PERMFILE71577

• Permit No: C1982057
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: SUPPLEMENTAL GEOTECHNICAL INVESTIGATION FOR HAUL ROAD G
• Section_Exhibit Name: TAB 13 ATTACHMENT 13-3B
• Media Type: D
• Archive: No

•
FIGUR~ •
SUMMARY OF SLOPE DESIGN PROCEDURES
Categor~__ Proc edure_ Best Apelication _^__ _Limitation ___ Remarks
Avoid Problem Relocate Highway As an alternative anywhere Has none if studied during Detailed studies of proposed
planning phase; has large relocation should ensure
cost if location is selected improved conditions
and design is compf et e;
also has large cos[ if recon-
struction is required.
Completely or partially Where small volumes of ex- May be costly to control ex- Analytical studies must be
remove unstable ma- cavation are involved and cavation; may no[ be best performed; depth of excava-
teri als. where poor soils are en- alternative for large slides: Lion must be sufficient to
countered at shallow may not be feasible because ensure firm support.
c.
depths. of right-of-way requirements.
Bridge At sidehill locations with Nay be costly and not provide Analysis must be performed
shallow-depth soil move- adequate support capacity for anticipated loadings as
menu for lateral thrust. well as structural capability
to restrain landslide mass.
Reduce driving Change line or grade
forces
Drain surface
Drain subsurface
Reduced Yeight
During preliminary design
phase of project
In any design scheme;
must also be part of any
remedial design
On any slope where lowering
of groundwater table will
affect or aid slope stability
At any existing or potential
Will affect sections of road-
way adjacent to slide area.
Will only Correct surface in-
filtration or seepage due
to surface infiltration.
Cannot be used effectively
when sliding mass is im-
pervious
Requires lightweight ma-
Slope vegetation should be
considered in all Cases
Stability analysis should in-
clude consideration of
seepage forces
Stability analysis must be