Abstract
Thermal shock (TS) is known as the process where fractures are generated when rocks go through sudden temperature changes. In the field of deep rock engineering, the rock mass can be subjected to the TS process in various circumstances. To study the influence of TS on the mechanical behaviors of rock, sandstone specimens are heated at different high temperatures and three cooling methods (stove cooling, air cooling, and freezer cooling) are adopted to provide different cooling rates. The coupled dynamic and static loading tests are performed on the heated sandstone through a modified split Hopkinson pressure bar (SHPB) system. The influence of heating level and cooling rate on the dynamic compressive strength, energy dissipations, and fracturing characteristics is investigated based on the experimental data. The development of the microcracks of the sandstone specimens after the experiment is analyzed utilizing a scanning electron microscope (SEM). The extent of the development of the microcracks serves to explain the variation pattern of the mechanical responses and energy dissipations of the specimens obtained from the loading test. The findings of this study are valuable for practices in rock engineering involving high temperature and fast cooling.
Highlights
With the rapid development of human society, the world’s demand for energy sources is continuously growing, and the gradual depletion of shallow mineral resources leads to the inevitable trend of exploitation into the deep strata [1,2]
The deep rock mass is commonly subjected to undesirable conditions including high temperature, high in-situ stress, and dynamic disturbance, which is different from the circumstances encountered in shallow strata [3,4,5,6]
In deep rock engineering applications such as oil exploitation and geothermal development, the rock mass at a high temperature can experience rapid temperature drops induced by cryogenic liquid [7]
Summary
With the rapid development of human society, the world’s demand for energy sources is continuously growing, and the gradual depletion of shallow mineral resources leads to the inevitable trend of exploitation into the deep strata [1,2]. The deep rock mass is commonly subjected to undesirable conditions including high temperature, high in-situ stress, and dynamic disturbance, which is different from the circumstances encountered in shallow strata [3,4,5,6]. In deep rock engineering applications such as oil exploitation and geothermal development, the rock mass at a high temperature can experience rapid temperature drops induced by cryogenic liquid [7]. The rapid temperature change can induce thermal stress and lead to cracks in the rock, which is referred to as thermal shock (TS) [10]. Some results have been reported with respect to the variation patterns of the physical and mechanical properties of rocks under the influence of different TS treatments [11,12,13]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
