NCHRP Report 697:

Design Guidelines for Increasing the Lateral Resistance of Highway-Bridge Pile Foundations by Improving Weak Soils

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Size: 118 pages, 8.5 x 11

Publication Year:2011

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Authors:
Dan Brown; Kyle Rollins; Transportation Research Board
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TRB's National Cooperative Highway Research Program (NCHRP) Report 697: Design Guidelines for Increasing the Lateral Resistance of Highway-Bridge Pile Foundations by Improving Weak Soils examines guidance for strengthening of soils to resist lateral forces on bridge pile foundations.

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Table of Contents
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Front Matter	i-x
Summary	1-2	(skim)
Chapter 1 - Introduction	3-4	(skim)
Chapter 2 - Available Ground Improvement Case Histories and Approaches	5-13	(skim)
3.2 Geotechnical Site Characterization	14-14	(skim)
3.3 Single Pile Test in Untreated Soil	15-22	(skim)
3.5 Pile Group Testing Procedure	23-24	(skim)
3.6 Pile Group Tests in Untreated Clay	25-31	(skim)
3.7 Pile Group Load Tests Involving Jet Grouting	32-35	(skim)
3.8 Pile Group Load Tests Involving Soil Mixing	36-36	(skim)
3.9 Pile Group Load Tests Involving Flowable Fill	37-38	(skim)
3.10 Pile Group Load Tests Involving Excavation and Replacement	39-47	(skim)
3.11 Summary of Increased Resistance from Soil Improvement Methods and Cost Considerations	48-50	(skim)
Chapter 4 - Finite Element Modeling of Single Pile Load Test	51-53	(skim)
5.1 Pile Group FEM Mesh Design	54-55	(skim)
5.3 Pile Group Model in Virgin Clay with Excavation	56-56	(skim)
5.5 Pile Group Model with Jet Grouting	57-60	(skim)
6.2 Mass Mix Depth Effect (Below the Cap) on Lateral Resistance	61-64	(skim)
6.3 Mass Mix Length Effect (Beside the Cap) on Lateral Resistance	65-65	(skim)
6.4 Jet Grout Depth Effect (Beside the Cap) on Lateral Resistance	66-67	(skim)
6.6 Jet Grout Length Effect (Beside the Cap) on Soil Improvement	68-70	(skim)
6.7 Material Strength Effect on Lateral Pile Group Resistance	71-71	(skim)
6.8 Conclusions Based on Parametric Studies	72-75	(skim)
7.2 Comparison with Results from Tests in Virgin Soil	76-78	(skim)
7.4 Development of Simplified Method	79-84	(skim)
7.5 Evaluation for Jet Grouting Cases	85-88	(skim)
7.6 Design Recommendations	89-95	(skim)
Chapter 8 - Conclusions	96-96	(skim)
References	97-98	(skim)
Appendix A - Schematic Drawings Showing the Layout of the 16 Lateral Pile Group Tests	99-107	(skim)
Abbreviations used without definitions in TRB publications	108-108	(skim)

Description

TRB's National Cooperative Highway Research Program (NCHRP) Report 697: Design Guidelines for Increasing the Lateral Resistance of Highway-Bridge Pile Foundations by Improving Weak Soils examines guidance for strengthening of soils to resist lateral forces on bridge pile foundations.

The report presents computational methods for assessing soil-strengthening options using finite-element analysis of single piles and pile groups and a simplified approach employing commercially available software.

NCHRP Report 697:

Design Guidelines for Increasing the Lateral Resistance of Highway-Bridge Pile Foundations by Improving Weak Soils

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