On the Effect of Grain Size on Rock Behavior under Cyclic Loading by Distinct Element Method

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Dalirnasab A.; GOSHTASBI K.; NEJATI H.

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Journal Paper

Paper Information

Journal: JOURNAL OF ANALYTICAL AND NUMERICAL METHODS IN MINING ENGINEERING Year:2021 | Volume:10 | Issue:25 Page(s): 23-32

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Title

On the Effect of Grain Size on Rock Behavior under Cyclic Loading by Distinct Element Method

Author(s)

Dalirnasab A. | GOSHTASBI K. | NEJATI H. | Issue Writer Certificate

Keywords

UDEC Software

Cyclic Period

Grain Size Impact on Rock Behavior

Fatigue Loading

Rock Stiffness

Distribution of Stresses in the Rock

Abstract

It is well-known that the mechanical behavior of rocks under cyclic loading is much different from static loading conditions. In most constructions, the load applied to structures is within dynamic ranges. That’ s why a great deal of attention has been paid to this field to identify the dynamic behavior of rocks in more detail. Nevertheless, the nature of dynamic failure in rocks has not yet been identified, particularly when it comes to cyclic loading The purpose of this study was to investigate the influence of grain size on the mechanical behavior of rocks under cyclic loading using numerical modeling by UDEC. A total of three grain-categories with a diameter of 1, 2, and 4 mm were modeled in the software. All models were of Brazilian type with 54 mm diameter. Behavioral parameters required for modeling were determined through laboratory studies and the software was adjusted accordingly. The stresses applied to the samples were in two forms of quasi-static and cyclic loading. The result of static loading is that the smaller the grain size, the model will have a higher elastic modulus. In other words, the elastic modulus of the grain size is inversely related to the grain dimensions. Analysis of data obtained from cyclic loading showed that the amount of strain in samples with smaller grain sizes was lower than the corresponding strain in samples with larger grain sizes during the same loading periods. In other words, the resistance of samples with smaller grain sizes to deformation under cyclic load was higher compared to those with larger grain sizes. Comparison of the stress vectors for these samples showed that with a decrease in grain size, stress distribution in the sample became more uniform and inclusive, and the stress concentration declined. Another important result was that the smaller the grain size, the more the axial stress applied to the sample inclined towards one. This indicated that with a decrease in grain dimensions, the sample behavior approached a plastic behavior.

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APA: Copy

Dalirnasab, A., GOSHTASBI, K., & NEJATI, H.. (2021). On the Effect of Grain Size on Rock Behavior under Cyclic Loading by Distinct Element Method. JOURNAL OF ANALYTICAL AND NUMERICAL METHODS IN MINING ENGINEERING, 10(25 ), 23-32. SID. https://sid.ir/paper/653685/en

Vancouver: Copy

Dalirnasab A., GOSHTASBI K., NEJATI H.. On the Effect of Grain Size on Rock Behavior under Cyclic Loading by Distinct Element Method. JOURNAL OF ANALYTICAL AND NUMERICAL METHODS IN MINING ENGINEERING[Internet]. 2021;10(25 ):23-32. Available from: https://sid.ir/paper/653685/en

IEEE: Copy

A. Dalirnasab, K. GOSHTASBI, and H. NEJATI, “On the Effect of Grain Size on Rock Behavior under Cyclic Loading by Distinct Element Method,” JOURNAL OF ANALYTICAL AND NUMERICAL METHODS IN MINING ENGINEERING, vol. 10, no. 25 , pp. 23–32, 2021, [Online]. Available: https://sid.ir/paper/653685/en

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