Mechanism of Loading Fracture of Coal Mass and Formation of Oil and Gas Disaster Channel in Coal and Oil Resources Costorage Area
Table 1
CT slice processing and fracture characteristics analysis of coal samples.
Samples
Picture type
2 cm
4 cm
6 cm
8 cm
10 cm
Fracture characteristics
C1
CT section
The fracture types are complex, the main fractures are developed, and the microfractures are many, especially the two main fractures longitudinally distributed in the middle. These major fractures are approximately 60 mm long and greater than 60 mm in depth, and the opening is 2 mm.
Binary graph
C2
CT section
Microfractures are developed, and the number of fractures gradually decreases from the edge to the middle. An obvious intersection can be observed between the vertical (strip in binary image) and the fractures mainly in the direction of parallel slices (schistose in binary image).
Binary graph
C3
CT section
The coal mass is relatively complete, and microfractures are sporadically distributed. Occasionally, cracks with long trace length appear, but the depth is small.
