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A hybrid finite-discrete element method for modelling cracking processes in sandy mudstone containing a single
Xiaolong Zhang1,2,3, Wenjie Xu4, Xiaoping Zhang5
1National Institute of Natural Hazards, Ministry of Emergency Management of China (NINH, MEMC), Beijing, 100085, China.
Scientific Reports
|July 3, 2024
Summary
This study introduces a hybrid finite-discrete element method (HFDEM) to simulate rock failure under dynamic loads. HFDEM accurately models crack propagation and shows rocks are stronger under higher frequency cyclic loading.
Area of Science:
- Geotechnical Engineering
- Computational Mechanics
- Rock Mechanics
Background:
- Rock deformation and failure are complex processes involving crack initiation, propagation, and coalescence.
- Simulating the transition of rocks from continuous to discontinuous states under cyclic dynamic loading presents significant challenges.
Purpose of the Study:
- To develop and validate a hybrid finite-discrete element method (HFDEM) for modeling rock crack propagation and failure.
- To investigate the influence of pre-existing flaw inclination and dynamic loading frequency on rock failure mechanisms.
Main Methods:
- A hybrid finite-discrete element method (HFDEM) was employed, integrating a frequency-dependent cohesive-zone model.
- Simulations were conducted on standard sandy mudstone under quasi-static and cyclic dynamic loading conditions.
- HFDEM results were validated against experimental data for mechanical properties and failure behavior.
Main Results:
- HFDEM successfully captured crack interaction mechanisms and accurately simulated overall specimen failure.
- Rock samples demonstrated significantly higher compressive strength under dynamic loading compared to quasi-static loading.
- Compressive strength increased with higher cyclic dynamic load frequencies, providing insights into failure mechanisms.
Conclusions:
- The HFDEM is a reliable tool for simulating rock mass deformation and failure under dynamic loads.
- Dynamic loading frequency significantly influences rock strength and failure modes.
- The findings offer valuable guidance for engineering practices related to seismic loads and rock failure analysis.
Keywords:
Cohesive zone modelCyclic dynamic loadingHybrid FDEMQuasi-static loadingRock failure mechanismMore Related Videos
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