Drilled Shaft Instrumentation and

Lateral Load Testing

Ironton-Russell Bridge over the Ohio

River

ODOT OGE Workshop

Jamal Nusairat, Ph.D., P.E.

May 7, 2013

Presentation Outline

• ODOT Research on Rock Socketed

Drilled Shafts

• Lateral Load Test Special Provision

• Instrumentation and Testing

• Lateral Load Test Results

Ohio Bedrock – Map of Testing

Calcareous

Shales

Non-

Calcareous

Shales

Limestone

and Dolomite

Shales and

Sandstone

Red

Shales

= Test Completed

= Proposed

LEGEND

= Pressuremeter

The bedrock map is from the ODNR website

A New Correlation for Em based on GSI Classification ODOT SJN 134137: Design of Rock Socketed Drilled Shafts

A new correlation based on GSI rock classification system was proposed using data from Nicholson and Bieniawski (1990) and Ironton-Russell test data

Em=Ei exp(GSI/21.7) / 100

Proposed Em Correlation Based on GSI Classification

0.0

20.0

40.0

60.0

80.0

100.0

0 20 40 60 80 100

GSI

Em

/Ei (

%)

Bieniawski (1978)

Serafin and Pereira (1983)

Ironton-Russell

Regression

Em/Ei=exp(GSI/21.7)/100

Lateral Load Test Submittal

Test Planning and Preparation

Test Planning and Preparation

Test Planning and Preparation

Subsurface Profile Subsurface Profile

Rock Coring

Boring B-7 rock core run 1 and 2.

Subsurface Profile Pressuremeter Testing

Subsurface Profile Pressuremeter Testing

Subsurface Profile Pressuremeter Testing

Subsurface Profile Pressuremeter Testing

c

p

v

1vv12

b

m0

RRE

Interpreting Dilatometer Test Data

Dilatometer Test Results

Unconfined Compressive Strength Test Results

Testing Summary

Comparison of Dilatometer Modulus Vs. Unconfined Compression Modulus

Average dilatometer modulus, Emass = 569 ksi

Average unconfined compressive strength modulus, Ecore = 1,670 ksi

Modulus reduction ratio, Emass/Ecore = 0.34

For RQDavg = 84%, the modulus reduction ratio compares favorably with Bieniawski (1984)

Test Shaft 1 Proof Cores

Type of

Instrument

Sister

Bar

(each)

Load

Cell

(each)

Inclinomet

er Tube

(ft.)

Tiltmete

r

Survey

Prisms

Dial

Gages

Test Shaft #

1

26 ft. Deep

Socket

22 1 75 1 4 1

Test Shaft #

2

18 ft. Deep

Socket

22 65 1 4 1

Total

Quantity 44 1 140 2 8 2

Instrumentation used for lateral load test

Test Shafts Instrumentation

Test Planning and Preparation

Test Planning and Preparation

Test Planning and Preparation

Test Planning and Preparation

Test Planning and Preparation

Test Results - Deflection

Test Results - Deflection

T.S. # 1 T.S. # 2

Test Results - Deflection

Test Results - Deflection

Test Results – Tilt Angle

Layer

No.

Top

Elev.

(ft.)

Bottom

Elev.

(ft.)

Unit

Wt.

(pcf)

Elasticity

Modulus

(psi)

Uniaxial

Compressive

Strength

(psi)

RQD

(%)

Notes

1 473 469 140 10000 6400 97 Weathered

Sandstone

2 469 457 140 120000 9000 100 Unweathered

Sandstone

3 457 450 135 5000 250 75 Coal/claystone

4 450 ? 140 120000 9000 100 Unweathered Sandstone

Selected Parameters to Match the Deflection from Lateral Load Test

LPILE Results