Influence of Upper Seam Extraction on Abutment Pressure Distribution during Lower Seam Extraction in Deep Mining

Figure 6

Mining-induced stress distribution. (a) Vertical stress distribution of the lower seam after the extraction of the upper seam. (b) Vertical stress distribution when the length of the panel was 200 m. (c) Variation of peak stress concentration factors of the advanced abutment pressure in lower seam.

(a)

(b)

(c)