Journal Published Online: 07 January 2022
Volume 50, Issue 3

Investigation on the Shear Behavior of Rough Rock Joints Prepared by Three-Dimensional Engraving Technique

CODEN: JTEVAB

Abstract

Laboratory shear test is an important and widely used method to investigate the shear behavior of rock joints, and the preparation of joint specimens is a key factor that influences test results. In order to study the shear mechanism of rough rock joints with different morphologies in the laboratory, an innovative three-dimensional (3D) engraving technique was employed to produce specimens with rough joints. Intact sandstone and cement mortar blocks were used as model materials. The engraving parameters were determined to ensure a satisfactory engraving precision and to save as much time as possible for an engraving process. Three Barton profiles with joint roughness coefficient (JRC) values of 2.8, 10.8, and 18.7 were selected as the morphology prototypes for automatically engraving the model material blocks to obtain rough joint specimens. Shear tests were then conducted under four normal stress levels in the laboratory. In addition, numerical simulations on joints with the same physico-mechanical properties, surface morphology, and boundary conditions as the joint tested in the laboratory were performed. The failure characteristics, shear behavior curves, and shear strength obtained from numerical and experimental studies were analyzed considering the effect of joint materials, joint roughness, and applied normal stress. The shear mechanism of rough joints was investigated, and the analysis indicated that the results of shear tests by simulation and experiment were similar. The results revealed that it is feasible to make rough joints by engraving either real rocks or commonly used model materials (e.g., cement mortar).

Author Information

Zhang, Xiaobo
School of Civil Engineering and Architecture, Nanchang University, Nanchang, Jiangxi Province, People’s Republic of China Key Laboratory of Tailings Reservoir Engineering Safety of Jiangxi Province, Nanchang University, Nanchang, Jiangxi Province, People’s Republic of China Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education, Wuhan Institute of Technology, Wuhan, Hubei Province, People’s Republic of China
Zhu, Xi
School of Civil Engineering and Architecture, Nanchang University, Nanchang, Jiangxi Province, People’s Republic of China Key Laboratory of Tailings Reservoir Engineering Safety of Jiangxi Province, Nanchang University, Nanchang, Jiangxi Province, People’s Republic of China
Yao, Chi
Key Laboratory of Tailings Reservoir Engineering Safety of Jiangxi Province, Nanchang University, Nanchang, Jiangxi Province, People’s Republic of China School of Civil Engineering and Architecture, Nanchang University, Nanchang, Jiangxi Province, People’s Republic of China
Ouyang, Shu
School of Civil Engineering and Architecture, Nanchang University, Nanchang, Jiangxi Province, People’s Republic of China Key Laboratory of Tailings Reservoir Engineering Safety of Jiangxi Province, Nanchang University, Nanchang, Jiangxi Province, People’s Republic of China
Yang, Jianhua
School of Civil Engineering and Architecture, Nanchang University, Nanchang, Jiangxi Province, People’s Republic of China Key Laboratory of Tailings Reservoir Engineering Safety of Jiangxi Province, Nanchang University, Nanchang, Jiangxi Province, People’s Republic of China
Jiang, Qinghui
School of Civil Engineering, Wuhan University, Wuhan, Hubei Province, People’s Republic of China
Pages: 16
Price: $25.00
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Stock #: JTE20210282
ISSN: 0090-3973
DOI: 10.1520/JTE20210282