Fracture characteristics and pore connectivity of sandstone under thermal shock

YANG Xin-xin; XI Bao-ping; HE Shui-xin; DONG Yun-sheng; XIN Guo-xu

doi:10.11779/CJGE202210019

Volume 44 Issue 10

Turn off MathJax

Article Contents

Abstract

References

Chinese Journal of Geotechnical Engineering > 2022 > 44(10): 1925-1934. > DOI: 10.11779/CJGE202210019

YANG Xin-xin, XI Bao-ping, HE Shui-xin, DONG Yun-sheng, XIN Guo-xu. Fracture characteristics and pore connectivity of sandstone under thermal shock[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(10): 1925-1934. DOI: 10.11779/CJGE202210019

Citation:

PDF (5473 KB)

Fracture characteristics and pore connectivity of sandstone under thermal shock

1.
College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2.
Key Laboratory of Insitu Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China

More Information

Received Date: August 22, 2021
Available Online: December 11, 2022

Graphical Abstract

Abstract

Abstract

To study the fracture characteristics and damage laws of high-temperature sandstone under thermal shock in water after cooling, the micro-CT technique is used to analyze the meso-pore cracks of sandstone at 600℃ under thermal shock after cooling in water at different temperatures. The relationship between the temperature of cooling medium and the pore development is analyzed, and the developing trend of fractal dimension of the pores is investigated. The results show that after the thermal shock treatment of high-temperature sandstone, a large number of new pores sprout, and the throat is generated in the fragile place between the pores and gradually develops and expands. Eventually, a large number of pores are connected to form pore clusters. With the decrease of the temperature of the cooling medium, the volume of the connected clusters increases, the permeability increases, and the damage degree increases. The volume fraction of the pores of sandstone is linearly and positively correlated with the fractal dimension. The larger the volume fraction of the pores, the larger the fractal dimension, and the more severe the damage of sandstone. The fractal dimension can be used to characterize the damage degree of sandstone. The pores and fracture characteristics of granite, limestone and sandstone at 600℃ are quite different under thermal shock after cooling in water. The granite is characterized by obvious brittle fracture, for the sandstone, the pore development is obvious, and for the limestone, there are pores and fractures.
- sandstone,
- thermal shock,
- CT scanning,
- pore-connected cluster,
- fractal dimension,
- permeability

FullText(HTML)

References (23)

