Development of an Automated Servo-Controlled Apparatus for Accurate Direct Shear Testing of Rock Joints under Different Boundary Conditions

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Babanouri Nima; Karimi Nasab Saeed

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Journal Paper

Paper Information

Journal: JOURNAL OF ANALYTICAL AND NUMERICAL METHODS IN MINING ENGINEERING Year:2019 | Volume:9 | Issue:18 Page(s): 143-152

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Title

Development of an Automated Servo-Controlled Apparatus for Accurate Direct Shear Testing of Rock Joints under Different Boundary Conditions

Author(s)

Babanouri Nima | Karimi Nasab Saeed | Issue Writer Certificate

Keywords

Mechanical behavior of rock joints

Direct shear test

Servo-controlled equipment

Constant normal load

Constant normal stiffness

Abstract

Summary: In this paper, an automated and servo-controlled apparatus is introduced which is capable of accurately conducting shear tests under different boundary conditions including Constant normal load and Constant normal stiffness. Introduction: Precise and accurate measurement of shear strength of rock joints is of great importance in various projects related to rock engineering such as tunnels, dams, surface and underground mining, and oil shafts. In the laboratory, Mechanical behavior of rock joints is studied by Direct shear testing equipment. Manually controlled devices of Direct shear testing are not adequately accurate. In this paper, development of an automated and servo-controlled device for Direct shear testing of rock joints has been described. Methodology and Approaches: The developed apparatus performs monotonic and cyclic shear tests with different rates. It also allows the correction of the involved area with shear displacement and adjusting the normal load accordingly. In addition to the possibility of terminating the experiment manually, conditions can be set in terms of the test duration, shear displacement, shear stress drop, or their combination to stop the experiment automatically. The data acquired by the displacement and load sensors are constantly transmitted to a personal computer connected to the device, and online graphs can be monitored during the experiment. Furthermore, some measures have been considered to remove sample clearance inside the shear box. Results and Conclusions: Finally, the results of a number of Direct shear tests carried out by the apparatus on the joints of known surface morphological characteristics are presented.

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APA: Copy

Babanouri, Nima, & Karimi Nasab, Saeed. (2019). Development of an Automated Servo-Controlled Apparatus for Accurate Direct Shear Testing of Rock Joints under Different Boundary Conditions. JOURNAL OF ANALYTICAL AND NUMERICAL METHODS IN MINING ENGINEERING, 9(18 ), 143-152. SID. https://sid.ir/paper/266092/en

Vancouver: Copy

Babanouri Nima, Karimi Nasab Saeed. Development of an Automated Servo-Controlled Apparatus for Accurate Direct Shear Testing of Rock Joints under Different Boundary Conditions. JOURNAL OF ANALYTICAL AND NUMERICAL METHODS IN MINING ENGINEERING[Internet]. 2019;9(18 ):143-152. Available from: https://sid.ir/paper/266092/en

IEEE: Copy

Nima Babanouri, and Saeed Karimi Nasab, “Development of an Automated Servo-Controlled Apparatus for Accurate Direct Shear Testing of Rock Joints under Different Boundary Conditions,” JOURNAL OF ANALYTICAL AND NUMERICAL METHODS IN MINING ENGINEERING, vol. 9, no. 18 , pp. 143–152, 2019, [Online]. Available: https://sid.ir/paper/266092/en

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