Empirical mode decomposition approach to simplify the fracture roughness for numerical models

Enlin Ma*, Mikael Rinne, Masoud Torkan, Mateusz Janiszewski

*Corresponding author for this work

Research output: Contribution to journalConference articleScientificpeer-review

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Abstract

The shear strength of natural, unfilled rock fractures is influenced by surface roughness. The surface curve of a fracture can be viewed as a waveform graph, and in general, it is of the characteristic that high-frequency represents the low amplitude (local variation) and low-frequency represents the high amplitude (general trend). In this work, the signal processing method, Empirical Mode Decomposition (EMD) was employed to decompose the original fracture surface scanned by photogrammetry to several frequency-dependent curves. Low-frequency curves were selected and composed as the element geometry while high-frequency curves were ignored and replaced by parameters related to the roughness in each surface element in Abaqus. The process of push-shear test is simulated using the simplified fracture curve, showing the geometry simplification by EMD can help model the shear failure of rock fractures.
Original languageEnglish
Article number012011
Number of pages8
JournalIOP Conference Series: Earth and Environmental Science
Volume1124
Issue number1
DOIs
Publication statusPublished - 10 Jan 2023
MoE publication typeA4 Conference publication
EventISRM European Rock Mechanics Symposium: Rock and Fracture Mechanics in Rock Engineering and Mining: Rock and Fracture Mechanics in Rock Engineering and Mining - Dipoli, Otakaari 24, Espoo, Finland
Duration: 11 Sept 202215 Sept 2022
https://www.ril.fi/en/events/eurock-2022.html

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