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MICROFORMicropile Interstate Cooperative Research on Foundations and slOpe Reinforcement

Micropile Interstate Cooperative Research on Foundations and Slope

Reinforcement

International Center for Ground Improvement Polytechnic University

IWM, 2003

Dr. Donald A. Bruce Senior Research Advisor, ICGI

Mr. Gary M. Weinstein Research Fellow, ICGI

Prof. Ilan Juran Executive Director, ICGI

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MICROFORMicropile Interstate Cooperative Research on Foundations and slOpe Reinforcement

MICROFOR Goals & Partnership Structure

- -

Users(Owners & Clients)

Micropile Network Systems for Highway & Civil Infrastructure Applications

A Government Industry University Partnership for Research, Development, Testing and Performance Monitoring of

MICROFOR

Construction Industry

(Contractors &Suppliers)

International Academic,

ConsultingResearch &

Communities

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MICROFORMicropile Interstate Cooperative Research on Foundations and slOpe Reinforcement

MICROFOR Partners

Government-Infrastructure Agencies Industry

International Research Community

NYSDOT

ADSC

TechnicalUniversityMunich

PWRIJapan

FOREVERFrance

USAcademic

Community

CambridgeUnited Kingdom

Finland

WashingtonState

PANYNJ

State DOTs& FHWA

MICROFORMICROFOR

ICGIICGI

NYSDOT

ADSC

TechnicalUniversityMunich

PWRIJapan

FOREVERFrance

USAcademic

Community

CambridgeUnited Kingdom

Finland

WashingtonState

PANYNJ

State DOTs& FHWA

MICROFORMICROFOR

ICGIICGI

NYSDOT

ADSC

TechnicalUniversityMunich

PWRIJapan

FOREVERFrance

USAcademic

Community

CambridgeUnited Kingdom

Finland

WashingtonState

PANYNJ

State DOTs& FHWA

MICROFORMICROFOR

ICGIICGI

NYSDOT

ADSC

TechnicalUniversityMunich

PWRIJapan

FOREVERFrance

USAcademic

Community

CambridgeUnited Kingdom

Finland

WashingtonState

PANYNJ

State DOTs& FHWA

MICROFORMICROFOR

ICGIICGI

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MICROFORMicropile Interstate Cooperative Research on Foundations and slOpe Reinforcement

Research Team

AcademiaUS/France/UK/Finland

MICROFORBoard of Directors

IndustryADSCPWRI

IndustryCase Studies

Full-ScaleField Tests

Numerical & Reliability

Studies

State of Practice Review

RecommendationsFinal Report

ModelingInput

Calibration

R&D Needs Assessment

France,WSU &PWRI

IWM

PANYNJ

Research Results

France/Cambridge

UpdatedDesign

Guidelines

Centrifuge

Calibration

Industry Guidance

Parametric Studies

MICROFOR Research & Integration Flow Chart

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MICROFORMicropile Interstate Cooperative Research on Foundations and slOpe Reinforcement

Micropile Design Concepts

“Case 1.5”Case 1 Case 2

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MICROFORMicropile Interstate Cooperative Research on Foundations and slOpe Reinforcement

Foreseen Micropile Group Layout for Full-Scale Field Test

CONFIGURATION E

Lateral Load

R1.68m

CONFIGURATION A

CONFIGURATION B CONFIGURATION C

3d

3d

LoadLateral

CONFIGURATION D

1.5msquare

3d

3d

1.65m

1.38m

1.38m

LoadLateral

Lateral Load

2.50m

1.65m

2.50m

2.50m

30°3d

1.65m3d

1.38m

2.50m

Baseline

Reticulation

Slope StabilizationInclination

Foundation Support

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MICROFORMicropile Interstate Cooperative Research on Foundations and slOpe Reinforcement

Construction Industry Input

1. Type of Micropile to be Tested

2. Design Configuration (inclination, geometry, number, spacing, etc.)

3. Construction Details (pile cap connections, composite sections,

Recommendations for Full-Scale Field Testing

Review and Update of Engineering Manual

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MICROFORMicropile Interstate Cooperative Research on Foundations and slOpe Reinforcement

MICROFOR Research Objectives

Full-Scale Experiments Scalability

Design Geometrical

Configurations

Constructability

Economics

MICROFORResearch

Objectives

Behavior of the composite

Micropile reinforced soil systems

Effect of the maingroup and

network systemparameters

Basic load transfer

mechanisms

Engineering Guidelines &Performance Assessment of Foundations and

Slopes Reinforced with MicropileNetwork Systems

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MICROFORMicropile Interstate Cooperative Research on Foundations and slOpe Reinforcement

• Micropile systems offer large resistance to lateral loading by mobilizing the axial resistance of the piles, rather that the bending stiffness.

• Micropile systems offer cost-effective engineering solutions to urban infrastructure applications including underpinning which cannot be cost effectively resolved with conventional technology.

• Micropile systems offer flexibility in the design which can be cost effectively adapted to varying site conditions.

• Micropile systems offer high seismic resistance and innovative solutions to liquefiable soils

The focus must be on optimizing system performance through scalable and predictable design particularly for foundation retrofitting applications in the urban setting where other techniques cannot compete.

Take advantage of soil-pile-soil interaction (in addition to geotechnical and structural capacity). Do not disregard it and do not allow for it to handicap the design! And construction technology . . .Preliminary Feasibility Assessment

Why Hybrid Systems of Micropiles?

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MICROFORMicropile Interstate Cooperative Research on Foundations and slOpe Reinforcement

MICROFOR Organizational Structure

University of Lille

Cambridge

CERMES

WSU

Cornell

Polytechnic

PANYNJFHWA

ADSC

Contractors

State DOTS

NYSDOT

Mr. Gary Weinstein

Project ManagerICGI

Dr. Isam Shahrour

Senior ResearchAdvisor ICGI /

Secretary TC 17

Prof. Ilan Juran

Executive DirectorICGI

Dr. Donald Bruce

Senior Research Advisor ICGI /

Chair IWM.

Prof. Roger Frank

Senior ResearchAdvisor ICGI /

Technical DirectorFOREVER

MICROFORBoard of Directors

Co ChairMr. A. DiMillio FHWA

Mr. Tom Shantz State DOTs

ExecutiveCommittee

Co ChairDr. Donald BruceProf. Ilan Juran

ICGI

International Academic

Advisory Board

Industry Advisory Board