自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 11    November 2019

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Fourier-shape-based reconstruction of rock joint profile with realistic unevenness and waviness features
NIE Zhi-hong(聂志红)1, WANG Xiang(王翔)1, HUANG Dong-liang(黄栋梁)1, ZHAO Lian-heng(赵炼恒)1, 2

1. School of Civil Engineering, Central South University, Changsha 410075, China;
2. Key Laboratory of Heavy-haul Railway Engineering Structure (Ministry of Education),
Central South University, Changsha 410075, China

Abstract:Rock joint shape characteristics, waviness and unevenness play essential but distinct roles in shear mechanism of rock joints. This study presents a novel method to generate virtual rock joint profiles with realistic waviness and unevenness features. Firstly, joint profiles are obtained by 3D laser scanning device. Secondly, quantification of waviness and unevenness is conducted by traditional method, including digital filtering technique and roughness parameter RL. Thirdly, the discrete Fourier transform (DFT) method is employed to analyze the joint outlines. Two representative Fourier shape descriptors (D3, D8) for characterization of waviness and unevenness are suggested. Then, the inverse discrete Fourier transform (IDFT) is adopted to reconstruct the joint profiles with random values of phase angles but prescribed amplitudes controlled by D3 and D8. The traditional method is then applied to the reconstructed joint profiles to examine statistically the relationships between D3 and D8 and parameters RL of waviness and unevenness, respectively. The results show that larger D8 tends to result in larger waviness while higher D3 tends to increase unevenness. Reference charts for estimation of waviness and unevenness with different pairs of D3 and D8 are also provided to facilitate implementation of random joint reconstruction.

 

Key words: rock joint profile; joint shape analysis; discrete Fourier transform; joint reconstruction

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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