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. Sel/ introduction

. &arget 'audience+0 government o//icers

engaged in planning design construction

and maintenance o/ 'road+ bridges with

someor little (nowledge o/ geotechnical

engineering and investigations

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Your senior officers

Your subordinates

YOU

A/EConsultant

GeotechnicalConsultant

Soil investigation

companies

Constructioncompanies

1ield wor( //ice wor(

3ess Moreengineering

education

4aw

in/ormation

Interpretation

application

implicitknowledgefadingaway

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terminolog

Subsurface

investigations

. Soil investigation

. Geotechnical

investigation

. Soil surve

Ground surface and

subsurface investigations

.Site investigation

.Site surve

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schedule

. Morning "!0!! 6 "20#!

6 "!0"!-""0"! strategic consideration o/ geotechnical

investigation planning

6 ""02!-"20#! items o/ investigation

. 7/ternoon "80!! 6 "90#!

6 "80!!-"805! method o/ geotechnical investigation

6 "50!!-"505! evaluation o/ geotechnical data

6 "90!!-"90#! maintenance related sub*ects

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1oundation design0 purpose o/

geotechnical investigations

. Carring super-

structure loads

. &rans/erring the

loads to the ground

. :istributing theloads in controlled

manner

1unction o/ /oundations

. $ow to trans/er the

loads to the ground;

. $ow to distribute

stresses;

. $ow to controlstresses;

1oundation design

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>uestions be/ore during and a/ter soil investigation

Is the investigation enough;

6Step b step approach

6Modeling the ground with (nowledge o/

engineering geolog

6Engineering *udgment

No de/inite answer but we practice0

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Soil investigation is multi-stage process o/0

. btaining in/ormation on the subsoil

conditions. E?ploring identi/ing and @uanti/ing

potential geotechnical ris(s

. &he process continues during constructionand maintenance periods%

Step b step approach

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Modeling the ground with (nowledge o/

engineering geolog

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In/ormation /or engineering

geological *udgment. Geological maps

. &opographical maps

. Aegetation maps

. Satellite photos

. Borehole in/ormation sstems

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We have to conclude the investigation at a certain

point. However, we are not sure if the informationcollected is correct and sucient. The quantity ofdata obtained from the soil investigation is usuallynot as sucient as to allow us to statistically

determine the properties of every part of the ground.Do you worry if the soil property may be dierent at!m away from a borehole"

#nswer$ we use engineering %udgment &a good guessor professional guess' with imagination of the groundcondition based on scarce data.

Engineering *udgment

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