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Definition
| Any uncemented or weakly cemented accumulation of mineral particles by weathering of rocks |
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Term
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Definition
1. Erosive action of water, ice, and wind
2. Chemical reactions
3. Loosening by plant root growth
4. Thermal expansion and contration
5. Land slides
6. Abrasion from the downhill movement of nearby rock and soil. |
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Term
| 4 basic USCS categories of soil |
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Definition
1. Coarse grained (gravel, sand)
2. Fine grained (silt, clay) |
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Term
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Definition
| The grain size that corresponds to 10% of the sample passing by weight. |
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Term
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Definition
Good representation of particle size over a wide range.
Gradation curve is smooth.
Generally concave upward. |
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Term
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Definition
Excess or deficiency of certain sizes.
Most of the particles about the same size.
Gap-graded or skip-graded---The proportion of grain sizes at a certain range (e.g. 0.5~0.1 mm) is relatively low. |
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Term
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Definition
| relative denseness or looseness of a coarse-grained soil. |
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Term
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Definition
solid
semi solid
plastic
liquid |
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Term
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Definition
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Definition
| semi solid to plastic state - at which soil crumbles |
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Definition
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Definition
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Definition
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Definition
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Definition
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Term
| Thickness of lift (layer or soil to be compacted) |
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Definition
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Term
| compaction is a function of 4 variables |
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Definition
water content
initial dry unit weight
soil type
compaction effort |
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Term
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Definition
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Term
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Definition
quartz - silicon dioxide
feldspar - crystalline |
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Term
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Definition
kaolinite
montmorillonite - sandwhich
illite - K - stronger than mont, weaker than kao |
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Term
| factors that affect soil structure |
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Definition
| The shape, size, and mineralogical composition of soil particles, the nature and composition of soil water. |
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Term
| structures in clayey soils |
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Definition
dispersed - face to face
flocculated - edge to edge or edge to face |
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Term
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Definition
| encompass sands and/or gravels, and the large quantities of groundwater that is transmitted through. |
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Definition
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Definition
| water at top of aquifers under pressure |
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Definition
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Definition
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Definition
| the change in total head per unit length in the direction of flow. |
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Term
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Definition
depends primarily on the average size of pores
varies with temp |
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