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

Table 3

Strength characteristic values of unloading seepage.

Test number	Water pressure (MPa)	(MPa)	(MPa)
S-2	0.1	21.80	22.70
S-3	0.2	21.34	22.61
S-4	0.4	19.97	21.88
S-5	0.6	19.34	21.16