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FOUNDATIONENGINEERING
B.TECHVIISEMESTER
1
Prepared by
Mr. N. Venkat Rao, Associate Professor, Dept. of CE, IARE
UNIT- I
SOILEXPLORATION
2
SUB SOIL EXPLORATION
3
• The process of collection soil data for the assessment soil
properties at a site through series of laboratory and field
investigation is collectively called Sub-soil Exploration
• Enables the engineers to draw soil profile indicating the
sequence of soil strata and the properties of soil involved.
COMMON STAGES IN SITE INVESTIGATION
4
• Desk Study
• Site Reconnaissance
• Field Investigations
• a) Preliminary Ground Investigation
• b) Detailed Ground Investigation
• Laboratory Testing
• Report Writing
• Follow up Investigations during design &construction
• Appraisal of performance
PURPOSE OF SOIL INVESTIGATION
5
Site investigation provides first hand information for
• Selection of foundation type.
• Design of foundations.
• Contractors to quote realistic and competitive tenders.
• Planning construction techniques.
• Selection of appropriate construction equipment (especially
for excavation and foundations).
• Feasibility studies of the site.
• Estimating development cost for the site.
• Study of environmental impacts of the proposed
construction.
METHODS OF SOIL EXPLORATION
6
The methods to determine the sequence, thickness and lateral
extent of the soil strata and where appropriate the level of
bedrock.
The common methods include
Test pits
Shafts and audits
Boring or drilling
7
METHODS OF INVESTIGATION
TEST PITS
8
The excavation of test pits is a simple and reliable method.
• The depth is limited to 4-5m only.
• The in-situ conditions are examined visually
• It is easy to obtain disturbed and undisturbed samples
• Block samples can be cut by hand tools and tube samples can
be taken from the bottom of the pit.
To identify the groundwater conditions.
9
oAuger boring
Percussion boring
BORING OR DRILLING
• Boring refers to advancing a hole in theground.
• Boring is required for the following
• To obtain representative soil and rock samples for laboratory
tests.
• Performance of in-situ tests to assess appropriate soil
characteristics. Some of the common types of boring are as
follows
• Auger boring
• Wash boring
• Rotary drilling
• Core drilling
• Percussion drilling
AUGER BORING
• HandAuger
• MechanicalAuger
• It is the simplest method of boring used for small
projects in soft cohesive soils.
• For hard soil and soil containing gravels boring with
hand auger becomes difficult.
• Hand-auger holes can be made up to about 20m
depth, although depth greater than about 8-10m is
usually not practical.
10
HANDAUGER
11
• The length of the auger blade varies from 0.3-0.5m.
• The auger is rotated until it is full of soil, then it is with drawn
to remove the soil and the soil type present at various depths
isnoted.
• Repeated with drawl of auger for soil removal makes boring
difficult below 8-10m depth.
• The soil samples collected in this manner are disturbed
samples and can be used for classificationtest.
• Auger boring may not be possible in very soft clay or
coarse and because the hole tends to collapse when auger is
removed
(a) Helical (worm types) Augers ( b) Short flight Auger ( c ) post hole Auger
b c
12

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FE.pdf

  • 1. FOUNDATIONENGINEERING B.TECHVIISEMESTER 1 Prepared by Mr. N. Venkat Rao, Associate Professor, Dept. of CE, IARE
  • 3. SUB SOIL EXPLORATION 3 • The process of collection soil data for the assessment soil properties at a site through series of laboratory and field investigation is collectively called Sub-soil Exploration • Enables the engineers to draw soil profile indicating the sequence of soil strata and the properties of soil involved.
  • 4. COMMON STAGES IN SITE INVESTIGATION 4 • Desk Study • Site Reconnaissance • Field Investigations • a) Preliminary Ground Investigation • b) Detailed Ground Investigation • Laboratory Testing • Report Writing • Follow up Investigations during design &construction • Appraisal of performance
  • 5. PURPOSE OF SOIL INVESTIGATION 5 Site investigation provides first hand information for • Selection of foundation type. • Design of foundations. • Contractors to quote realistic and competitive tenders. • Planning construction techniques. • Selection of appropriate construction equipment (especially for excavation and foundations). • Feasibility studies of the site. • Estimating development cost for the site. • Study of environmental impacts of the proposed construction.
  • 6. METHODS OF SOIL EXPLORATION 6
  • 7. The methods to determine the sequence, thickness and lateral extent of the soil strata and where appropriate the level of bedrock. The common methods include Test pits Shafts and audits Boring or drilling 7 METHODS OF INVESTIGATION
  • 8. TEST PITS 8 The excavation of test pits is a simple and reliable method. • The depth is limited to 4-5m only. • The in-situ conditions are examined visually • It is easy to obtain disturbed and undisturbed samples • Block samples can be cut by hand tools and tube samples can be taken from the bottom of the pit.
  • 9. To identify the groundwater conditions. 9 oAuger boring Percussion boring BORING OR DRILLING • Boring refers to advancing a hole in theground. • Boring is required for the following • To obtain representative soil and rock samples for laboratory tests. • Performance of in-situ tests to assess appropriate soil characteristics. Some of the common types of boring are as follows • Auger boring • Wash boring • Rotary drilling • Core drilling • Percussion drilling
  • 10. AUGER BORING • HandAuger • MechanicalAuger • It is the simplest method of boring used for small projects in soft cohesive soils. • For hard soil and soil containing gravels boring with hand auger becomes difficult. • Hand-auger holes can be made up to about 20m depth, although depth greater than about 8-10m is usually not practical. 10
  • 11. HANDAUGER 11 • The length of the auger blade varies from 0.3-0.5m. • The auger is rotated until it is full of soil, then it is with drawn to remove the soil and the soil type present at various depths isnoted. • Repeated with drawl of auger for soil removal makes boring difficult below 8-10m depth. • The soil samples collected in this manner are disturbed samples and can be used for classificationtest. • Auger boring may not be possible in very soft clay or coarse and because the hole tends to collapse when auger is removed
  • 12. (a) Helical (worm types) Augers ( b) Short flight Auger ( c ) post hole Auger b c 12