Mechanical Properties and Acoustic Emission Characteristics of the Bedrock of a Hydropower Station under Cyclic Triaxial Loading

2020 ◽  
Vol 53 (11) ◽  
pp. 5203-5221
Author(s):  
Xiang-Yi Zhu ◽  
Xu-Dong Chen ◽  
Feng Dai
Keyword(s):  
Mechanical Properties ◽  
Acoustic Emission ◽  
Hydropower Station ◽  
Emission Characteristics ◽  
Cyclic Triaxial ◽  
Triaxial Loading

scholarly journals Research on mechanical properties and acoustic emission characteristics of rock beams with different lithologies and thicknesses

2021 ◽  
Vol 18 (8) ◽  
Author(s):  
Tong-bin Zhao ◽  
Peng-fei Zhang ◽  
Wei-yao Guo ◽  
Ya-xun Xiao ◽  
Yong-qiang Zhao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Acoustic Emission ◽  
Emission Characteristics

scholarly journals Research on Coal Mechanical Properties Based on True Triaxial Loading and Unloading Experiment

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Yanyan Peng ◽  
Haoxiang Deng ◽  
Minghong Xing ◽  
Pengfei Guo ◽  
Chun Zhu
Keyword(s):  
Mechanical Properties ◽  
Acoustic Emission ◽  
Principal Stress ◽  
Coal Mine ◽  
Test System ◽  
Intermediate Principal Stress ◽  
Mine Safety ◽  
Triaxial Loading ◽  
True Triaxial ◽  
Loading And Unloading

To study the safety issues caused by coal mine excavation, self-developed simulation of earth interior atmosphere and sound test system was used to perform true triaxial loading and unloading tests of coal. An acoustic emission detection system was used to record the damage evolution trend of coal under different intermediate principal stress states. The experimental results show that in the true triaxial unloading test, as the intermediate principal stress increases, the failure state of coal changes from shear failure to partial shear tension failure, finally leading to overall yield failure. In the stress-strain curves, with the increase in intermediate principal stress, the strain in the direction of intermediate principal stress gradually changes from compression to expansion, and typical expansion occurs. The Mogi–Coulomb strength criterion better reflects the strength failure characteristics of coal during unloading. The stress-acoustic emission diagrams show that the increase in intermediate principal stress causes the internal cracks of the coal to grow unsteadily and exponentially, and the increase in intermediate principal stress makes the coal lose its ability to continue to bear the load. Studying the influence of the intermediate principal stress on the mechanical properties of coal has practical significance for coal mine safety production.

scholarly journals Experimental Study on Mechanical Properties and Acoustic Emission Characteristics of Water Bearing Sandstone under Stable Cyclic Loading and Unloading

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Xinzhan Qin ◽  
Yu Zhou ◽  
Manchao He
Keyword(s):  
Mechanical Properties ◽  
Acoustic Emission ◽  
Cyclic Loading ◽  
Water Content ◽  
Coal Mines ◽  
Surrounding Rock ◽  
Emission Characteristics ◽  
Cyclic Loading And Unloading ◽  
Loading And Unloading ◽  
Pumped Storage

Due to the adjustment of energy structure, a large number of coal mines are abandoned. Considering the environmental and economic effects, many experts proposed to use the abandoned mine cavern as the reservoir of the pumped storage power station. Furthermore, considering the long-term effects of repeated pumping and drainage and hydrodynamic pressure on the surrounding rock in coal mines, a large amount of sandstone was collected from the Ruineng coal mine in Yan’an city to carry out a series of laboratory tests. Through uniaxial compression testing of rock samples with different water content rates, combined with acoustic emission (AE) analysis, the strength softening and macrodeformation characteristics are obtained, and the influence of water content on acoustic emission characteristics is clarified. The mechanical properties of water bearing rock under cyclic loading and unloading experiments with varying upper limits are obtained using a triaxial test system, and the precursory information of rock failure is captured, providing significant guidance for stability analysis and instability warning for surrounding rock in pumped storage power stations.

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