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Open Access Research Article

Investigation of local mechanical behavior during the shear process of rough rock joints using DEM

by Jiuyang Huan 1,* ,  Yaoyao Zhuo 1 ,  Yuhao Zhao 1 ,  Zhiwen Wan 1 ,  Weijia Yu 1 ,  Chen Ge 1 ,  Weitao Huan 2  and  Xinyu Lan 3
1
College of Architectural Engineering, Yangzhou Polytechnic Institute, 225100, China
2
Chongqing Yizhi Beijun Real Estate Development Co., Ltd, Chongqing 401121, China
3
Chongqing Mingyantong Technology Co., Ltd, Chongqing 400015, China
*
Author to whom correspondence should be addressed.
RML  2024 1(1):2; https://doi.org/10.70425/rml.202401.2
Received: 29 August 2024 / Accepted: 4 September 2024 / Published Online: 14 September 2024
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Abstract

Rough joints are prevalent in natural rock masses, and their shear mechanical properties are crucial for ensuring the safety and stability of these masses. Existing studies often neglect the contribution of various joint asperities to shear stress resistance. This study addresses this gap by eluci-dating the local shear mechanisms of different asperities in rough joints throughout the shear process. This was achieved through a combination of quantitative and qualitative analyses using the Discrete Element Method (DEM). Initially, Barton's ten standard roughness joint profiles were dig-itized, and rough joints were modeled using the Modified Smooth Joint Model (MSJM). Direct shear tests on joint specimens under constant nor-mal stress were performed using servo-controlled methods. Subsequently, the shear stress behavior was analyzed in relation to the test results. The failure modes of the joint specimens were examined in detail using crack tracking and force chain analysis. The study also explored the relation-ship between the number of cracks and shear stress. Additionally, variations in average stress across ten different segments of joints during shear were monitored using the measuring circle function. The shear resistance contributions of local joint segments were quantitatively assessed using three stress indices: maximum stress, upper limit of maximum stress, and the distribution range of maximum stress. The Joint Roughness Coeffi-cient (JRC) of joints was found to correlate well with these indices. Overall, the progressive failure of local joint segments was analyzed both qual-itatively and quantitatively. The study confirmed that the local shear mechanisms of different joint segments during the shear process are distinct.

Keywords: JRC; Local mechanical behavior; Joint segment; Asperity size; Shear stress; DEM;
Copyright: © 2024 by Huan, Zhuo, Zhao, Wan, Yu, Ge, Huan and Lan. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY) (Creative Commons Attribution 4.0 International License). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
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Funding

Higher Education Basic Science (Natural Science) Research Project of Jiangsu Province in China (Grant No. 23KJD410002) , Yangzhou Green Yang Golden Phoenix Plan (Grant No. 2408008/022) , Yangzhou Housing and Construction System Science and Tech-nology Project (20240726/09) , School level project of Yangzhou Polytechnic Institute (2023xjzk002)

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ACS Style
Huan, J.; Zhuo, Y.; Zhao, Y.; Wan, Z.; Yu, W.; Ge, C.; Huan, W.; Lan, X. Investigation of local mechanical behavior during the shear process of rough rock joints using DEM. Rock Mechanics Letters, 2024, 1, 2. https://doi.org/10.70425/rml.202401.2
AMA Style
Huan J, Zhuo Y, Zhao Y, Wan Z, Yu W, Ge C, Huan W, Lan X. Investigation of local mechanical behavior during the shear process of rough rock joints using DEM. Rock Mechanics Letters; 2024, 1(1):2. https://doi.org/10.70425/rml.202401.2
Chicago/Turabian Style
Huan, Jiuyang; Zhuo, Yaoyao; Zhao, Yuhao; Wan, Zhiwen; Yu, Weijia; Ge, Chen; Huan, Weitao; Lan, Xinyu 2024. "Investigation of local mechanical behavior during the shear process of rough rock joints using DEM" Rock Mechanics Letters 1, no.1:2. https://doi.org/10.70425/rml.202401.2
APA Style
Huan, J., Zhuo, Y., Zhao, Y., Wan, Z., Yu, W., Ge, C., Huan, W., & Lan, X. (2024). Investigation of local mechanical behavior during the shear process of rough rock joints using DEM. Rock Mechanics Letters, 1(1), 2. https://doi.org/10.70425/rml.202401.2

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