See:geohydrology
a. See:water table
b. The elevation of the water table at a particular place or in a
particular area, as represented by the level of water in wells or other
natural or artificial openings or depressions communicating with the zone
of saturation. Syn:ground-water table
The process of lowering the water table so that an excavation can be
carried out in the dry. This is done by means of well points.
Hammond
An area or region in which geology and climate combine to produce
ground-water conditions consistent enough to permit useful
generalizations. AGI
See:water table
See:water table; ground-water level.
The water seeping into shallow workings or shafts may be traced to the
surface source by means of tracer dyes or salts. These substances,
however, may be leached out of the water by the soil or strata. Some
radioactive isotopes are better tracers because of the high sensitivity
with which they can be detected. Tritium, an isotope of hydrogen, is
unique because it can be used to label the actual water molecule to be
traced and is not chemically removed by the strata. Nelson
Vibrations of soil or rock. See also:ground roll
A bare or insulated cable used to connect the metal frame of a piece of
equipment to the mine track or other effective grounding medium.
MSHA, 1
a. The lithostratigraphic unit next in rank above formation, consisting
partly or entirely of named formations. A group name combines a geographic
name with the term "group," and no lithic designation is included; e.g.,
San Rafael Group. AGI
b. A stratigraphic sequence that will probably be divided in whole or in
part into formations in the future. See also:analytic group
AGI
c. A general term for an assemblage or consecutive sequence of related
layers of rock, such as of igneous rocks or of sedimentary beds.
AGI
d. A more or less informally recognized succession of strata too thick or
inclusive to be considered a formation. AGI
e. A number of shots sufficiently close together to be treated in common
in respect to preparation for firing. BS, 12
a. A main haulageway drive built in the solid rock underlying the group of
seams that it has to serve, or in the floor of a thick deposit. It is
preferable to construct the main haulageway as a subdeposit drive, because
drives in the deposit suffer from pressure as soon as mining has
progressed a certain distance. Stoces
b. Syn:subdeposit level
a. A pumpable slurry of neat cement or a mixture of neat cement and fine
sand, commonly forced into boreholes or crevices in a rock to prevent
ground water from seeping or flowing into an excavation, to seal crevices
in a dam foundation, or to consolidate and cement together rock fragments
in a brecciated or fragmented formation. Also called cement grout.
Long
b. A cementitious component of high water-cement ratio, permitting it to
be poured or injected into spaces within masonry walls. It consists of
portland cement, lime, and aggregate, and is often formed by adding water
to mortar. ACSG, 2
c. The act or process of injecting a grout into a rock formation through a
borehole or crevice. Long
d. Applied to waste material of all sizes obtained in quarrying stone.
Fay
e. A coarse kind of plaster or cement usually studded with small stones
after application, sometimes used for coating walls of a building.
Webster 3rd
Core obtained by drilling into and through formations into which grout has
been injected and allowed to set. Long
An area into which grout has been injected to form a barrier around an
excavation or under a dam through which ground water cannot seep or flow.
Long
a. In the stonework industry, a laborer who maintains the floors,
equipment, machinery, and yard in a clean and unobstructed condition,
using shovels, brooms, buckets, and wheelbarrows to collect and remove
stone scraps, dirt, and debris to dump for disposal or to remove steel
shot from under gangsaws and store it in suitable containers to be washed
and reused. Also called mucker. DOT
b. See:box loader
A borehole drilled for the express purpose of using it as a means by which
grout may be injected into the rock surrounding the borehole.
CF:consolidation hole
The injection of grout into fissured, jointed, or permeable rocks in order
to reduce their permeability or increase their strength. AGI
An act or process of forcing grout into crevices in rock formations,
usually through a borehole, by pressure pumps. Long
A machine that mixes the dry ingredients for a grout with water and
injects it, under pressure, into a grout hole. CF:grout machine
Long
An orthorhombic mineral, MnO(OH) ; trimorphous with manganite and
feitknechtite; in brilliant submetallic to adamantine wedge-shaped
crystals in the banded iron formations of the Cuyuna Range, MN.
A mechanism by which grout may be pressure-injected into a grout hole.
CF:grout injector