Damage and Failure Evolution Mechanism for Coal Pillar Dams Affected by Water Immersion in Underground Reservoirs

Figure 4

Structure and stress environment diagrams for coal pillar dams in underground reservoirs.

(a) Dam structure of underground reservoirs in coal mines

(b) Stress environment diagram of coal pillar dams (: side abutment pressure; : overlying strata gravity; : hydrostatic pressure; : dynamic stress)