Experimental Research on Threshold Values of Deformation Failure of Rock Discontinuities with Different Roughness Under Cyclic Loading and Unloading

ZHENG Wei; WANG Zhen; GU Linlin; LI Hujun; MA Junnan

doi:10.13204/j.gyjzG21120802

Volume 53 Issue 2

Feb. 2023

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ZHENG Wei, WANG Zhen, GU Linlin, LI Hujun, MA Junnan. Experimental Research on Threshold Values of Deformation Failure of Rock Discontinuities with Different Roughness Under Cyclic Loading and Unloading[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(2): 163-168. doi: 10.13204/j.gyjzG21120802

Citation:

ZHENG Wei, WANG Zhen, GU Linlin, LI Hujun, MA Junnan. Experimental Research on Threshold Values of Deformation Failure of Rock Discontinuities with Different Roughness Under Cyclic Loading and Unloading[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(2): 163-168. doi: 10.13204/j.gyjzG21120802

Citation:

ZHENG Wei, WANG Zhen, GU Linlin, LI Hujun, MA Junnan. Experimental Research on Threshold Values of Deformation Failure of Rock Discontinuities with Different Roughness Under Cyclic Loading and Unloading[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(2): 163-168. doi: 10.13204/j.gyjzG21120802

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Experimental Research on Threshold Values of Deformation Failure of Rock Discontinuities with Different Roughness Under Cyclic Loading and Unloading

doi: 10.13204/j.gyjzG21120802

1. Department of Civil Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
2. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;
3. Department of Civil Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan

Received Date: 2021-12-08
Available Online: 2023-05-25
Publish Date: 2023-02-20

Abstract

Abstract

The threshold value of rock is an important parameter to predict whether deformation failure occurs. To study the changing law of threshold value and its influence on rock deformation characteristics, using the CSS-1950 biaxially rheological testing machine for rock to conduct the cyclic loading and unloading test for cement mortar blocks with different roughness of Barton curve discontinuities, by analyzing the deformation characteristics of different rock discontinuities specimens under various normal stresses, the solution method of threshold value was summarized. Based on the calculation results of threshold values, the relation between the threshold value, the joint roughness coefficient (JRC) and the normal stress was analyzed. The effects of the JRC and the normal stress on the deformation characteristics of rock discontinuities were discussed. Research showed that with the increase of the shear load level, the displacement of the rock discontinuity subjected to cyclic loading first grew in a linear trend, and then grew in a nonlinear development state. The horizontal stress values corresponding to the two turning points were the threshold values of the rock discontinuity. With the increase of the JRC or normal stress, the threshold values of the rock discontinuity increased, however the threshold value ratio decreased.
- rock discontinuity,
- roughness,
- cyclic shear loading,
- deformation characteristics,
- threshold value

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References(20)

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