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

Figure 12

Nephogram of pore-water pressure and pore-pressure survey-line data. (a) 0.1 MPa water pressure. (b) 0.4 MPa water pressure. (c) 0.6 MPa water pressure. (d) 1 MPa water pressure.

(a)

(b)

(c)

(d)