Mechanical Properties of Sandstone Roof and Surrounding-Rock Control of Mining Roadways Subject to Reservoir Water Disturbance

Figure 6

Sketch maps of specimen-fracture characteristics. (a) Pore pressure 0. (b) Pore pressure 0.1 MPa. (c) Pore pressure 0.2 MPa. (d) Pore pressure 0.4 MPa. (e) Pore pressure 0.6 MPa.

(a)

(b)

(c)

(d)

(e)