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Approach for determining micro-strength parameters of rock based on particle flow code.
Luli Miao1, Xinrong Liu2, Yan Fu3,4
1School of Civil Engineering, Chongqing University, Chongqing, 400045, China. MiaoGeo@outlook.com.
Scientific Reports
|May 16, 2024
Summary
This study presents a new method for selecting micro-strength parameters in particle flow code (PFC) simulations for rock mechanics. The approach refines theoretical relationships using numerical Brazilian tests to accurately predict rock tensile strength.
Area of Science:
- Geomechanics
- Computational rock mechanics
- Numerical modeling
Background:
- Discrete Element Method (DEM) and Particle Flow Code (PFC) are crucial for modeling rock behavior in geomechanics.
- Accurate selection of microparameters for PFC models, particularly the contact bond model (CBM), is essential but challenging.
- Existing methods lack a direct approach for determining CBM micro-strength parameters.
Purpose of the Study:
- To develop a novel and convenient method for calculating appropriate micro-strength parameters for the PFC contact bond model (CBM).
- To establish a theoretical and statistical relationship between rock tensile strength and CBM micro-strength parameters.
- To enhance the accuracy of DEM simulations in rock engineering applications.
Main Methods:
- Utilized Plackett-Burman (PB) design for qualitative analysis to identify key factors influencing Brazilian tensile strength.
- Analyzed stress conditions in a Brazilian disc using continuum models and DEM to derive a theoretical relationship.
- Conducted extensive numerical Brazilian tests to establish statistical correlations between geometric parameters, micro-strength parameters, and tensile strength.
- Refined the theoretical equation using simulation results to create a modified equation for predicting rock tensile strength.
Main Results:
- Identified microscopic tensile strength as the primary factor affecting Brazilian tensile strength through PB design.
- Established a theoretical equation linking rock tensile strength to micro-strength parameters.
- Developed a refined, statistically validated equation for predicting rock tensile strength based on numerical simulations.
- Confirmed the feasibility and accuracy of the proposed method for selecting CBM microparameters.
Conclusions:
- The developed method provides a practical approach for determining essential micro-strength parameters in PFC simulations.
- The refined equation enhances the predictive capability of DEM for rock tensile strength.
- This work contributes to more reliable geomechanical modeling and rock engineering design.
