Abstract
Studying the dynamic performance of rocks affected by high temperatures is a crucial theoretical foundation of mining engineering design and the construction of deep metallic mineral resources. More importantly, such studies can provide technical support for the green and low-carbon mining of these resources. However, systematic studies on the dynamic mechanical properties of rocks affected by both confining pressure and temperature during the mining of deep metallic mineral resources are lacking. Therefore, systematic research was conducted on the dynamic mechanical properties of limestone under confining pressure after high-temperature treatment, and a corresponding constitutive model was established. In this study, limestones were heated to 200 °C, 400 °C, 600 °C, and 800 °C, and the Split Hopkinson Pressure Bar impact test was conducted with confining pressures of 0.0 MPa, 0.5 MPa, 1.5 MPa, and 2.5 MPa. The test results show that the temperature has a significant effect on the dynamic compressive strength of limestone, and as the temperature rises, the strength tends to first increase and then decrease, reaching the turning point at a temperature of 400 °C. The dynamic compressive strength increases as the confining pressure increases. The constitutive equation of the dynamic damage to limestone under confining pressure after high-temperature treatment is consistent with the test results. Therefore, the established constitutive model can represent the dynamic behavior of limestone, providing a reference for evaluating the dynamic performance of this material, and serving as a theoretical basis for the green and low-carbon mining of deep metallic mineral resources.
Highlights
With the depletion of shallow mineral resources, the mining depth for extracting underground metallic and non-metallic minerals has been growing [1]
The continuous development of the Split Hopkinson Pressure Bar (SHPB) experimental technique has resulted in its wide application to the study of dynamic mechanical properties [5,6,7] and constitutive equations [8,9] of materials
In order to explore the influence of confining pressure and temperature damage on the dynamic mechanical properties of limestone specimens, the specimens were subjected to different temperatures and different confining pressures at loading impact velocities of
Summary
With the depletion of shallow mineral resources, the mining depth for extracting underground metallic and non-metallic minerals has been growing [1]. Yin Tubing [14] developed a new experimental system and utilized it to conduct SHPB testing on siltstone under the coupling effect of temperature and pressure. In the process of deep underground mining and underground engineering construction, the strength evaluation, stability control, and engineering design of an engineering rock mass subjected to high stress from the surrounding rock need to consider the physical and mechanical properties of rock blocks, and the influence of confining pressure on its mechanical properties. Few studies have used constitutive equations, which are more suitable for actual deep rock and soil engineering, to research dynamic mechanical properties under the combined effects of high temperature and confining pressure.
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