round Anchors Final Addendum No2-Appendix B

7/24/2019 round Anchors Final Addendum No2-Appendix B

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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

Sheet 1 of 30


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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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round Anchors Final Addendum No2-Appendix B

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