asbogstudy13

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Author:
Geo83
ID:
98210
Filename:
asbogstudy13
Updated:
2011-08-24 09:50:37
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ASBOG Study Guide Chapter Thirteen
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Engineered Structures
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  1. Abutment
    A structure that supports the end of a dam
  2. Berm
    A relatively narrow, horizontal bench built along an embankment
  3. Crown
    The roof of a mine
  4. Cutoff
    An impermeable structure placed beneath the base of a dam to prevent or reduce seepage loss. The structure may be made of concrete, compacted clay or grout
  5. Dam Crest
    The flat top of dam
  6. Flowing Ground
    Soil that flows into a tunnel from the floor, roof, or walls of a tunnel driven by water seepage. The flow typically consists of cohesionless soil below the water table
  7. Freeboard
    Vertical distance between the dam crest and the water surface of the reservoir
  8. Grout
    A cement slurry of high water content used to seal fissures
  9. Grout Curtain
    A grout barrier used in the vicinity of tunnels or dams where cracks of joints in the rocks are filled with a liquid cement that is pumped or poured into spaces to seal them
  10. Gunite
    A misture of Portland cement, sand, and water applied by pneumatic pressure through a special hose onto maine timbers, tunnel supports and roadways to seal and fireproof them
  11. Invert
    The floor or bottom of a closed conduit, such as a tunnel, aqueduct, or drain
  12. Lagging
    Boards which are joined, side-by-side, lining an excavation
  13. Phreatic Line
    Seepage line. The uppermost level at which flowing water emerges along a seepage face.
  14. Piping
    Erosion by percolating water or seepage in a layer of subsoil resulting in caving and the formation of tunnels or pipes through which the soluble or granular material is removed
  15. Pressure-Relief Well
    Wells drilled at the toe of the dam to reduce the uplift pressure and prevent piping
  16. Random Zones
    Areas within the dam where excavation materails are placed. A random zone is placed where permeability and shear strength are not critical and where weight is important
  17. Raveling Ground
    Rock or soil that drops out of the roof or walls of a tunnel over time
  18. Riprap
    A loose assemblage of broken rocks used fro foundations or slope protection
  19. RQD
    Rock Quality Designation. A measure of the intactness of rock core, relating the percentage of intact core to the total core run.
  20. Running Ground
    Soil that runs into the tunnel after removal of roof and wall supports; typically dry cohesionless sand
  21. Shotcrete
    Gunite that commonly includes coarse aggregate up to about 1 inch (2cm)
  22. Slaking
    Disintegration of rock or soil when submerged in water. Outcrops of sound rock when subjected to a shrink swell cycle crumble into flakes or particles
  23. Spillway
    A channel for reservoir overflow
  24. Squeezing Ground
    Soil or rock that creeps into a tunnel and maintains a constant volume
  25. Swelling Ground
    Rock or soil that increases in volume when excavated. Volume increase is usually caused by the presense of clay minerals with a high swelling capacity.

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