FRACTAL CHARACTERISTICS OF CORE DISKING FRACTURE SURFACES

Jia-Shun Luo, Ya-Chen Xie, Jian-Xing Liao, Xu-Ning Wu, Yan-Li Fang, Liang-Chao Huang, Ming-Zhong Gao and Michael Z. Hou
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Jia-Shun Luo: Institute of Subsurface Energy Systems, Clausthal University of Technology, Clausthal-Zellerfeld 38678, Germany†State Key Laboratory of Oil and Gas, Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, P. R. China
Ya-Chen Xie: Institute of Subsurface Energy Systems, Clausthal University of Technology, Clausthal-Zellerfeld 38678, Germany§State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, P. R. China
Jian-Xing Liao: ��Guizhou Provincial Key Laboratory of Rock and Soil Mechanics and Engineering Safety, College of Civil Engineering, Guizhou University, Guiyang, Guizhou 550025, P. R. China
Xu-Ning Wu: Institute of Subsurface Energy Systems, Clausthal University of Technology, Clausthal-Zellerfeld 38678, Germany†State Key Laboratory of Oil and Gas, Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, P. R. China
Yan-Li Fang: Institute of Subsurface Energy Systems, Clausthal University of Technology, Clausthal-Zellerfeld 38678, Germany‡Sino-German Research Institute of Carbon Neutralization and Green Development, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
Liang-Chao Huang: Institute of Subsurface Energy Systems, Clausthal University of Technology, Clausthal-Zellerfeld 38678, Germany‡Sino-German Research Institute of Carbon Neutralization and Green Development, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
Ming-Zhong Gao: �Institute of Deep Earth Science & Green Energy, Shenzhen University, Shenzhen, Guangdong 518060, P. R. China
Michael Z. Hou: Institute of Subsurface Energy Systems, Clausthal University of Technology, Clausthal-Zellerfeld 38678, Germany‡Sino-German Research Institute of Carbon Neutralization and Green Development, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China

FRACTALS (fractals), 2024, vol. 32, issue 04, 1-12

Abstract: The morphological characteristics of core disking can reflect the in-situ stress field characteristics to a certain extent, but a quantitative description method for disking-induced fracture surfaces is needed. The fractal geometry was introduced to refine the three-dimensional characteristics of the core disking fracture surfaces, and the disking mechanism was explored through morphological characteristics. The innovative concentric-different scale method was proposed to divide the circular surfaces into square surfaces of different sizes. Furthermore, the applicability of four cubic covering methods for single fractal calculation was studied. Finally, the relative differential cubic covering method and multifractal method were used to calculate the three-dimensional data of core disking fracture surfaces in the Jinping area. The results showed that the concentric-different scale method fits the fractal dimension changing law in the exploration of different surface sizes. Using the differential cubic covering method and the relative differential cubic covering method can obtain good results for smoother surfaces. The disking was caused by tensile stress due to high crustal stress unloading, and the cracks originated from the inside of the core. Fractal theory is conducive to analyzing the morphology of rock fracture surfaces and provides guidance for exploring the failure mechanism and influencing factors.

Keywords: Fractal Dimension; Roughness; Disking; Fracture Mechanism (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1142/S0218348X24400188

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