Coal and Gas Comining in the High-Gas Detong Mine, China: Analytical and Numerical Parameter Optimization of Gas Extraction Boreholes

Figure 4

Vertical stress distribution at various horizontal distances from the floor: (a) 0 m; (b) 10 m; (c) 30 m; (d) 45 m; (e) 60 m; (f) 75 m.

(a)

(b)

(c)

(d)

(e)

(f)