GUO J P, YANG Y G, ZHANG W,et al.Experimental study on dynamic damage and failure characteristics of blue sandstone after high temperature[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(2):160-165.

doi:10.16186/j.cnki.1673-9787.2021010118

Received:2021/01/25

Revised:2021/03/08

Published:2023/03/25

Experimental study on dynamic damage and failure characteristics of blue sandstone after high temperature

GUO Jinping1, YANG Yanguang1, ZHANG Wen1, LI Yachao2

1.School of Resource Engineering，Xi’an University of Architecture and Technology，Xi’an  710055，Shaanxi，China；2.School of Civil Engineering，Henan Polytechnic University，Jiaozuo  454000，Henan，China

Abstract:In order to study the dynamic damage and damage characteristics of blue sandstone after high temperature，the specimens of blue sandstone after 25 ℃ （room temperature）and high temperature of 200 ℃，400 ℃，600 ℃，800 ℃ and 1 000 ℃ were prepared.The split Hopkinson pressure bar （SHPB） test system was used to carry out impact test of blue sandstone specimens under different impact pressure conditions.The stress-strain curves were gotten under different temperatures，and the relationship between the peak strength and average modulus of blue sandstone specimens and the impact pressure was analyzed.The damage degree change laws with the impact pressure and heating temperature were studied.In addition，the scanning electron microscope（SEM） was used to test the fracture of the damaged specimens，and the change causes of dynamic damage and failure characteristics of green sandstone after high temperature were explained from the microscopic point of view.The test results showed that the peak strength and average modulus of green sandstone specimens after high temperature decreased with the increase of temperature，the decreasing rate was slower below 600 ℃ and faster above 600 ℃，that was，600 ℃ was the inflection point of mechanical strength of green sandstone specimens. With the increase of heating temperature， the internal micro-cracks of the blue sandstone continued to expand and penetrate，and the degree of fragmentation under the impact became more serious，which eventually led to the continuous degradation of its macroscopic dynamic mechanical properties.

Key words:high temperature;SHPB test equipment;sandstone dynamic property;SEM;damage characteristic

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