References

[1]	LIDMAN W G, BOBROWSKY A R. Correlation of physical properties of ceramic materials with resistance to fracture by thermal shock[C]// Proceedings of the National Advisory Committee for Aeronautics, NACA research memorandum and Lewis Flight Propulsion Laboratory. Washington D C: National Advisory Committee for Aeronautics, 1949: 1.
[2]	赵阳升, 万志军, 康建荣. 高温岩体地热开发导论[M]. 北京: 科学出版社, 2004. ZHAO Yang-sheng, WAN Zhi-jun, KANG Jian-rong. Introduction to Geothermal Extraction in Hot Dry Rock[M]. Beijing: Science Press, 2004. (in Chinese)
[3]	郤保平, 吴阳春, 王帅, 等. 热冲击作用下花岗岩力学特性及其随冷却温度演变规律试验研究[J]. 岩土力学, 2020, 41(增刊1): 83–94. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX2020S1010.htm XI Bao-ping, WU Yang-chun, WANG Shuai, et al. Evolution of mechanical properties of granite under thermal shock in water with different cooling temperatures[J]. Rock and Soil Mechanics, 2020, 41(S1): 83–94. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX2020S1010.htm
[4]	郤保平, 吴阳春, 赵阳升, 等. 不同冷却模式下花岗岩强度对比与热破坏能力表征试验研究[J]. 岩石力学与工程学报, 2020, 39(2): 286–300. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX202002009.htm XI Bao-ping, WU Yang-chun, ZHAO Yang-sheng, et al. Experimental investigations of compressive strength and thermal damage capacity characterization of granite under different cooling modes[J]. Chinese Journal of Rock Mechanics and Engineering, 2020, 39(2): 286–300. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX202002009.htm
[5]	郤保平, 吴阳春, 王帅, 等. 青海共和盆地花岗岩高温热损伤力学特性试验研究[J]. 岩石力学与工程学报, 2020, 39(1): 69–83. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX202001007.htm XI Bao-ping, WU Yang-chun, WANG Shuai, et al. Experimental study on mechanical properties of granite taken from Gonghe Basin, Qinghai Province after high temperature thermal damage[J]. Chinese Journal of Rock Mechanics and Engineering, 2020, 39(1): 69–83. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX202001007.htm
[6]	郤保平, 吴阳春, 赵阳升. 热冲击作用下花岗岩宏观力学参量与热冲击速度相关规律试验研究[J]. 岩石力学与工程学报, 2019, 38(11): 2194–2207. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX201911005.htm XI Bao-ping, WU Yang-chun, ZHAO Yang-sheng. Experimental study on the relationship between macroscopic mechanical parameters of granite and thermal shock velocity under thermal shock[J]. Chinese Journal of Rock Mechanics and Engineering, 2019, 38(11): 2194–2207. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX201911005.htm
[7]	贺玉龙, 杨立中. 温度和有效应力对砂岩渗透率的影响机理研究[J]. 岩石力学与工程学报, 2005, 24(14): 2420–2427. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX200514004.htm HE Yu-long, YANG Li-zhong. Mechanism of effects of temperature and effective stress on permeability of sandstone[J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(14): 2420–2427. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX200514004.htm
[8]	周青春. 温度、孔隙水和应力作用下砂岩的力学特性研究[D]. 北京: 中国科学院研究生院, 2006. ZHOU Qing-chun. Study on the Mechanical Property of A Sandstone under Geothermal-Mechanical and Hydraulic-Mechanical Coupling[D]. Beijing: Chinese Academy of Sciences, 2006. (in Chinese)
[9]	苏承东, 付义胜. 红砂岩三轴压缩变形与强度特征的试验研究[J]. 岩石力学与工程学报, 2014, 33(增刊1): 3164–3169. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX2014S1080.htm SU Cheng-dong, FU Yi-sheng. Experimental study of triaxial compression deformation and strength characteristics of red sandstone[J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33(S1): 3164–3169. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX2014S1080.htm
[10]	LOWELL S, SHIELDS J E, THOMAS M A, et al. Other Surface Area Methods[M]// Characterization of Porous Solids and Powders: Surface Area, Pore Size and Density. Dordrecht: Springer Netherlands, 2004: 82–93.
[11]	BAKKE S, ØREN P E. 3-D pore-scale modelling of sandstones and flow simulations in the pore networks[J]. SPE Journal, 1997, 2(2): 136–149.
[12]	ATTWOOD D. Nanotomography comes of age[J]. Nature, 2006, 442(7103): 642–643.
[13]	SAKDINAWAT A, ATTWOOD D. Nanoscale X-ray imaging[J]. Nature Photonics, 2010, 4(12): 840–848.
[14]	赵阳升, 孟巧荣, 康天合, 等. 显微CT试验技术与花岗岩热破裂特征的细观研究[J]. 岩石力学与工程学报, 2008, 27(1): 28–34. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX200801005.htm ZHAO Yang-sheng, MENG Qiao-rong, KANG Tian-he, et al. Micro-ct experimental technology and meso-investigation on thermal fracturing characteristics of granite[J]. Chinese Journal of Rock Mechanics and Engineering, 2008, 27(1): 28–34. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX200801005.htm
[15]	LIU H, YANG G S, YUN Y H, et al. Investigation of sandstone mesostructure damage caused by freeze-thaw cycles via CT image enhancement technology[J]. Advances in Civil Engineering, 2020, 2020: 8875814.
[16]	戎虎仁, 白海波, 王占盛. 不同温度后红砂岩力学性质及微观结构变化规律试验研究[J]. 岩土力学, 2015, 36(2): 463–469. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201502026.htm RONG Hu-ren, BAI Hai-bo, WANG Zhan-sheng. Experimental research on mechanical properties and microstructure change law of red sandstone after different temperatures[J]. Rock and Soil Mechanics, 2015, 36(2): 463–469. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201502026.htm
[17]	JIN P H, HU Y Q, SHAO J X, et al. Influence of temperature on the structure of pore–fracture of sandstone[J]. Rock Mechanics and Rock Engineering, 2020, 53(1): 1–12.
[18]	金爱兵, 王树亮, 魏余栋, 等. 不同冷却条件对高温砂岩物理力学性质的影响[J]. 岩土力学, 2020, 41(11): 3531–3539, 3603. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX202011004.htm JIN Ai-bing, WANG Shu-liang, WEI Yu-dong, et al. Effect of different cooling conditions on physical and mechanical properties of high-temperature sandstone[J]. Rock and Soil Mechanics, 2020, 41(11): 3531–3539, 3603. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX202011004.htm
[19]	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. https://www.cnki.com.cn/Article/CJFDTOTAL-DQWX200503024.htm ZHANG Yuan, ZHANG Xian, ZHAO Yang-sheng. Process of sandstone thermal cracking[J]. Chinese Journal of Geophysics, 2005, 48(3): 656–659. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-DQWX200503024.htm
[20]	张渊, 万志军, 赵阳升. 细砂岩热破裂规律的细观实验研究[J]. 辽宁工程技术大学学报, 2007, 26(4): 529–531. https://www.cnki.com.cn/Article/CJFDTOTAL-FXKY200704014.htm ZHANG Yuan, WAN Zhi-jun, ZHAO Yang-sheng. Meso-experiment of fine sandstone thermal crack laws[J]. Journal of Liaoning Technical University, 2007, 26(4): 529–531. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-FXKY200704014.htm
[21]	于艳梅, 胡耀青, 梁卫国, 等. 应用CT技术研究瘦煤在不同温度下孔隙变化特征[J]. 地球物理学报, 2012, 55(2): 637–644. https://www.cnki.com.cn/Article/CJFDTOTAL-DQWX201202026.htm YU Yan-mei, HU Yao-qing, LIANG Wei-guo, et al. Study on pore characteristics of lean coal at different temperature by CT technology[J]. Chinese Journal of Geophysics, 2012, 55(2): 637–644. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-DQWX201202026.htm
[22]	王登科, 张平, 浦海, 等. 温度冲击下煤体裂隙结构演化的显微CT实验研究[J]. 岩石力学与工程学报, 2018, 37(10): 2243–2252. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX201810005.htm WANG Deng-ke, ZHANG Ping, PU Hai, et al. Experimental research on cracking process of coal under temperature variation with industrial micro-CT[J]. Chinese Journal of Rock Mechanics and Engineering, 2018, 37(10): 2243–2252. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX201810005.htm
[23]	杨更社, 刘慧. 基于CT图像处理的冻结岩石细观结构及损伤力学特性[M]. 北京: 科学出版社, 2016. YANG Geng-she, LIU Hui. Microstructure and Damage Mechanical Characteristics of Frozen Rock Based on CT Image Processing[M]. Beijing: Science Press, 2016. (in Chinese)