engineering geology glossary

Jun 30th, 2015
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abutment: The point in a tunnel or cavern where the wall and roof (back) meet. access tunnel: Tunnel from surface to underground work site.accessory: A term applied to minerals occurring in small quantities in a rock, and whose presence or absence does not affect its mechanical properties.acid: Chemical term for an igneous rock containing more than 62%

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abutment: The point in a tunnel or cavern where the wall and roof (back) meet.access tunnel: Tunnel from surface to underground work site.accessory: A term applied to minerals occurring in small quantities in a rock, and whose presence or absence does not affect its mechanical properties.acid: Chemical term for an igneous rock containing more than 62% silica and usually less than20% dark minerals. (Contrast with intermediate and basic).actinolite Mineral: A monoclinic variety of amphibole.activity (of a soil): Ratio of plasticity index to clay fraction.adit: Tunnel (gallery) driven from a surface portal to an underground working place. Used for drainage, ventilation, transportation, or giving access to an ore body or working place.aegirine: Mineral. A variety of monoclinic pyroxene.aeolian: A term applied to deposits whose constituents have been carried by, and laid down from, the wind.agglomerate: Pyroclastic rock composed predominantly of rounded bombs of material of greater than60mm average dimension. (Contrast with pyroclastic breccia).aggregate: 1) A mixture of different materials which may be separated mechanically.2) Mineralogic material (i.e. sand gravel, crushed rock etc) which may be mixed with cement, bitumen or epoxy to form concrete or asphalt.aggregate abrasion value: A measure of the resistance of an aggregate to abrasion; the lower value, the more resistant to abrasion is the aggregate.aggregate soundness test: A chemical te

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