Coarse-grained soils

The order Aridisol is, as its name suggests, typical of arid climate conditions and found in the southwest deserts. The Aridisol for this project is of the Sagehill series and was collected from Gilliam County, Oregon. The soil is an alkaline coarse-grained soil with free CaC03. It has low infiltration rates and capacities. 

Is applicable to both fine- and coarse-grained soils is readily modeled and designed for field applications. 

Rubber-tired rollers Coarse-grained soils with Road and airfield subgrade Coarse uniform cohesionless... 

Static Fine-grained soils with more Dams, embankments. Clean coarse-grained soils. 

Vibrating plate (light) Coarse-grained soils, 4 to 8% fines Small patches Cohesive soils... 

Pervious coarse-grained soil— Zone 1 of Figure 5 200-250 33-41... 

Measure the mass (or weight) of solids per unit volume of soil. Often used as a quality control for compaction of fill Indicate the degree of compaction that can be achieved at different moisture contents with different compactive efforts Density index indicates the stiffness and peak strength of coarse grained soils. A number of different methods are available, so the method used should be clearly stated... 

D = DEPTH OF FOOTING BELOW GROUND SURFACE Es = MODULUS OF ELASTICITY OF SOIL Cs = SHAPE COEFFICIENT OF LOADED AREA FOR COARSE GRAINED SOILS AND VERY SOFT TO MEDIUM STIFF FINE GRAINED SOILS, Es IS ASSUMED TO INCREASE LINEARLY WITH DEPTH (Es=fz)... 

NOTES 1. NONPLASTIC SILT IS ANALYZED AS COARSE GRAINED SOIL WITH MODULUS OF ELASTICITY INCREASING LINEARLYWITH DEPTH. 

VALUES OF Kvi SHOWN FOR COARSE GRAINED SOILS APPLY TO DRY OR MOIST MATERIAL WITH THE GROUND WATER LEVEL AT A DEPTH OF AT LEAST 1.5B BELOW BASE OF FOOTING. 

Where immediate settlements dominate, compute values by the procedure of Figure 4.13 for coarse grained soils and Figure 4.14 for stiff or hard, fine grained soils. 

Coarse-grained Soil y / Fine-grained soil... 

Determine percentages of gravel and sand from grain-size curve. Depending on fines (fraction smaller than No. 200 sieve size) coarse-grained soils are classified as follows ... 

Quaternary alluvium that composed of fine grained materials and coarse grained soils... 

Granular soil means gravel, sand, or silt (coarse grained soil) with little or no clay content. Granular soil has no cohesive strength. Some moist granular soils exhibit apparent cohesion. Granular soil cannot be molded when moist and crumbles easily when dry. 

Immediate Settlement by Elastic Analysis Methods Settlement in Coarse-Grained Soil Settlement in Fine-Grained Soils Tolerable Settlement... 

For free draining coarse-grained soils and long-term or drained bearing capacity in saturated fine-grained soils (i.e., when c = 0.0),... 

Well graded mixture of fine and coarse-grained soil Very compact 8-12 10... 

For the normally expected rate of most static loadings, in situ deposits of coarse-grained soils, namely, sand, gravel, and so on, with little or no fine content, in particular clay fraction, can be considered as free draining soils when subjected to additional stresses due to static loading. Most, if not all, of the footing settlement in this type of soil can be expected to occur immediately after the load application. Thus, for all practical purposes, the total footing settlement in this type of soil may be taken as equal to the immediate or elastic settlement evaluated based on Equation 8.36. 

Elastic settlement occurs almost instantaneously compared to the rate of application of static service loads—both permanent and live. Thus, similar to footings in coarse-grained soils, both permanent and live service loads need to be included in estimating the immediate settlement of footing in fine-grained soils. 

The use of nonwoven geotextile for filtration or drainage purposes instead of coarse-grained soils is very attractive in applications such as paved and unpaved... 

Coarse-grained soils with fines CM, GC, SM. SC contains >12% fines 100 400 1000 2(XK)... 

Coarse-grained soils with little or no fines GW, SW, GP, SP contains <12% fines (or any borderline soil beginning with GM-GC or GC-SC) 200 1000 2000 3000... 

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