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51-1-10052-031
APPENDIX B
GEOTECHNICAL ANALYSIS AND DESIGN
OF GROUND ANCHORS
FOR SLOPE STABILIZATION
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51-1-10052-031-R2-ABx/wp/ADY 51-1-10052-031B-i
APPENDIX B
GEOTECHNICAL ANALYSIS AND DESIGN
OF GROUND ANCHORS
FOR SLOPE STABILIZATION
TABLE OF CONTENTS
FIGURES
Calculation Summary (Sheets 1 thru 30)
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CALC. NO: 1
JOB NO: 51-1-10052-031
PROJECT: White Point Landslide Repair, San Pedro, Los Angeles, CA # SHEETS: 30
CLIENT: City of Los Angeles SUBJECT:
Problem:
General Approach / Assumptions:1.
2.
3. Calculate required bonded length of ground anchors using the Post-Tensioning Institute (PTI) procedure.
4.
.
Sources of Data and Equations:1.
2.
3
4
Post-Tensioning Institute (PTI) (1996), "Recommendations for Prestressed Rock and Soil Anchor".
Southern California Earthquake Center (2002), "Recommended Procedures for Implementation of DMG Special
Publication 117: Guidelines for Analyzing and Mitigating Landslide Hazards in California".
CALCULATION SUMMARY
Geotechnical analysis and design of ground anchors for slope stabilization.
Review site topographic and boring location plan, boring logs, and lab test data develop at engineering
strength parameters for use in analysis.
Ground Anchors for Slope Stabilization (Draft 100% Submission)
Calculate allowable soil bearing pressure for concrete bearing elements for ground anchors using Brinch
Hansen's bearing capacity formula for inclined ground surface.
Analyze and design ground anchors for slope stabilization using slope stability analysis program "SLOPE-
W".
Coduto, D. P. (1994), "Foundation Design: Principles and Practices".
Shannon and Wilson, Inc (2012), "Final Geotechnical Report, White Point Landslide", August 15, 2012.
5
Summary and Conclusions:
Page No. of sheets1 1
2 1
3 1
4 1
5 Estimate Anchor Bonded Lengths 1
6 2
8 8
16 4
20 Seismic Slope Displacement Analysis 3
23 Strand Anchor Structural System (Catalog Cut) 8
Preliminary Calc.: x Draft 100% Submission
Final Calc.: Supercedes Calc. No:
REV. NO. CALCULATION BY DATE CHECKED BY DATE
JXM/NXN RTD 2/21/2013
Shannon and Wilson, Inc (2012), "Final Addendum Geotechnical Report No. 1, White Point Landslide", December 19,
2012.
Summary Table - Ultimate Bond Strength between Rock and Grout
Material Strength Summary
2/20/2013
Description
Conceptual Design - Rock Anchors
Cover Sheet
Summary of Results of Slope Stability Analysis
Slope Stability Analysis using SLOPE-W
Anchor Bearing Element Design
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WHITEPOINTLANDSLIDESTABILIZATION
TABLE2
SUMMARYOFRESULTSOFSLOPESTABILITYANALYSIS
Section Case Number Postt en si on in g S tati c
H:V Angle of Rows Horizontal Vertical LoadperAnchor(1)
Factorof YieldAcceleration Max.Equ
Safety ofSlope,ky(3)
Acceleratio
(degrees) (ft) (ft) (kips) (g) (g
L L' Noslopedewatering/drain pipes(8)
1.3 0.043 0.1
Slopedewatering/drain pipes@20ft 1.48 0.055 0.1
6 0.6"dia.sevenwirestrands,ASTMA416,270ksi 1:1 45 2 20 20 210 1.58 0.063 0.1
(w/dewatering/drain pipes@20ft) 3 20 20 210 1.64 0.067 0.1
4 20 20 210 1.70 0.072 0.1
13 0.6"dia.sevenwirestrands,ASTMA416,270ksi 1:1 45 2 20 20 458 1.72 0.073 0.1
(w/dewatering/drain pipes@20ft)
M M' Noslopedewatering/drain pipes(8)
1.33 0.042 0.1
Slopedewatering/drain pipes@20ft 1.66 0.068(10)
0.1
6 0.6"dia.sevenwirestrands,ASTMA416,270ksi 1:1 45 2 20 20 211 1.75 0.078(10)
0.1
(w/dewatering/drain pipes@20ft)
Notes (1)Loadisassumedtobelessthanorequalto60%oftheanchorultimatecapacity.
(2) "RecommnededProceduresforImplementationofDMGSpacialPublication117:Guidelines forAnalyzingandMitigatingLandslideHazardsinCalifornia"bytheSouternCaliforniaEarthqua
(3)Thegroundaccelerationthatcausestheslopetoyieldorhaveafactorofsafetyofunityagainstslopefailure.
(4)Groundaccelerationdemand
(5)AllowabledisplacementrecommendedfromDMGSpecialPublication117.
(6)1cm=0.4inch;1inch=2.54cm.
(7)SlopedisplacementisestimatedusingBrayetal(1998)asrecommendedinDMGSpecialPublication117.
(8)
Hydrostatic
pressure
is
at
30
percent
of
the
height
of
the
near
vertical
tension
cracks.(9)GLEmethodisusedtocomputethefactorofsafetyagainstslopefailureunlessnoted.
(10)JanbumethodisusedinlieuofGLEmethodduetononconvergentsolution.
RockAnchor Slope
Inclination Spacing
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