Research Article
Study on Fracture and Stress Evolution Characteristics of Ultra-Thick Hard Sandstone Roof in the Fully Mechanized Mining Face with Large Mining Height: A Case Study of Xiaojihan Coal Mine in Western China
Figure 10
Rock movement characteristics during excavation of working face: (a) the sinking curve of immediate roof; (b) the sinking curve of main roof.
(a) |
(b) |