Surface Subsidence Control Mechanism and Effect Evaluation of Gangue-Backfilling Mining: A Case Study in China

Figure 4

Mixture’s stress-strain relationship with different ratios: (a) sponge and foam 1 : 3; (b) sponge and foam 1 : 2; (c) sponge and foam 1 : 1.

(a)

(b)

(c)