Behaviors and Overlying Strata Failure Law for Underground Filling of a Gently Inclined Medium-Thick Phosphate Deposit

Figure 8

(a) The subsidence change curve of the rock formation (the second-level measuring points); (b) the subsidence change curve of the rock formation (the fourth-level measuring points); (c) the subsidence change curve of the rock formation (the seventh-level measuring points); and (d) the change curve of the surface subsidence and displacement (advancement via different approaches).

(a)

(b)

(c)

(d)