Structural Mechanical Characteristics and Instability Law of Roof Key Block Breaking in Gob-Side Roadway

Figure 7

Cloud chart of surrounding rock displacement evolution after excavation of three roadway models. (a) Roadway ① (unit: m). (b) Roadway ② (unit: m). (c) Roadway ③ (unit: m).

(a)

(b)

(c)