2020-05-13_PERMIT FILE - M2020022

• Permit No: M2020022
• IBM Index Class Name: PERMIT FILE
• Doc Date: 5/13/2020
• Doc Name: Adequacy Review Response
• From: Environment, Inc.
• To: DRMS
• Email Name: DC1
• Media Type: D
• Archive: No

2.6
Excerpt from Rock Slopes: Design, Excavation and Stabilization,
Publication No. FHWA-TS-89-045,
TABLE 1 - TYPICAL SOIL AND ROCK PROPERTIES
Description Unit weight Friction Cohes ion
(Saturated/dry) angle
'jpe Material Zb/ft3 kN/m3 degrees -cb/ft2 kPa
Loose sand. uniform grain size 118/90 19/14 28-34"
Dense sand, uniform grain site 130/109 21/17 32-40"
0 [oionssee sand, mixed grain size 124/99 20/16 34-40*D sand, mixed grain size 135/116 21/18 38-46*
A N
Gravel, uniform grain size 140/130 22/20 34-37*
v Sand and gravel , mixed grain size 120/110 19/17 48-45"
u
o Basalt 140/110 22/17 40-50*
r Chalk 80/62 13/10 30-40"
s.
Granite 125/110 20/17 45-50"
Limestone 120/100 19/16 35-40*
Sandstone 110/80 17/13 35-45*
y
S Shale 125/100 20/16 30-35"
Soft bentonite 80/30 13/6 7-13 200-400 10-20
Very soft organic clay 90/40 14/6 12-16 200-600 10-30
Soft, slightly organic clay 100/60 16/10 22-27 400-1000 20-50
a. Soft glacial clay 110/76 17/12 27-32 600-1500 30-70
Stiff glacial clay 130/105 20/17 30-32 1500-3000 70-150
Glacial till, mixed grain size 145/130 23/20 32-35 3000-5000 150-25C
N Hard igneous rocks - 1604to 190 25 to 30 35-45 720000- 35000-
c granite, basalt, porphyry 1150000 55000
0
Metamorphic rocks 160 to 180 25 to 28 30-40 400000- 20000-
quartrite, gneiss. slate 800000 40000
o Hard sedimentary rocks - 200000- 10000-
150 to 180 23 to 28 35-45 600000 30000
limestone, dolomite, sandstone
Soft sedimentary rock - 110 to 150 17 to 23 25 35 20000 - 1000-
400000 20000
sandstone, coal, chalk, shale
* Higher friction angles in cohesionless materials occur at low confining or normal
stresses as discussed in Chapter 5.
** For intact rock, the unit weight of the material does not vary significantly between
saturated and dry states with the exception of materials such as porous sandstones.