Experimental Research on Mechanical and Energy Characteristics of Reinforced Rock under Dynamic Loading

Abstract

The properties of anchored surrounding rock may vary considerably under complex geological and stress conditions, especially dynamic loading in deep mining. Therefore, comprehensive study of the reinforced mechanism is required to prevent failures associated with deep mining. In this paper, with sandstone as matrix and steel bar as bolt, the dynamic compression test of reinforced rock was carried out by using a 50 mm rod diameter split Hopkinson pressure bar (SHPB) test device. The mechanical and energy characteristics of reinforced rock under dynamic loading were analyzed. The results show that the dynamic strength of reinforced sample is greater than that of unreinforced sample and increases with the increase of the strain rate. The reflected energy and absorbed energy increase with the increase of incident energy, while the transmitted energy increases slightly. The higher the strain rate, the larger the energy dissipation rate and the higher the degree of fragmentation. It shows that the energy dissipation characteristic reflects the internal damage process to some extent. Compared with the results of unreinforced samples, the reflected energy of reinforced samples significantly increases and the absorbed energy will significantly decrease. It can be seen that the bolt can reduce absorbed energy of surrounding rock, thereby improving the stability of roadway surrounding rock. The results may provide reference for the stability of deep roadway and support design.

Analysis the Characteristic of Energy and Damage of Coal-Rock Composite Structure Under Cycle Loading

“…The coal-rock composite system is accompanied by energy accumulation, transformation, and release in the process of damage and failure (Yu et al, 2020;Liu et al, 2019;Pan et al, 2020;Gao et al, 2020). Therefore, studying the characteristic of energy and damage of the coal-rock composite system under cyclic loading is of great significance to preventing coal mine disasters.…”

Energy Dissipation and Electromagnetic Radiation Response of Sandstone Samples with a Pre-Existing Crack of Various Inclinations under an Impact Load

“…Li [11] and Huang [12] both conducted impact dynamics experiments on samples and believed that the energy dissipation density increased with the increase in the fractal dimension. Liu [13] believed that as the strain rate gradually increased, the energy dissipation rate increased, which can reflect the degree of fracture of the sample to a certain extent.…”

Experimental Investigation on the Energy Storage Characteristics of Red Sandstone in Triaxial Compression Tests with Constant Confining Pressure

“…Energy conversion is an essential characteristic of material physical processes, which runs through all stages of rock or rock mass deformation [19][20][21]. e energy storage, dissipation, and release during the rock deformation process are closely related to the damage state [19,[22][23][24][25][26][27][28][29][30][31][32]. erefore, it is necessary to study the internal mechanism of rock deformation from the perspective of energy storage and dissipation.…”

“…Although the energy analysis method has been widely applied to the field of rock deformation mechanism and engineering owing to the superiority of making up the shortcomings of classical elastoplastic mechanics theory [31][32][33][34][35], there are few studies which focus on the relationships of elastic energy density, dissipative energy density, and input energy density under triaxial compression in the aforementioned works. It is necessary to study the energy storage and dissipation in the process of rock deformation.…”