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Vertical Subgrade Modulus

This document provides typical vertical subgrade modulus values (Kv) in kips/ft3 for different soil and bedrock materials based on their Unified Soil Classification System (USCS) designation and consistency. Kv values range from 25 kips/ft3 for soft silt to 400 kips/ft3 for very dense hard rock. Denser and stiffer materials have higher Kv values.

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Lance Alexander Weideman
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261 views1 page

Vertical Subgrade Modulus

This document provides typical vertical subgrade modulus values (Kv) in kips/ft3 for different soil and bedrock materials based on their Unified Soil Classification System (USCS) designation and consistency. Kv values range from 25 kips/ft3 for soft silt to 400 kips/ft3 for very dense hard rock. Denser and stiffer materials have higher Kv values.

Uploaded by

Lance Alexander Weideman
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Vertical Subgrade Modulus Values

MATERIAL TYPE

USCS

CONSISTENCY

GRANULAR SOILS

GW,GP,GC

LOOSE

50

COHESIVE SOILS

GW,GP,GC
GW,GP,GC
SW
SW
SW
SP
SP
SP
SC
SC
SC
SM
SM
SM
ML

MEDIUM DENSE
DENSE
LOOSE
MEDIUM DENSE
DENSE
LOOSE
MEDIUM DENSE
DENSE
LOOSE
MEDIUM DENSE
DENSE
LOOSE
MEDIUM DENSE
DENSE
SOFT

170
270
90
200
300
50
130
200
75
190
280
70
180
270
25

ML
ML
ML
CL
CL
CL
CL
CH
CH
CH
CH
MH
MH
MH
MH

FIRM
STIFF
VERY STIFF
SOFT
FIRM
STIFF
VERY STIFF
SOFT
FIRM
STIFF
VERY STIFF
SOFT
FIRM
STIFF
VERY STIFF

50
75
105
35
60
90
130
40
80
115
170
35
60
95
120

BEDROCK 1
BEDROCK 2
BEDROCK 3
BEDROCK 4
BEDROCK 5

DENSE
DENSE
DENSE
DENSE
DENSE

200
240
300
400
270

BEDROCK
SANDSTONE
SILTSTONE
SOFT ROCK
HARD ROCK
LIMESTONE

Kv, Modulus of
Vertical Subgrade
Reaction,
kips/ft^3

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