Measurement and Analysis of Roadway Deformation and Stress under Mining-Induced Stress
Table 1
Comprehensive column diagram of the 13318 working face.
Name of rock
Thickness (m)
Lithologic description
Medium fine quartz sandstone
22.42
Grayish white; medium to fine grain structure; fracture developed; predominately siliceous cementation; high quartz content; hard; locally contained pyrite veins
Sandy mudstone
3.35
Gray; arenaceous content is higher; only appears locally; the majority is absent
Mudstone
0.55
Gray; argillaceous structure; soft; mostly absent
No. 8 coal
2.63
Black; scaly; primarily bright coal; secondarily containing dark coal and silk carbon; visible pyrite film; appears as bright briquette
Mudstone
1.44
Gray to dark gray; upper clayey; homogeneous structure; horizontal bedding; fragile
Coal line
0.34
Grayish-black; blocky; mainly dark coal; local pinching out
Sandy mudstone
2.57
Dark gray; uneven fracture; pyrite veins and a few root fossils; uniform structure, with horizontal bedding; occasionally slow-wave bedding; fragile
7–2 coal
0.92
Black; powdery; silk carbon; dark coal
Sandy mudstone
6.46
Gray to dark gray; primarily clayey upper part; lower part composed of silty sand and argillaceous material, which is composed of a thin layer, microhorizontal layer, and compact and occasionally carbonized bodies
