Study on Sound Propagation Performance of Mechanized Coal Gangue-Fine Sand Filling Body

Figure 5

Relationship between strength and wave velocity: (a) test sample 1, (b) test sample 2, (c) test sample 3, (d) test sample 4, (e) test sample 5, (f) test sample 6, (g) test sample 7, (h) test sample 8, and (i) test sample 9.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

(i)