首页|On the calibration of a shear stress criterion for rock joints to represent the full stress-strain profile

On the calibration of a shear stress criterion for rock joints to represent the full stress-strain profile

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Conventional numerical solutions developed to describe the geomechanical behavior of rock interfaces subjected to differential load emphasize peak and residual shear strengths.The detailed analysis of pre-and post-peak shear stress-displacement behavior is central to various time-dependent and dynamic rock mechanic problems such as rockbursts and structural instabilities in highly stressed conditions.The complete stress-displacement surface(CSDS)model was developed to describe analytically the pre-and post-peak behavior of rock interfaces under differential loads.Original formulations of the CSDS model required extensive curve-fitting iterations which limited its practical applicability and transparent integration into engineering tools.The present work proposes modifications to the CSDS model aimed at developing a comprehensive and modern calibration protocol to describe the complete shear stress-displacement behavior of rock interfaces under differential loads.The proposed update to the CSDS model incorporates the concept of mobilized shear strength to enhance the post-peak formulations.Barton's concepts of joint roughness coefficient(JRC)and joint compressive strength(JCS)are incorpo-rated to facilitate empirical estimations for peak shear stress and normal closure relations.Triaxial/uniaxial compression test and direct shear test results are used to validate the updated model and exemplify the proposed calibration method.The results illustrate that the revised model successfully predicts the post-peak and complete axial stress-strain and shear stress-displacement curves for rock joints.

Full shear profilePost-peak shear behaviorRock jointJoint roughness coefficient(JRC)Axial stress-strain curve

Akram Deiminiat、Jonathan D.Aubertin、Yannic Ethier

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Department of Construction Engineering,École de Technologie Supérieure(ÉTS),Montréal,Canada

Natural Sciences and Engineering Research Council of Canada through its Discovery Grant programécole de Technologie Supérieure(éTS)construction engineering research funding

RGPIN-2022-03893

2024

10.1016/j.jrmge.2023.07.019

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2024.16(2)
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