: If this is a digital file you downloaded, a .rar is a compressed archive.
: Reports indicate the roadway has been excavated for approximately 700 meters . Structural Performance : 21201.rar
The file (or RAR 21201 ) primarily refers to a specific underground coal mine roadway discussed in geotechnical and engineering studies regarding deep mining stability. : If this is a digital file you downloaded, a
: The coal pillar side often shows vertical outward collapse, indicating high lateral pressure. Alternative Contexts : The coal pillar side often shows vertical
: The layers are generally described as complete with no major separation cracks inside or outside the anchorage zones.
: While the RAR format itself is secure, the contents can be malicious. It is recommended to use antivirus software like Avast to scan archives before extraction.
: Significant deformation was noted, with floor heave typically appearing 2 days after excavation , reaching amounts of 300–400 mm .