Abdul Samad Abdul Rahman

Faculty of Civil Engineering

Universiti Teknologi MARA,

Shah Alam, MALAYSIA

SITE INVESTIGATIONfor BUILDING PLAN

LAYOUT

CONVENTIONAL APPROACH TO SI

At the end of this lecture/week, the students

will be able to :

LEARNING OUTCOMES

Learning Outcomes :

1. Understand the coverage of SI for building plan layout

2. Discuss the elements contain in the Desk Study

Week 2 : (3HL) Coverage : Planning SI for building

layout. Site Reconnaissance and Desk Study of the

Proposed Site.

1.0 Introduction of SI for building layout plan

2.0 Desk Study

3.0 Planning Scope of Site Investigation

OUTLINE of PRESENTATION

CONVENTIONAL APPROACH TO SI

SITE INVESTIGATION PLANNING

SITE INVESTIGATION PLANNING

SITE INVESTIGATION PLANNING

SI – an essential component of

Geotechnical Design

Scope of the guidelines

1.0 INTRODUCTION TO GUIDELINES

CONVENTIONAL APPROACH TO SI

Project brief with site & location plan

Topo maps for assessing the terrains

Geological maps for assessing the

geological formations

Aerial photos for assessing the site

Performance evaluation of existing roads

Review of all available information

2.0 DESK STUDY

CONVENTIONAL APPROACH TO SI

Possible issues to be encountered

Establish the purpose and need for SI

What soil properties required

Extent of ground to be investigated

Fund, time & site constraint

3.0 Planning Scope of SI

Having completed the desk study, the

following must be tackled before

embarking on the scope of work

CONVENTIONAL APPROACH TO SI

3.1 Building layout on Soft/Weak

Ground

3.2 Building layout on Slope & Hilly

Terrains

3.3 Cut Areas

3.4 SI for Structures

Typical geotechnical problems & usual

application of SI methods and tests

SSI …cont...

CONVENTIONAL APPROACH TO SI

Excessive total settlements

Excessive differential problems

Slope instability

3.1 Building layout on Soft/Weak Ground

SSI …cont.

Typical problems :

Analysis and design :

To check & determine bearing capacity

To check & determine slope stability

To check & determine amount & rate of

settlement

CONVENTIONAL APPROACH TO SI

OVERVIEW OF THE PROJECT

SLOPE RECTIFICATION WORKS

ON CUT SLOPE AREA AT

KOMPLEKS IMEGRESEN

PENGKALAN HULU, MUKIM

PENGKALAN HULU, PERAK

DARUL RIDZUAN

PROJECT BRIEF

• Client

Immigration Department of Malaysia

• Project Manager

Public Work Department

• Geotechnical Consultant

Kumpulan Ikram Sdn Bhd

• Project Cost - 2.5 Million

• Project Duration - October 2003-July 2004

SCOPE OF WORKS

• The Objective of Works To Be Carried Out:

-Understand subsurface condition

and geology at study area.

-Understand type of slope failure.

-Determine probable causes of failure.

-Propose mitigation measures.

SITE INVESTIGATION

PLANNING

•Desk Study

-Previous SI Report

-Borehole logs

-Laboratory Test Result

- Layout Plan

-Geology Map

-Topographic Map – Contour etc.

-Drainage System – Natural & Manmade

SITE INVESTIGATION

PLANNING

• Forensic Works

-Geological Study

- preliminary study and mapping

-Geotechnical Study

– soil type, soil strength, drainage

system.

-Engineering Geology Study

- ground profile.

RESULT OF FORENSIC

WORKS

Need Detail Investigation on Sub-Surface

• To carried out SI (Boreholes)

-3 locations

- 2 (Two) nos. of borehole along failure area (Adjacent crown and toe of

slope)

- 1 (One) nos. of borehole at non-

failure area.

• To carried out JKR Probe Test – 50 points

• To install Stand Pipe Piezometer – 3 locations

SUB-SURFACE

INVESTIGATION

• Borehole

-Three (3) nos. of borehole was drilled.

-Type of Drill - Rotary Wash Boring

-Criteria of terminating boreholes:

-BH 1Maximum depth 16.12m

-BH 2Maximum depth 10.05m

-BH 3Maximum depth 6.30m

-Distance BH1 to BH2 = 26m

-Distance BH2 to BH3 = 17m

• BoreLog

Boreholes

• Layout of each borehole

• Layout of failure area in 3D

• Why three location borehole has been

identified during this study.

-Mechanism and mode of failures

-Ground water condition

-Soil strength parameter

SOIL PROFILE OF THE SLOPE

• Section A-A

• Section D-D

• Section F -F

Summary of Subsurface Thickness According

To The Bore Logs

BH BH1 BH2 BH3

Reduced Level (m) 372.421 366.936 357.011

Residual Soil layer thickness (m) 1.50 - -

Completely Weathered of Interbedded Red

Shale, Sitlstone and Mudstone layer thickness

(m)

10.11 10.11 2.30

Moderately to Highly Weathered

Carbonaceous Shale thickness (m) before end

of borehole

4.51 5.55 4.00

Total depth of borehole (m) 16.12 10.05 6.30

CONVENTIONAL APPROACH TO SI