COMMONWEALTH OF PENNSYLVANIA DEPARTMENT OF TRANSPORTATION
[Pages:3]UNIFIED SOIL CLASSIFICATION SYSTEM
(A)
PRIMARY DIVISIONS
FOR FIELD & LABORATORY IDENTIFICATION
COARSE-GRAINED SOILSMORE THAN 50% OF THE MATERIAL IS LARGER THAN 0.075 mm (NO.200) SIEVE SIZE
GRAVELS: 50% OR MORE OF COARSE FRACTION IS LARGER THAN 4.75 mm (NO.4) SIEVE SIZE
SANDS: 50% OR MORE OF COARSE FRACTION IS SMALLER THAN 4.75 mm (NO.4) SIEVE SIZE
CLEAN GRAVELS
(C)
LESS THAN 5% FINES
GRAVELS WITH FINES
(C)
MORE THAN 12% FINES
CLEAN SANDS
(D)
LESS THAN 5% FINES
SANDS WITH FINES
(D)
MORE THAN 12% FINES
FINE-GRAINED SOILS50% OR MORE OF THE MATERIAL IS SMALLER THAN 0.075 mm (NO.200) SIEVE SIZE
SILTS & CLAYS: LIQUID LIMIT 50
SILTS & CLAYS: LIQUID LIMIT 50
INORGANIC ORGANIC INORGANIC
ORGANIC
LABORATORY CLASSIFICATION CRITERIA Cu>4 AND l220 (32,000)
HIGH (HARD)
(H)
HAND HELD SPECIMEN BREAKS WITH HAMMER END OF PICK UNDER MORE THAN ONE BLOW. LEAVES A FAINT GROOVE WHEN SCRATCHED WITH KNIFE.
55-220 (8,000-32,000)
MEDIUM (M)
LOW (SOFT) (L)
CAN JUST BE SCRAPED OR PEELED WITH KNIFE. (COMPARABLE TO CONCRETE)
EASILY SCRATCHED WITH KNIFE. LEAVES A DEEP GROOVE WITH BROKEN EDGE.
14-55 (2000-8000)
3-14 (500-2000)
VERY LOW (VERY SOFT)
(VL)
CAN BE SCRATCHED WITH FINGERNAIL.
1-3 (125-500)
REFERENCES: FHWA SOILS AND FOUNDATION WORKSHOP MANUAL, 1993.
WEATHERING CLASSIFICATION
GRADE FRESH
SYMBOL
DIAGNOSTIC FEATURES
F
NO VISIBLE SIGN OF DECOMPOSTION OR
DISCOLORATION. RINGS UNDER HAMMER IMPACT.
SLIGHTLY WEATHERED
WS
SLIGHT DISCOLORATION INWARDS FROM OPEN FRACTURES, OTHERWISE SIMILAR TO F.
MODERATELY WEATHERED
WM
DISCOLORATION THROUGHOUT. WEAKER MINERALS SUCH AS FELDSPAR DECOMPOSED. STRENGTH SOMEWHAT LESS THAN FRESH ROCK BUT CORES CANNOT BE BROKEN BY HAND OR SCRAPED BY KNIFE. TEXTURE PRESERVED.
HIGHLY WEATHERED
WH
COMPLETELY WEATHERED
WC
MOST MINERALS SOMEWHAT DECOMPOSED. SPECIMENS CAN BE BROKEN BY HAND WITH EFFORT OR SHAVED WITH KNIFE. CORE STONES PRESENT IN ROCK MASS. TEXTURE BECOMING INDISTINCT BUT FABRIC PRESERVED.
MINERALS DECOMPOSED TO SOIL BUT FABRIC AND STRUCTURE PRESERVED (SAPROLITE). SPECIMENS EASILY CRUMBLED OR PENETRATED.
RESIDUAL SOIL
RS
ADVANCED STATE OF DECOMPOSITION RESULTING IN PLASTIC SOILS. ROCK FABRIC AND STRUCTURE COMPLETELY DESTROYED. LARGE VOLUME CHANGE.
REFERENCE: SOIL MECHANICS, NAVFAC DM-7.01, SEPT. 1986
DISCONTINUITY SPACING
* DETAILED DESCRIPTION
DESCRIPTION FOR STRUCTURAL FEATURES: BEDDING, FOLIATION, OR FLOW BANDING
SPACING
DESCRIPTION FOR JOINTS, FAULTS OR OTHER FRACTURES
VERY THICKLY (BEDDED, FOLIATED, OR BANDED)
>1800 (> 6')
VERY WIDELY (FRACTURED OR JOINTED )
THICKLY MEDIUM
600-1800 (2'-6')
200-600 (8"-24")
WIDELY MEDIUM
THINLY
VERY THINLY INTENSELY (LAMINATED, FOLIATED, OR CLEAVED)
VERY INTENSELY
60-200 (2"-8")
20-60 ("-2")
6-20 ("-")
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