Experimental investigation on the mechanical behavior of red sandstone under the coupled effects of temperature and acidic etching
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The red sandstone that commonly exists in nature is used to study the coupled effects of temperature and acidic etching on its mechanical properties. The dry-wet cycle is adopted to accelerate the corrosion process during the test, and the increase in the number of dry-wet cycle indicates the increase of the degree of corrosion. A series of uniaxial compression tests were carried out, and the influence of dry-wet cycle times on the physical and mechanical properties of red sandstones was analyzed. Besides, the crack propagation, phase composition, and the micromorphology of red sandstone were analyzed by means of acoustic emission (AE), X-ray diffraction (XRD), and scanning electron microscope (SEM). The results show that the physical and mechanical parameters of red sandstone such as the P-wave velocity and the uniaxial compressive strength have been deteriorated in different degrees considering coupled effects of temperature and acidic etching. With the increase of the number of dry-wet cycle times, the elastic deformation section of the axial stress-strain curve of the specimen becomes shorter and the softening characteristic is gradually obvious. The evolution of AE is a good evidence for the changes of internal structure of the specimen due to the coupled effects of temperature and acidic etching. The results of the XRD and the SEM indicate that the species of minerals increase and the microstructures of the specimen were changed with the increase in the number of dry-wet cycles.
KeywordsRock mechanics Acidic etching Dry-wet cycle Acoustic emission Microstructure
This study is supported by the National Natural Science Foundation of China (Grant Nos. 51734009, 51709260, 51979272), Natural Science Foundation of Jiangsu Province, China (No. BK20180663), and the Innovation Training Program for College Students (No. 201810290039X).
- Fu Y, Liu X, Zhang Y, Hu Y, Xie Y (2009) Study on the influence of water-rock interaction to the strength of sandstone. Hydrogeol Eng Geol 6:54–58Google Scholar
- He M, Xie H, Peng S, Jiang Y (2005) Study on rock mechanics in deep mining engineering. Chin J Rock Mech Eng 24(16):2803–2813Google Scholar
- Huo R, Yang J, Yao Z, Huang P (2007) Study of physical and mechanical characteristics of sandstones subjected to hydrochloric acid attack. Rock Soil Mech 1:45–48Google Scholar
- Li G, Yu L, Jing H, Su H, Zhang T, Li M (2017) Experimental study of dynamic compressive mechanical properties of limestone after acid corrosion. Rock Soil Mech 38(11):3247–3254Google Scholar
- Liu X, Li D, Wang Z, Zhang L (2016) The effect of dry-wet cycles with acidic wetting fluid on strength deterioration of shaly sandstone. J Rock Mech Eng 35(8):1543–1554Google Scholar
- Qin H, Huang G, Wang W (2012) Experimental study of acoustic emission characteristics of coal samples with different moisture contents in process of compression deformation and failure. Chin J Rock Mech Eng 31(6):1115–1120Google Scholar
- Wang G (2003) Experiment research on the effects of temperature and visco elastoplastic analysis of Beishan granite. Xi’an University of Science and TechnologyGoogle Scholar
- Wu J, Zhao Y, Wan Z, Dong F, Feng Z, Yi L (2009) Experimental study of acoustic emission characteristics of granite thermal cracking under middle-high temperature and triaxial stress. Rock Soil Mech 30(11):3331–3336Google Scholar
- Yue H, Ma Z, Bao Y (2011) Influence of acid corrosion on contact deformation and damage of rock. J Central South Univ (Sci Technol) 5:019Google Scholar
- Zhang L (2014) Study on macro-meso damage characteristics of argillaceous sandstone under der-wet cycle in acidic condition. Chongqing University, ChongqingGoogle Scholar
- Zhao Y, Wan Z, Zhang Y, Zhang N, Feng Z, Dong F, Wu J, Qu F (2010) Experimental study of related laws of rock thermal cracking and permeability. Chin J Rock Mech Eng 29(10):1970–1976Google Scholar