1- Shiraz University
2- Shiraz University ,rahimi_e@shirazu.ac.ir
3- Hamedan University of Technology,
2- Shiraz University ,
3- Hamedan University of Technology,
Abstract: (101 Views)
Numerical modeling serves as a crucial tool in engineering analyses, particularly within the fields of geoscience and geotechnical engineering. The software PFC2D stands out in this domain, employing the Discrete Element Method (DEM) to simulate processes related to engineering geology and geotechnical assessments. This study focuses on the analysis and comparison of two common contact models: the Flat Joint Model (FJM) and the Linear Parallel Bond Model (LPBM). The Unconfined Compressive Strength (UCS) test is selected as a benchmark for calibrating and validating the PFC models. Sandstone samples for this research are sourced from the Aghajari formation located on the southern limb of the Madar anticline. The findings show that both contact models have high ability in simulating UCS in the calibration process. Since this test is primarily utilized to calibrate the failure point (σc) and Young's modulus, the output values for both models are nearly identical. However, the post-failure behavior in the stress-strain curves differs between the models, with the FJM demonstrating a more brittle response compared to the LPBM. The FJM model's ability to simulate rough surfaces and material discontinuities allows for the representation of tensile crack occurrences.
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