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

Figure 9

(a) The stress distribution diagram of the fourth-level mining approach; (b) the stress distribution diagram of the eighth-level mining approach; (c) the stress distribution diagram of the twelfth-level mining approach; (d) the stress distribution diagram of the fourth-level recovery route; (e) the stress distribution diagram of the eighth-level recovery route; and (f) the stress distribution diagram of the twelfth-level recovery route.

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