Study on the Interaction between Low-Viscosity High-Permeability Pregrouting Sealing Material and Coal and Its Application

Figure 1

Stress distribution diagram of elastic-plastic zones of a borehole. R₀ is the radius of the borehole, R_s is the radius of the plastic softening zone, and R_h is the radius of the plastic hardening zone; 1 is the plastic softening zone, 2 is the plastic hardening zone, and 3 is the elastic zone.