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

Figure 7

Stress evolution contrast analysis diagram of different measuring points. (a) Stress evolution curves of measuring points 2-1 and 5-2. (b) Stress evolution curve of measuring points 2-2 and 6-1. (c) Stress evolution curve of measuring point 1-2 and 5-1. (d) Stress evolution curve of measuring points 3-1 and 7-2.

(a)

(b)

(c)

(d)