Fig. 8

Energy evolution curves of sandstone samples treated with different freeze–thaw cycles. A- Compaction stage; B- Elastic stage; C- Stable development stage of cracks; D- Unstable development stage of cracks; E- Post rupture stage.

Energy evolution curves of sandstone samples treated with different freeze–thaw cycles. A- Compaction stage; B- Elastic stage; C- Stable development stage of cracks; D- Unstable development stage of cracks; E- Post rupture stage.