Study on the Evolution Law of Fracture Field in Full-Mechanized Caving Mining of Double System and Extrathick Coal Seam

<div>Movement and fracture evolution of overburden along with the panel: (a) the excavation of 120 m; (b) the excavation of 160 m.</div>

Advances in Civil Engineering

Figure 5: Study on the Evolution Law of Fracture Field in Full-Mechanized Caving Mining of Double System and Extrathick Coal Seam 