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A soil sample has the following size distribution; 4 to 2mm = 17%, 2 to 0.05 mm = 12%, 0.5 to 0.005 mm = 22% 0.005 to 0.002 mm = 10% <0.002 mm = 39%   what is the percent clay silt and sand? What are the modifier and textural classification?

A soil sample has the following size distribution; 4 to 2mm = 17%, 2 to 0.05 mm = 12%, 0.5 to 0.005 mm = 22% 0.005 to 0.002 mm = 10% <0.002 mm = 39%   what is the percent clay silt and sand? What are the modifier and textural classification?

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
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A soil sample has the following size distribution;

4 to 2mm = 17%,

2 to 0.05 mm = 12%,

0.5 to 0.005 mm = 22%

0.005 to 0.002 mm = 10%

<0.002 mm = 39%

 

what is the percent clay silt and sand? What are the modifier and textural classification? 

Table 1.-Guide for Determining Rock Fragment Modifier of Texture. Click here for an MS-Excel spreadsheet that calculates the texture modifiers for flat and nonflat rock fragments. Total Rock Fragments (Vol. %) 21535 2 35 < 60 ≥ 60 90 Gravel (GR), cobbles (CB), stones (ST), and boulders (BY) (Substitute channers for gravel and flagstones for cobbles, where applicable)¹ IF CB 2 1.5 ST + 2 BY IF ST 2 1.5 BY IF ST < 1.5 BY 2.90 IF GR 2 1.5 CB+2 ST +2.5BY Gravelly Very Gravelly Extremely Gravelly Cobbly Very Cobbly Extremely Cobbly Stony Very Stony Extremely Stony 1. Since total rock fragments are 28 percent, choose the first row (2 15 and < 35). 2. Under "Gravel (GR), cobbles,..., test the criterion in the left-most column. Is 15% GR 2 1.5 (10% CB) + 2 ( 3 % ST) ? Answer: NO. Bouldery Gravel Cobbles Stones Boulders Example: Determine the rock fragment modifier for a soil that contains 15 percent gravel (GR), 10 percent cobbles (CB), and 3 percent stones (ST). 3. Proceed to the next column. Is 10% CB 2 1.5 (3% ST)? Answer: YES. STOP. The modifier is Cobbly. Very Bouldery Extremely Bouldery If both flat and nonflat rock fragments are present, the quantity in each size class is summed (e.g.. gravel + channers, cobbles + flagstones). The sums are used to determine the appropriate quantity/size modifier. If the amounts of flat and nonflat rock fragments within any given size class are equal, the nonflat modifier takes precedence. For example, if there are 10 percent gravel and 10 percent channers, the modifier is gravelly. 10 100 20 30 40 SO Clay Separate, % 60 70 sandy clay XXX sandy -clay loam- sandy loam loamy. sand sandy 80 90 100 clay/ 10 clay loam loam % Sand Separate, % 30 Silt Separate, % P %0 E silty7 clay silty clay loam silt Kloam 30 D 20 70 80 silt 100
Transcribed Image Text:Table 1.-Guide for Determining Rock Fragment Modifier of Texture. Click here for an MS-Excel spreadsheet that calculates the texture modifiers for flat and nonflat rock fragments. Total Rock Fragments (Vol. %) 21535 2 35 < 60 ≥ 60 90 Gravel (GR), cobbles (CB), stones (ST), and boulders (BY) (Substitute channers for gravel and flagstones for cobbles, where applicable)¹ IF CB 2 1.5 ST + 2 BY IF ST 2 1.5 BY IF ST < 1.5 BY 2.90 IF GR 2 1.5 CB+2 ST +2.5BY Gravelly Very Gravelly Extremely Gravelly Cobbly Very Cobbly Extremely Cobbly Stony Very Stony Extremely Stony 1. Since total rock fragments are 28 percent, choose the first row (2 15 and < 35). 2. Under "Gravel (GR), cobbles,..., test the criterion in the left-most column. Is 15% GR 2 1.5 (10% CB) + 2 ( 3 % ST) ? Answer: NO. Bouldery Gravel Cobbles Stones Boulders Example: Determine the rock fragment modifier for a soil that contains 15 percent gravel (GR), 10 percent cobbles (CB), and 3 percent stones (ST). 3. Proceed to the next column. Is 10% CB 2 1.5 (3% ST)? Answer: YES. STOP. The modifier is Cobbly. Very Bouldery Extremely Bouldery If both flat and nonflat rock fragments are present, the quantity in each size class is summed (e.g.. gravel + channers, cobbles + flagstones). The sums are used to determine the appropriate quantity/size modifier. If the amounts of flat and nonflat rock fragments within any given size class are equal, the nonflat modifier takes precedence. For example, if there are 10 percent gravel and 10 percent channers, the modifier is gravelly. 10 100 20 30 40 SO Clay Separate, % 60 70 sandy clay XXX sandy -clay loam- sandy loam loamy. sand sandy 80 90 100 clay/ 10 clay loam loam % Sand Separate, % 30 Silt Separate, % P %0 E silty7 clay silty clay loam silt Kloam 30 D 20 70 80 silt 100
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