A New Mode of Visible Fracture System in Coal Seams and Its Implications for Coalbed Methane Seepage

<div>Relationship between the orientation of principal stress and vertical fractures in Sihe mine: (a) maximum principal stress direction; (b) vertical fracture direction.</div>

Geofluids

fig5

Figure 5

Figure 5: A New Mode of Visible Fracture System in Coal Seams and Its Implications for Coalbed Methane Seepage 