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a. The pressure to which a rock formation is subjected by the weight of
the superimposed rock and rock material or by diastrophic forces created
by movements in the rocks forming the Earth's crust. Such pressures may be
great enough to cause rocks having a low compressional strength to deform
and be squeezed into and close a borehole or other underground opening not
adequately strengthened by an artificial support, such as casing or
timber. Also called rock pressure. CF: bottom-hole pressure Long
b. The weight of a machine divided by the area in square inches of the
ground directly supporting it. Nichols, 1
Source:
Dictionary of Mining, Mineral, and Related Terms
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