Experimental investigation on tensile strength and its loading rate effect of sandstone after high temperature treatment |
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| Authors: | Haijian Su Hongwen Jing Mingrui Du Chen Wang |
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| Institution: | 1.State Key Laboratory for Geomechanics & Deep Underground Engineering,China University of Mining & Technology,Xuzhou,China;2.School of Mechanics and Civil Engineering,China University of Mining & Technology-Beijing,Beijing,China |
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| Abstract: | High temperature damage of rock is a critical problem that must be well known for underground coal gasification, underground storage of nuclear waste, repairment of underground buildings after fire disaster. In order to study the influences of loading rate and high temperature on the tensile strength of sandstone, Brazilian splitting tests were conducted on sandstone disk samples treated with five different temperature levels between 25 and 800 °C at six different loading rates between 0.01 and 10 mm/min. Test results showed that tensile strength of disk samples increases gradually and reaches to the maximum at the temperature level of 400 °C, then drop sharply. The tensile strength of sandstone samples is characterized by obvious rate effect and it increases continuously with the increase of loading rate, meeting a Logarithmic Function. The lower limit tensile strength of sandstone ignoring the influence of rate effect was calculated, and it is helpful for providing some basis for the design of rock engineering. |
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