Analysis of Factors Influencing Stability of Overlying Soil Layer on Thin Bedrock Based on Crack Development-Closure Test

Figure 4

Failure process of the overlying soil layers of thin bedrock: (a) natural state; (b) coal seam mining out ⟹ thin bedrock collapses or fractures ⟹ supporting space decreases and soil layer subside; (c) overlying soil layers recompact on the collapsed thin bedrock.

(a)

(b)

(c)