article · Geomechanics and Geophysics for Geo-Energy and Geo-Resources
This study investigated how high differential stress and high temperatures affect the mechanical behaviour and rockburst proneness of granite, particularly relevant for deep-buried high-temperature tunnels. Using true triaxial compression tests, the research revealed that granite's strength, failure mechanisms, and rockburst proneness are significantly influenced by these conditions. High temperatures extend the strengthening effect of intermediate principal stress on the granite's peak strength. As both temperature and differential stress increase, secondary vertical cracks develop rapidly, leading to macroscopic failure. Under high temperatures, granite's failure mode shifts from compressive-shear to tensile-shear at low differential stress. The combination of high temperature and high differential stress was found to increase rockburst proneness by approximately 1.14 times.
Understanding how deep geological conditions, such as high temperatures and stresses, impact rock stability is crucial for safety. This research provides insights into the mechanical behaviour and rockburst risk of granite in deep engineering projects, helping to prevent disasters and ensure the safe construction and operation of structures like high geothermal tunnels.
The findings are directly applicable to the safe construction and disaster assessment of deep-buried high geothermal tunnels. This research provides critical data for engineers and construction companies to better predict and mitigate rockburst risks in such challenging environments. It represents applied research, contributing to improved safety protocols and design standards for deep underground infrastructure projects, potentially leading to more resilient and safer tunnel designs.
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Complicated geological conditions such as high geo-stress and high ground temperatures often have a significant impact on the mechanical behavior and failure potential of hard rocks in deep engineering. This study aims to investigate the mechanical behaviors and rockburst proneness of granite under high differential stress and high temperatures in deep-buried high-temperature tunnels. A comprehensive experimental study was conducted on the coupling behavior of granite under high-temperature and high differential stress by true triaxial compression tests. The strength and failure mechanism of granite as well as their relationship with high temperature and high differential stress were revealed. The rockburst proneness of granite from a deep-buried high geothermal tunnel was assessed based on the rock's ultimate energy storage characteristics. It shows the strength, failure mechanisms, and rockburst proneness of granite, are significantly correlated to the granite high-temperature high-stress conditions. The temperatures extend the strengthening range of the intermediate principal stress on the true triaxial peak strength of the granite. With increasing temperature and differential stress, secondary vertical cracks develop quickly to induce the macroscopic failure of granite. Under high temperatures, the failure of granite changes from compressive-shear failure to tensile-shear failure at low differential stress. High temperature coupled with high differential stress strengthens approximately 1.14 times the rockburst proneness of granite. The results are important for the safe construction, and disaster assessment of deep-buried high geothermal tunnels.
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DOI: 10.1007/s40948-024-00891-6
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