TITLE:
The Impact of Different Mining and Releasing Ratios on the Over-Support Pressure of Header Working Face
AUTHORS:
Huaji Zhang
KEYWORDS:
Different Extraction and Release Ratios, Overburden Support Pressure, Overburden Destabilization Mechanism
JOURNAL NAME:
World Journal of Engineering and Technology,
Vol.11 No.3,
August
7,
2023
ABSTRACT: Through
the theoretical analysis of overburden destabilization mechanism, FLAC 3D
simplified plane numerical simulation method and field measurement method, we
compared the relationship of overburden support pressure at 35 m of
workface recovery, and the peak overburden support pressure decreased from 13.85 Mpa to
11.97 Mpa
from 1:1 to 1:3. With the increase of mining ratio, the peak over-supporting
pressure decreases: with the increase of top coal recovery thickness, the peak
over-supporting pressure and the influence range will be further expanded, and
the distance between the peak over-supporting pressure and the coal wall of the
working face will be further increased and the high stress zone of the peak
area will be expanded simultaneously.