A multifunctional rock testing system for rock failure analysis under different stress states: Development and application
Journal of Rock Mechanics and Geotechnical Engineering, vol. 14, pp. 1531–1544
Abstract
The stress state in a rock mass is complex. Stress redistribution around underground excavation may lead to various failure modes, including compressive-shear, tensile-shear, and tensile failures. The ability to perform laboratory tests with these complex stress states is significant for establishing new strength criteria. The present paper introduces a new rock testing system with “tensile-compressive-shear” loading functions. The device includes bi-directional and double-range hydraulic cylinders, auxiliary loading equipment, and roller rows that can perform direct compressive-shear tests, direct tensile tests, and direct tensile-shear tests. The testing system provides maximum vertical and lateral loading forces of 2000 kN and allows testing cubical rock specimens with dimensions of 0.5 m × 0.5 m × 0.5 m. The performance of the testing machine was evaluated by testing a rock-like material based on cement mortar under compressive-shear, tensile, and tensile-shear stress states. The failure process and deformation characteristics were monitored during loading using acoustic emission (AE) transient recorder, piezoelectric AE sensors, a high-speed camera, and a thermal infrared camera. The failure mechanism was investigated by analyzing AE counts, AE amplitude, strain, and temperature changes on the rock specimen surface. The test results confirmed that the testing system could successfully simulate the abovementioned stress path. The AE counts and amplitude responses were influenced by different failure modes. The temperature response during the compressive-shear test indicated the development of a high-temperature band on the rock specimen surface. In contrast, a negligible temperature change was observed during the tensile and tensile-shear tests. The newly developed multifunctional rock testing system allows laboratory tests under various failure modes. The monitoring results of multiple variables during rock failure tests provide valuable information on failure characteristics.
Authors 7
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Shucai Li corresponding
Affiliation as printed
School of Qilu Transportation, Shandong University, Jinan, 250061, China
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Nanjing Tech University · Shandong University · Nanjing University of Science and Technology · RWTH Aachen University
Affiliation as printed
Department of Engineering Geology and Hydrogeology, RWTH Aachen University, Aachen, 52064, Germany
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
School of Qilu Transportation, Shandong University, Jinan, 250061, China
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Affiliation as printed
Department of Engineering Geology and Hydrogeology, RWTH Aachen University, Aachen, 52064, Germany
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Affiliation as printed
School of Qilu Transportation, Shandong University, Jinan, 250061, China
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Affiliation as printed
School of Qilu Transportation, Shandong University, Jinan, 250061, China
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Affiliation as printed
School of Qilu Transportation, Shandong University, Jinan, 250061, China
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Affiliation as printed
Department of Engineering Geology and Hydrogeology, RWTH Aachen University, Aachen, 52064, Germany
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