|
|
|
| EXPERIMENTAL RESEARCH ON THERMAL CRACKING OF DEEP GRANITE IN BEISHAN REGION，GANSU PROVINCE |
| ZUO Jianping1，2，ZHOU Hongwei1，2，FANG Yuan2，MENG Bingbing2，PENG Ruidong1 |
(1. State Key Laboratory of Coal Resources and Safe Mining，China University of Mining and Technology，Beijing 100083，China；
2. School of Mechanics and Civil Engineering，China University of Mining and Technology，Beijing 100083，China) |
|
|
|
|
Abstract Full-digital hydraulic pressure and high temperature fatigue testing system with scanning electron microscope(SEM) is used to real-time observe and study thermal cracking of Beishan granite under different temperatures. Experimental results indicate that the threshold temperatures of thermal cracking of Beishan granite is 68 ℃–88 ℃. At the lower temperatures，intergranular thermal cracking is the main thermal cracking for Beishan granite. However，at the higher temperatures，transgranular cracking and coupling of intergranular and transgranular thermal cracking are the main cracking for Beishan granite. Beishan granite thermal cracking is not only effected by thermal expansion mismatch and thermal expansion anisotropy of minerals，but also effected by the physico-mechanical and thermal properties of mineral grains and mineral particle shape structures. Fluid inclusions within the granite may also effect the thermal cracking of Beishan granite，which is a new effect mechanism for thermal cracking. At microscopic and mesoscopic levels，thermal cracking has been classified；and different mechanisms for intergranular and transgranular thermal crackings can be quantitatively interpreted using the fractal models. When the temperature rises above 250 ℃，there is thermal melting effect in Beishan granite，which leads to a decrease in thermal cracking amount. The relationship between temperature and its corresponding thermal cracking amount fits Gauss curve well.
|
|
Received: 14 February 2011
|
|
|
|
| [1] 国家发展和改革委员会. 核电中长期发展规划(2005～2020年)[R]. 北京：[s.n.]，2007.(State Development and Reform Commission. Mid-long term development plan for nuclear power(between 2005 and 2020)[R]. Beijing：[s.n.]，2007.(in Chinese))
[2] http：//www.ocn.com.cn/free/201001/hedian091037.htm
[3] BOYLE W J. A potential high-level nuclear waste repository at Yucca Mountain，Nevada，USA[J]. International Society for Rock Mechanics News Journal，1999，6(1)：44–49.
[4] HEUZE F E. High-temperature mechanical，physical and thermal properties of granitic rocks—a review[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1983，20(1)：3–10.
[5] HEUECKEL T，PEANO A，PELLEGRINT R. A constitutive law for thermo plastic behavior of rocks：an analogy with clays[J]. Surveys in Geophys，1994，15(5)：643–671.
[6] BEHLAU J，MINGERZAHN G. Geological and tectonic investigations in the former Morsleben salt mine(Germany) as a basis for the safety assessment of radioactive waste repository[J]. Engineering Geology，2001，61(2/3)：83–97.
[7] 王 驹，范显华，徐国庆，等. 中国高放废物地质处置研究十年进展[M]. 北京：原子能出版社，2004：1–23.(WANG Ju，FANG Xianhua，XU Guoqing，et al. Geological disposal of high level radioactive waste in China：progress in the last decade[M]. Beijing：Atomic Energy Press，2004：1–23.(in Chinese))
[8] 中国岩石力学与工程学会废物地下处置专业委员会. 中国岩石力学与工程学会废物地下处置专业委员会成立大会暨首届学术交流大会论文集. 北京：[s. n.]，2006.(Chinese Underground Waste Disposal Committee of Chinese Society of Rock Mechanics and Engineering. Inaugural Conference of Chinese Underground Waste Disposal Committee of Chinese Society of Rock Mechanics and Engineering and the First Academic Exchange Conference. Beijing：[s. n.]，2006.(in Chinese))
[9] 中国岩石力学与工程学会废物地下处置专业委员会. 第二届废物地下处置学术研讨会论文集. 甘肃：[s. n.]，2008.(Chinese Underground Waste Disposal Committee of Chinese Society of Rock Mechanics and Engineering. Proceedings of the 2nd Academic Exchange Conference on Underground Waste Disposal. Gansu：[s. n.]，2008.(in Chinese))
[10] HUDSON J A. Lesson learned from 20 years of UK rock mechanics research for radioactive waste disposal[J]. International Society For Rock Mechanics News Journal，1999，6(1)：27–41.
[11] 刘月妙，王 驹，谭国焕，等. 高放废物处置北山预选区深部完整岩石基本物理力学性能及时温效应[J]. 岩石力学与工程学报，2007，26(10)：2 034–2 042.(LIU Yuemiao，WANG Ju，THAM L G，et al. Basic physico-mechanical properties and time-temperature effect of deep intact rock from Beishan pre-selected area for high-level radioactive waste disposal[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(10)：2 034–2 042.(in Chinese))
[12] ZUO J P，XIE H P，ZHOU H W. Experimental determination of the coupled thermal-mechanical effects on fracture toughness of sandstone[J]. Journal of Testing and Evaluation，2009，37(1)：48–52.
[13] 左建平，谢和平，周宏伟，等. 不同温度作用下砂岩热开裂的试验研究[J]. 地球物理学报，2007，50(4)：1 150–1 155.(ZUO Jianping，XIE Heping，ZHOU Hongwei，et al. Experimental research on thermal cracking of sandstone under different temperatures[J]. Chinese Journal of Geophysics，2007，50(4)：1 150–1 155.(in Chinese))
[14] ZUO J P，XIE H P，ZHOU H W，et al. Thermal-mechanical coupled effect on fracture mechanism and plastic characteristics of sandstone[J]. Science in China Series E：Technological Sciences，2007，50(6)：833–843.
[15] 陈 颙，吴晓东，张福勤. 岩石热开裂的试验研究[J]. 科学通报，1999，44(8)：880–883.(CHEN Yu，WU Xiaodong，ZHANG Fuqin. Experimental research on rock thermal cracking[J]. Chinese Science Bulletin，1999，44(8)：880–883.(in Chinese))
[16] 张 渊，张 贤，赵阳升. 砂岩的热破裂过程[J]. 地球物理学报，2005，48(3)：656–659.(ZHANG Yuan，ZHANG Xian，ZHAO Yangsheng. Process of sandstone thermal cracking[J]. Chinese Journal of Geophysics，2005，48(3)：656–659.(in Chinese))
[17] XIE H P. Fractals in rock mechanics[M]. Netherlands：Balkema Publishers，1993：187–198.
[18] WANG H F，BONNER B P，CARLSON S R，et al. Thermal stress cracking in granite[J]. Journal of Geophysical Research，1989，94(B2)：1 745–1 758.
[19] ZUO J P，XIE H P，ZHOU H W，et al. SEM in-situ investigation on thermal cracking behavior of Pingdingshan sandstone at elevated temperatures[J]. Geophysical Journal International，2010，181(2)：593–603. |
|
|
|
2011, Vol. 30 
