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BSS402 SITE INVESTIGATION

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Elma Dewiyana Ismail

on 14 April 2016

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Transcript of BSS402 SITE INVESTIGATION

BSS502
Building Technology 1

site investigation

ANSWER THESE QUESTIONS WHILE I
GO THRU THE PRESENTATION.

1. WHAT IS THE
PURPOSE
OF A SITE INVESTIGATION?
2.
OBJECTIVES
OF A SITE INVESTIGATION?
3. 3
IMPORTANT STAGES
OF SITE INVESTIGATION ARE:
4. LIST DOWN THE
PROCESS
OF CONDUCTING A SITE INVESTIGATION.
5. WHILE CONDUCTING A
DESK STUDY
(STAGE 1) WHAT INFORMATION IS REQUIRED?
6. FOR
WALK OVER SURVEY
, WHAT KIND OF INFORMATION SHOULD BE COLLECTED?
7. WHAT ARE THE MAIN OBJECTIVES OF A
DETAILED SOIL TEST
/ INVESTIGATION?
8. NAME 2
PRINCIPLES METHODS
OF INVESTIGATING THE GROUND?
PURPOSE

To determine the
site’s suitability
for building and the nature and the extent of preliminary work that will be needed

Why it is important?

It will show the
detailS OF many physical aspects
such as
subsoil composition
,
demolition
and the
legal aspects

such as planning permission, right of access and preservation order

objectives

To
assess the general suitability
of the site with the proposed works
To
help produce a design
which is adequate and economic
To
help overcome possible difficulties & delays
that may arise during construction period due to ground and other local conditions
To
predict possible changes
that may occur/cause of all changes in site condition
To
maximize potential
of the site

Information required from a site investigation:
Information
affecting the design of the structure:
shear strength and compressibility of the soil
Information
affecting the construction of the works:
the extent and properties of material to be excavated, or to be used for fill or for road bases or concrete aggregates
Information on
ground water conditions:
the level and seasonal variation of the water table, the pressures in the soil water, and the permeability of the soil.

PLANNING AN INVESTIGATION


In the earlier stages of an investigation, the information available is often inadequate to allow a detailed plan to be made.
The investigation must therefore proceed in
3 stages
:
1. Desk study
2. Site reconnaissance
3. Detail Examination of Tests
and Programs


INFORMATION/ISSUES TO CHECK
1. Site Location
Nearest town and city
Schools, emergency services, entertainment, recreation, shops, transport and employment
Distance from head office (client & builders) & traveling time
Distance from nearest railway station to the site

2. Accessibility
Approach and site access roads, width, gradient, bends, sharp corners, condition and construction relative to transport heavy plant and equipment
Bridges, strength, width and clearance height
Temporary roads, rolled metal tracts or consider preparing sub base for new roads as temporary access

INFORMATION/ISSUES TO CHECK
3. Availability of space
Site offices, canteen, stores and compound
Material storage areas and handling
Construction area and assembly areas
Plant location

INFORMATION/ISSUES TO CHECK
4. Services
Water, drainage, electricity, gas & telephone
Location will be determined from maps by consultation with the appropriate local authorities
An estimate of buildings usage is also for ascertaining the demand on sewers and drains

INFORMATION/ISSUES TO CHECK
INFORMATION/ISSUES TO CHECK
5. Ground composition
Boreholes are required to determine :
Changes in strata
Strength of subsoil
Toxicity of subsoil
Stability of excavation
Water table (depth below surfaces)

6. Site clearance and demolition
A plan of the site should indicate trees, shrubs and existing buildings and a site survey will reveal the extent of necessary leveling , demolition and excavation

INFORMATION/ISSUES TO CHECK
THE PROCESS OF SITE INVESTIGATION
Desk Study
Site Reconnaissance/ Walk over survey
Preliminary report or feasibility study
Preliminary Ground Investigation - Planning of main Preliminary report
Main Ground Investigation
Laboratory testing
Financial Report (Return of Investment)
Final report

DESK STUDIES
It is important to collect all
available information about the site
before starting work.
A desk study is the
collation and review of information
already available about a site, and is carried out at an early stage of site appraisal to inform and guide the remainder of the site investigation.

Collect as much material as possible about the site such as-
Maps
(geological, ordinance survey, etc)
Air photograph
Geological
books & journal
Mining records & reports
of previous site investigation
Library, news paper, adjacent buildings,
etc
DESK STUDIES
SITE RECOINAISSANCE / WALK OVER SURVEY
The initial document search should be followed
by a walk-over survey
of the site and its surroundings.
information needed from walk over survey:

Topography:
indications of slope instability, spoil heaps or signs of ground subsidence resulting from mining.
Geology:
exposures of soils and rocks which can be examined and sampled.
Surface water and ground water:
signs of flooding; springs; water logging
Vegetation:
signs of vegetation die-back or restricted vegetation as a result of contamination of the ground; presence of invasive species such as Japanese Knotweed; trees which may cause shrinkage and swelling of clay soils.

SITE RECOINAISSANCE / WALK OVER SURVEY

Ecology:
indicators of protected species, newts, badgers, bats, nesting birds.
Contamination:
indications of spills, disturbed ground, areas of fill or spoil heaps, old fuel or oil tanks.
Structures:
settlement of existing structures or the use of asbestos; indicators of archaeological value.
Local Knowledge:
anecdotal information on past uses of the site or past problems in the area.

Access & services:
information such as access for site equipment and location of buried or overhead services


DETAIL EXAMINATION OF TESTS AND PROGRAMS/ DETAILED EXPLORATION

The
principal objectives
of the detailed soil
test/investigation are as follows:
1. To determine in detail the
geological structure
of the site, including the thickness, sequence and extent of the strata.
2. To determine the
ground water conditions

DETAIL EXAMINATION OF TESTS AND PROGRAMS/ DETAILED EXPLORATION

3. To obtain
disturbed and undisturbed
samples for identification and laboratory testing
4. To
carry out tests
to determine the mechanical properties of the soil insitu

DETAIL EXAMINATION OF TESTS AND PROGRAMS/ DETAILED EXPLORATION

There are two principal methods of investigating the ground conditions
trial pits
boreholes
(details will be discussed more on "soil investigation topic")
Thank you..
Full transcript