Evolution Law of Coal Seam Abutment Pressure under the Influence of Shallow Buried Complex Strata: A Case Study

Figure 10

Vertical stress distribution of lateral coal. (a) −30 m stress distribution nephogram (note: −30 m is 30 m in front of the initial measuring point). (b) Nephogram of stress distribution at open cut. (c) 40 m stress distribution nephogram (note: 40 m is 40 m behind the initial measuring point). (d) Stress distribution nephogram of 80 m (note: 80 m is 80 m behind the initial measuring point).

(a)

(b)

(c)

(d)