I-210 Interchange at Cove Lane 1 - Down and...I-210 Interchange at Cove Lane ... Shallow Foundation Deep Foundation ... Geotechnical Investigation Influenced Design and Construction

I-210 Interchange at Cove Lane A Geotechnical Perspective

Larry D. Sant, PE

Associate & Geotechnical Engineer

Overview

Project Background

Exploration & Geology

Design & Construction • Settlement & Stability

• MSE Walls

• Foundations

Project Background

Project Location and Need

North $

Project Need

Prien Lake

Fast-Track Schedule

First Contact: Aug 2012

Bid & Letting: Spring 2013

Groundbreaking: Fall 2013

Completed: Spring 2015

7

Design Concept

8

Exploration and Geology

10

1953

11

1963

12

1968

13

1994

14

2010

Site Geology

Geotechnical Investigation • 4 weeks of explorations

• 40 drilled soil borings

• 85 Cone Penetration Tests

(CPTs)

• 11,200 linear feet

• Large field effort • 3 Drill Rigs

• 2 CPT Rigs

• 1 Pontoon Drill Rig

• Lab testing complete a few

weeks after exploration

(occur simultaneously)

Subsurface Explorations

0.5 Miles

Subsurface Profile

Undifferentiated Alluvium

Pleistocene-Era Coastal

North

0.5 Miles

Exploration Results

Design and Construction Overview

Overview of Design & Construction

North

0.5 Miles

Embankment

Bridge over Canal

Mechanically Stabilized Earth Wall

Undifferentiated Alluvium

Pleistocene-Era Coastal

Shallow Foundation

Deep Foundation

Ground Improvement

Settlement & Stability

MSE Walls

Foundations & Ground Improvement

Construction Sequence to Maintain Traffic

North

0.5 Miles

Phase I: Northern Ramps Phase II: Eastbound Mainline

Construction Sequence to Maintain Traffic

North

0.5 Miles

Phase I: Northern Ramps Phase II: Eastbound Mainline

Phase III: Westbound Mainline

Design and Construction Settlement and Stability

Settlement Prediction

Stability Evaluation

Ground Line

Planned Embankment Load

Additional Surcharge

Wick Drains

28 feet

12 feet

16 feet

24 weeks

14 weeks

Staged Loading: Embankment

Staged Loading: Settlement

30

Wick Drain Installation

31

Preload and Surcharge Lifts

Areas of Project Design

Embankment Settlement

Design and Construction MSE Walls

Stability Evaluation

MSE Wall Construction

39

MSE Wall Record

Design and Construction Foundations and Ground Improvement

Load Transfer Platform

Mechanically Stabilized Earth (MSE) Wall

Ground Line

Deep Foundation: Driven Timber Piles

Pile Design

Pile Capacities

Typical Timber Pile Design:

20-25 Ton (40-50 kips)

Project Timber Pile Design:

60 Ton (120 kips)

Project Concrete Pile Design: 150 Ton (300 kips)

LRFD: Resistance Factor = 0.75

Deep Foundation: Driven Piles

1-foot Marked Increments

Wave Equation Analysis (WEAP)

Pile Installation Observation

49

Static Load Tests

3*Design Load

LA DOTD and ASTM Method

Static Load Test

0.00

0.10

0.20

0.30

0.40

0.50

0.60

0 100 200 300 400 500 600 700

Dis

pla

cem

ent

(in

ches

)

Load (kips)

SES Measured Displacement SES Dial DisplacementUltimate Capacity 3*Design LoadDavisson Criterion

Static Load Test Results

Dynamic Pile Testing

Initial Drive and Restrike

52

Pile Driving Analysis

53

H160-1 End of Initial Drive 60’ Timber Pile 14” Butt Diameter 8.25” Toe Diameter Refused at 51’ penetration

CAPWAP

Dynamic Test Results

• 60’ Timber Pile • 14” Butt Diameter • 8.25” Toe Diameter • Refused at 51’ penetration • Blow Count at End of Initial

Drive = 25 blows/4”

H160-1 End of Initial Drive

55

H160-1 End of Initial Drive H160-1 Beginning of Restrike

25 blows/4” 32 blows/1” 54 Minutes Setup

y = 1.7823x

0

50

100

150

200

250

300

0 50 100 150 200 250 300

Cap

acit

y, R

estr

ike

(kip

s)

Capacity, End of Initial Drive (kips)

Timber Pile Setup

57

59

Cline Canal Bridge

Record Keeping and Documentation

Standard Reports - Daily Field Reports - Pile Driving Logs

Project Specific Visual Tracking - MSE Wall

- Pile Driving

Communication (Summarized Daily Results)

Statistical Analysis (Dispute Resolution)

Documentation

Pile Locations Completed

64

Conclusions

Conclusions

Aggressive Schedules Can Be Met

Geotechnical Investigation Influenced Design and Construction (know your site conditions) – Embankment Settlement

– Stability

– Driven Pile Designs

Pile Testing Saves Budget

Keeping Good Records Prevents Doubt and Confusion

67

Questions?

Questions?

Cypress Roots