Fig 1.
(a) Sandstone sample before high temperature heating, (b) Box type resistance furnace, (c) High temperature heating scheme [26], (d) Sandstone samples after heat treatment.
Fig 2.
Schematic diagram of experimental equipment.
Fig 3.
Characteristic stress calculation curve of sandstone under temperature.
Table 1.
Relevant parameters of sandstone samples after heating.
Fig 4.
Characteristic stress threshold ratio curves after different temperature effects.
Fig 5.
Show sandstone samples heated at different temperatures.
(a) Stress-strain, (b) Mechanical parameters.
Fig 6.
Continued.
Table 2.
Evolution of microcracks in sandstone samples at different stress stages under high temperature.
Fig 7.
Changes of RA-AF during uniaxial compression of sandstone under different temperatures.
Fig 8.
SEM images [26] and DIC main strain field nephogram of sandstone samples after heating at different temperatures.
Fig 9.
Schematic diagram of acoustic emission signal reception of shear microcracks [34].