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Minghui Li is a Professor at College of Civil and Transportation Engineering, Shenzhen University, China. He obtained his Ph.D. in Mining Engineering from Chongqing University in 2016. He serves as the vice director of the Guangdong Provincial Key Laboratory of Deep Earth Science and Geothermal Energy Exploitation and Utilization. His main research interests include rock deformation and fracture mechanisms, fluid seepage mechanisms under complex stress conditions, and the prevention and control of dynamic disasters in deep engineering. He has led projects such as the National Key Research and Development Program (Youth Scientist Project), the National Natural Science Foundation of China, and a sub-project of the National Deep Earth Major Program. He has published over 100 academic papers with an H-index of 34 (WOS).
Outline
Investigating the mechanical behavior and microstructural evolution of granite under high temperatures is crucial for optimizing fracturing strategies and ensuring reservoir sustainability in enhanced geothermal systems (EGS) at the Qiabuqia geothermal field, China. This study conducted triaxial compression tests on granite from the Qinghai Gonghe Basin under temperature from 25 ℃ to 300 ℃, examining the effects of temperature and confining pressure on the mechanical properties and energy evolution of the granite. Additionally, X-ray diffraction (XRD) analysis and nanoindentation tests were employed to assess changes in micro-mechanical properties and mineral compositions. Furthermore, fracture mechanics principles, incorporating thermal stress effects, were utilized to calculate the initiation pressure of reservoirs at an engineering scale for geothermal development in the Qinghai Gonghe Basin. The results indicate that the compressive strength and elastic modulus of Gonghe granite increase with temperature up to 200 ℃ due to the enhancement of mineral mechanical properties and thermal densification, but significantly decrease at 300 ℃ due to thermal damage and fracture propagation. Energy analysis reveals that the granite undergoes a transition from brittle to ductile behavior under high-temperature conditions. The proportion of energy dissipation during deformation increases with temperature. The increased proportion of quartz, coupled with its high thermal expansion coefficient and elastic modulus, generates intense thermal stress at the interfaces between quartz and adjacent minerals. The development and propagation of transgranular fractures around quartz are critical factors influencing the macroscopic mechanical properties of granite. This study provides a good understanding of the effects of high temperature on granite performance and its engineering significance in reservoir development, emphasizing the role of thermal stress in reducing fracturing pressure and promoting fracture propagation.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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