Study on Temporal and Spatial Characteristics of Overlying Strata in the Deep Coal Mining Process

Figure 13

Failure units number of coal and rock mass in the mining process of the working face. (a) Shear_now; (b) tension_now; (c) shear_past; (d) tension_past; (e) total number of failure units.

(a)

(b)

(c)

(d)

(e)