Please use this identifier to cite or link to this item:
https://hdl.handle.net/10356/141668
Title: | Numerical investigation of mineralogical composition effect on strength and micro-cracking behavior of crystalline rocks | Authors: | Wong, Louis Ngai Yuen Peng, Jun Teh, Cee Ing |
Keywords: | Engineering::Civil engineering | Issue Date: | 2018 | Source: | Wong, L. N. Y., Peng, J., & Teh, C. I. (2018). Numerical investigation of mineralogical composition effect on strength and micro-cracking behavior of crystalline rocks. Journal of Natural Gas Science and Engineering, 53, 191-203. doi:10.1016/j.jngse.2018.03.004 | Journal: | Journal of Natural Gas Science and Engineering | Abstract: | Mineralogical composition has a great influence on the mechanical behavior and the micro-cracking process of crystalline rocks for CO2 and natural gas storage. This study numerically investigates the influence of mineralogical composition (i.e., quartz content) of a dominantly felsic phaneritic igneous rock with respect to rock strength and the associated micro-cracking behavior using a grain-based modeling approach in two-dimensional Particle Flow Code (PFC2D). First, numerical specimen models with different mineralogical compositions are generated. The generated numerical models have the same geometry of the assembled grain structure to minimize the effect of grain scale heterogeneity on the simulation results. Micro-parameters previously calibrated to match the macro-properties of the Bukit Timah granite are then assigned to the numerical models. In the numerical simulation of uniaxial compression tests, the strength and Young's modulus are found to increase with the increase of quartz content in the numerical model, while the Poisson's ratio and the maximum volumetric strain gradually decrease. The simulated strength behavior is in good agreement with the laboratory test results obtained from previous studies. However, the crack damage stress seems not to be affected by the quartz content. The total number of generated micro-cracks is also found to gradually increase as the quartz content in the numerical model increases. The rock strength shows a good correlation with the total number of generated micro-cracks. Two mechanisms are identified to initiate the nearly vertical macroscopic fractures which are generated in tension. At last, the influence of spatial distribution of mineral grains on the simulated strength property and micro-cracking behavior is discussed. | URI: | https://hdl.handle.net/10356/141668 | ISSN: | 1875-5100 | DOI: | 10.1016/j.jngse.2018.03.004 | Rights: | © 2018 Elsevier B.V. All rights reserved. | Fulltext Permission: | none | Fulltext Availability: | No Fulltext |
Appears in Collections: | CEE Journal Articles |
SCOPUSTM
Citations
10
35
Updated on Feb 5, 2023
Web of ScienceTM
Citations
10
32
Updated on Feb 6, 2023
Page view(s)
97
Updated on Feb 5, 2023
Google ScholarTM
Check
Altmetric
Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.