c, int...

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Abstract

The invention discloses a finite element-discrete element coupling numerical simulation program (FDEM) input parameter rapid calibration method. The method comprises the following steps of (1) acquiring rock macroscopic physical and mechanical parameters through uniaxial compression, Brazilian splitting and triaxial compression indoor tests; (2) calibrating a joint penalty value Pf by adopting a uniaxial compression simulation test pre-peak stage curve; (3) calibrating normal contact stiffness Pn based on algorithm improvement and single joint unit compression-shear failure; (4) calibrating II-type fracture energy GII by adopting a uniaxial compression simulation test whole process curve; (5) calibrating I-type fracture energy GI by adopting a direct tensile test; (6) calibrating tangential contact stiffness Pt by adopting the uniaxial compression simulation test again; and (7) checking the reliability of the calibrated parameters by adopting triaxial compression, Brazilian splitting and direct shear simulation tests. The calibration method provided by the invention is high in efficiency, eliminates the dependence of parameter values on a grid size, and can be suitable for engineering scale simulation.

Description

technical field [0001] The invention belongs to the field of rock mechanics and rock engineering, and in particular relates to a method for calibrating input parameters of a finite element-discrete element coupling numerical simulation program (FDEM) and a method for verifying reliability of marked parameters. Background technique [0002] The problem of rock cracking is a problem that researchers and engineers need to focus on, because rock cracking will directly affect the stability of surrounding rocks such as tunnels and rock slopes. The fracture of rock has gone through the whole process from elastic deformation to plastic deformation, and then to the mutual contact and large-scale movement of the rock blocks after the rock fracture. On the one hand, the rock material is complex, and the natural rock mass contains a large number of micro-cracks, and the actual engineering rock mass It appears in the form of composite rock mass; on the other hand, the mechanical properti...

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Application Information

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IPC IPC(8): G01N3/62
CPCG01N3/62G01N2203/0216G01N2203/0252G01N2203/0256G01N2203/0067G01N2203/0019G01N2203/0025
Inventor 邓鹏海刘泉声吴坚
Owner WUHAN UNIV
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