Shear Mechanical Properties of Artificial Rock Specimen with Symmetrical and Asymmetric Toothed Structural Joints
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ORIGINAL PAPER
Shear Mechanical Properties of Artificial Rock Specimen with Symmetrical and Asymmetric Toothed Structural Joints Liangxiao Xiong1,2 • Haijun Chen3 • Yao Zhang4
Received: 21 May 2020 / Accepted: 1 September 2020 Ó Indian Geotechnical Society 2020
Abstract Direct shear tests on cement mortar samples with symmetrical and asymmetric toothed structural joints were conducted in this study. The main objective is to study the effect of the left undulation angle (i1), the right undulation angle (i2), and the length (l) of the undulation body on the shear properties of artificial jointed rock samples. The test results show that for artificial rock samples with throughsymmetrical toothed structural joints (i1 = i2), there is a significant increase in the shear strength and cohesion c of the test specimens when i1 remains constant and l gradually increases. An increase occurs in the shear strength and internal friction angle u when there is a gradual increase in i1 and l remains constant. For those samples with throughasymmetrical toothed structural joints (i1 = i2), there is a significant increase in the shear strength and cohesion c of the test specimens when i1 remains constant and l gradually increases, and the shear strength of the specimen first increases and then decreases when i1 increases from 15° to 75° and l remains constant. & Liangxiao Xiong [email protected] Haijun Chen [email protected] Yao Zhang [email protected] 1
School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China
2
Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning 530004, China
3
Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210029, China
4
AECOM, 2020 L Street, Sacramento, CA, USA
Keywords Artificial jointed rock specimen Toothed structural joint Undulation angle Shear strength
Introduction A large number of engineering practices have shown that failures of structural joints are the primary sources of structural failures in rock masses. The occurrence of natural disasters, such as landslides and collapses, are closely related to the structural joint failures of the associated rock mass. In nature, the serrated rock mass structural joints are typical rock mass structural joints. Presently, symmetric and asymmetric structural joints are found in sawtooth structural joints and many studies about direct shear tests on the rock specimen with serrated structural joint are now available. Yang et al. [1] found that the difference in contributing sequence by the 30° and 15° teeth in shear behavior is insignificant at higher stress levels. Jafari et al. [2] found that dilation angle, degradation of asperities, and wearing are three main factors which affect the shear strength of rock joints during large cyclic displacement. Xue et al. [3] conducted laboratory investigation into the shear behavior of Sydney Hawkesbury sandstone-concrete joints, and the tests showed that significant wear of the sands
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