首页|Optimizing profile line interval for enhanced accuracy in rock joint morphology and shear strength assessments

Optimizing profile line interval for enhanced accuracy in rock joint morphology and shear strength assessments

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2D profile lines play a critical role in cost-effectively evaluating rock joint properties and shear strength.However,the interval(ΔIL)between these lines significantly impacts roughness and shear strength assessments.A detailed study of 45 joint samples using four statistical measures across 500 differentΔIL values identified a clear line interval effect with two stages:stable and fluctuation-discrete.Further statistical analysis showed a linear relationship between the error bounds of four parameters,shear strength evaluation,and their corresponding maximum ΔIL values,where the gradient k of this lin-ear relationship was influenced by the basic friction angle and normal stress.Accounting for these factors,lower-limit linear models were employed to determine the optimal ΔIL values that met error tolerances(1%-10%)for all metrics and shear strength.The study also explored the consistent size effect on joints regardless of ΔIL changes,revealing three types of size effects based on morphological heterogeneity.Notably,larger joints required generally higher ΔIL to maintain the predefined error limits,suggesting an increased interval for large joint analyses.Consequently,this research provides a basis for determining the optimal ΔIL,improving accuracy in 2D profile line assessments of joint characteristics.

Rock jointRoughnessShear strengthSize effectProfile line interval effect

Leibo Song、Quan Jiang、Shigui Du、Jiamin Song、Gang Wang、Yanting Gu、Xingkai Wang、Jinzhong Wu

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School of Civil Engineering,Shaoxing University,Shaoxing 312000,China

Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province,Shaoxing University,Shaoxing 312000,China

State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China

Institute of Rock Mechanics,Ningbo University,Ningbo 315211,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Zhejiang ProvinceOpen Research Fund of State Key Laboratory of Geomechanics and Geotechnical EngineeringOpen Fund of Badong National Observation and Research Station of GeohazardsShaoxing Science and Technology Plan Project

4200227552325905LQ24D020012SKLGME023007BNORSG2023082022A13003

2024

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDEI
影响因子:1.222
ISSN:2095-2686
年,卷(期):2024.34(5)
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