- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
- Company Profile:
The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
A soft, waxy stone--such as pinite, pyrophyllite, or steatite--of a gray, green, yellow, or brown shade; used by the Chinese to simulate jade for carving small images, miniature pagodas, and similar objects.
Industry:Mining
A soil and rock failure criterion, which accounts for the general effect of all three principle stresses by using the invariant of the stress tensor. Use is limited to numerical formulations, such as finite element analysis.
Industry:Mining
A soil deposit that has been subjected to an effective pressure greater than the present overburden pressure.
Industry:Mining
A soil in which clay is the basic constituent. The clay contributes to strength by cohesion, but detracts from stability by volume change and by plastic flow under load.
Industry:Mining
A soil in which gravel and sand predominate. Coarse-grained soils are those least affected by moisture-content changes as most surface rain, etc., becomes gravitational water.
Industry:Mining
A soil occurring most commonly under arid conditions, but may also be found in semiarid and subhumid regions. Usually found in depressions where it has originated by evaporation under shallow ground-water conditions. Characterized by sodium carbonate as the predominant salt and a dark-colored B horizon, which is strongly alkaline in reaction.
Industry:Mining
A soil penetration test in which a steel cone of standard shape and size is pushed into the soil and the force required to advance the cone at a predetermined, usually slow and constant rate, or for a specified distance, or in some designs the penetration resulting from various loads, is recorded.
Industry:Mining
A soil permeability test in which the borehole is filled up with water and the rate at which the water falls is observed.
Industry:Mining
A soil permeability test in which the level of water in a borehole is reduced and then the rate at which the water recovers is observed.
Industry:Mining
