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

Figure 15

States of strata observed from boreholes at observation stations #1–3. (a) State of strata observed from borehole at observation station #1. (b) State of strata observed from borehole at observation station #2. (c) State of strata observed from borehole at observation station #3.

(a)

(b)

(c)