WANG Z Z, QIN B D, GUO J Q,et al.Influence of high temperature treatment on mechanical properties and energy evolution mechanism of sandstone[J].Journal of Henan Polytechnic University(Natural Science) ,2022,41(6):181-187.

doi:10.16186/j.cnki.1673-9787.2020110090

Received:2020/11/28

Revised:2021/03/31

Published:2022/11/25

Influence of high temperature treatment on mechanical properties and energy evolution mechanism of sandstone

WANG Zhenzhen1, QIN Bendong1, GUO Jiaqi1, JIN Guoming2

1.School of Civil Engineering，Henan Polytechnic University，Jiaozuo  454000，Henan，China；2.Second Highway Engineering Co.，Ltd. Fourth Highway Engineering Co.，Ltd.，China Communications Construction Co.，Ltd.，Luoyang  471023，Henan，China

Abstract:In order to study the influence of high temperatures treatment on mechanical properties and energy evolution mechanism of coal measures，the self-developed heating system and RMT-150B mechanical testing system were used to conduct heating and uniaxial compression tests on coalmeasures sandstone.The regularities on the strength and deformation characteristic with temperature varying were discussed.The experimental results showed that the uniaxial compression stress-strain curve of sandstone showed the same trend with the increase of temperature and the sample changed from brittleness to plasticity with temperature rising.The peak strength and elastic modulus of sandstone decreased with the increase of temperature，while the peak strain increased obviously with the increase of temperature.The total strain energy and elastic energy of sandstone were positively correlated with temperature，while the dissipated energy was negatively correlated with temperature.Temperature had a significant influence on the failure mode of sandstone，the failure pattern of sandstone developed from single-slope shear failure to multi-shear failure as temperature rising.

Key words:coal measures sandstone;high temperature treatment;uniaxial compressive;mechanical property;energy evolution mechanism;failure mode

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