A consecutive joint shear strength model considering the 3D roughness of real contact joint surface

Liren Ban ¹Zhigang Tao ²Weisheng Du ³Yuhang Hou¹

扫码查看

作者信息

1. School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China
2. State Key Laboratory of Deep Geotechnical Mechanics and Deep Underground Engineering,Beijing 100083,China;State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Beijing 100083,China
3. Deep Mining and Rock Burst Research Branch,China Coal Research Institute,Beijing 100013,China;State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China
折叠

Abstract

A consecutive joint shear strength model for soft rock joints is proposed in this paper,which takes into account the degradation law of the actual contact three-dimensional(3D)roughness.The essence of the degradation of the maximum possible dilation angle is the degradation of the 3D average equivalent dip angle of the actual contact joint asperities.Firstly,models for calculating the maximum possible dilation angle at the initial and residual shear stress stages are proposed by analyzing the 3D joint morphology characteristics of the corresponding shear stages.Secondly,the variation law of the maximum possible dilation angle is quantified by studying the degradation law of the joint micro convex body.Based on the variation law of the maximum possible dilation angle,the maximum possible shear strength model is proposed.Furthermore,a method to calculate the shear stiffness degradation in the plastic stage is pro-posed.According to the maximum possible shear strength of rock joints,the shear stress-shear displace-ment prediction model of rock joints is obtained.The new model reveals that there is a close relationship between joint shear strength and actual contact joint roughness,and the degradation of shear strength after the peak is due to the degradation of actual contact joint roughness.

Key words

Shear strength/Actual contact area/3D roughness/Shear test

引用本文复制引用

基金项目

National Natural Science Foundation of China(52208328)

National Natural Science Foundation of China(52104090)

Innovation Fund Research Project of State Key Laboratory for GeoMechanics and Deep Underground Engineering(SKLGDUEK202201)

Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering(Z020007)

出版年

2023

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)

CSTPCDCSCD北大核心EI

影响因子：1.222

ISSN：2095-2686

参考文献量1

段落导航