Static uniaxial compression tests were conducted on 16 granite specimens after thermal treatment using a heating device and an electro-hydraulic servo pressure-testing machine.The effects of air cooling and water cooling on the physical and mechanical properties of the high-temperature granite specimens were studied.Test results showed that the longitudinal wave velocities of the high-temperature specimens gradually decreased after they were cooled by water and air.The peak stress and elastic modulus of the samples decreased gradually with an increase in temperature,whereas their peak strain increased gradually.The effects of peak stress and peak strain were considerably more evident when cooling by water than by air.This result demonstrated that the thermal cracking of the granite specimens,and consequently,their internal micro-fractures,further developed when the specimens were cooled by water.
Abstract
Static uniaxial compression tests were conducted on 16 granite specimens after thermal treatment using a heating device and an electro-hydraulic servo pressure-testing machine.The effects of air cooling and water cooling on the physical and mechanical properties of the high-temperature granite specimens were studied.Test results showed that the longitudinal wave velocities of the high-temperature specimens gradually decreased after they were cooled by water and air.The peak stress and elastic modulus of the samples decreased gradually with an increase in temperature,whereas their peak strain increased gradually.The effects of peak stress and peak strain were considerably more evident when cooling by water than by air.This result demonstrated that the thermal cracking of the granite specimens,and consequently,their internal micro-fractures,further developed when the specimens were cooled by water.
关键词
granite /
high temperature effect /
cooling method /
mechanical properties
Key words
granite /
high temperature effect /
cooling method /
mechanical properties
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
Du S J,Ma M,Chen H H,et al. 2003. Testing study on longi-tudinal wave characteristics of granite after high tempera-ture. Chinese Journal ofRock Mechanics and Engineering, 22(11):1805-1806. (in Chinese with English abstract)
Li X B,Yao J R,Gong F Q. 2011. Dynamic problems in deep exploitation of hard rock metal mines. The Chinese Journal of Nonferrous Metals, 21(10):2551-2563. (in Chinese with English abstract)
Qin Y. 2017. High-temperature influence on physical and me-chanical properties of diorite:master's degree thesis. Bei-jing:China University of Geosciences. (in Chinese with English abstract)
Xi B P, Zhao Y S. 2010. Experimental research on mechanical properties of water-cooled granite under temperatures with 600℃. Chinese Journal ofRock Mechanics and Engineer-ing, 29(5):892-898. (in Chinese with English abstract)
Xi B P. 2009. Study on stability of drilling surrounding rock system under thermo-flow-solid multi-field coupling effect:doctor's degree thesis. Taiyuan:Taiyuan University of Technology. (in Chinese with English abstract)
Xiong L X,Yu L J. 2018. Advances of mechanical properties of rock under high temperature and after high temperature. Journal ofGeological Hazards and Environment Preserva-tion, 29(1):76-82. (in Chinese with English abstract)
Xu X L,Gao F, Zhang Z Z. 2014. Influence of confining pres-sure on de-formation and strength properties of granite after high temperatures. Chinese Journal ofGeotechnical En-gineering, 36(12):2246-2252. (in Chinese with English abstract)
Yang J L,Hu K. 2001. Overview of research and development techniques for Hot Dry Rock (HDR) resources. Global Geology, 20(1):43-51. (in Chinese with English abstract)
Yin T B,Shu R H,Li X B,et al. 2016. Comparison of mechan-ical properties in high temperature and thermal treatment granite. Transactions ofNonferrous Metals Society of China, 26(7):1926-1937.
Zhang W Q. 2017. Study on the microscopic mechanism of rock thermal damage and the evolution characteristics of macroscopic physical and mechanical properties-taking typical rock as an example:doctor's degree thesis. Xuzhou:China University of Mining and Technology. (in Chinese with English abstract)
基金
Supported by "The Training Plan of College Students' Creation" (2017A53449) in Jilin University,New Energy Item of Jilin Province Combining with Universities (SF2017-5-5).
PDF(567 KB)
