front abutment pressure

front abutment pressure

[¦frənt ə′bət·mənt ‚presh·ər]
(geophysics)
The release of energy in the superincumbent strata above the seam induced by the extraction of the seam.
References in periodicals archive ?
As the longwall face advances toward the roadway, the front abutment pressure, previously carried by a panel fender, rapidly transfers to the support system installed in the roadway and onto the outby pillar [15].
When the distance between the working face and fault decreases from 40 m to 10 m, the bearing capacity of the coal pillar decreases, and the front abutment pressure gradually decreases, and the stress transfers to the high-located strata, which have a strong bearing capacity.
Figure 6 shows that when the distance between the working face and the fault is reduced from 90 m to 30 m, the front abutment pressure peak gradually increased from 26.7 MPa to 31.1 MPa.