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INTRODUCTION Session 1 – 2 Course: S0825/Foundation Engineering Year: 2009.

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Presentation on theme: "INTRODUCTION Session 1 – 2 Course: S0825/Foundation Engineering Year: 2009."— Presentation transcript:

1 INTRODUCTION Session 1 – 2 Course: S0825/Foundation Engineering Year: 2009

2 Bina Nusantara GENERAL SCOPE OF THE COURSE Introduction (Definition, type of foundation, review of Soil Mechanics Principles) Bearing Capacity of Soil Shallow foundations (type, design and settlement of foundation) Sheet Pile Structure (lateral earth pressure, design of sheet pile) Deep Foundation (Single pile, Group pile, settlement of pile) Installation of pile and test of pile capacity Application of shallow, deep foundation and sheet pile structure

3 Bina Nusantara GENERAL Grading Policy Home Work ………........................ 20% Mid Semester Test ……………….30% Final Test …..................................50% TOTAL..................... 100% Note: Appropriate changes to this grading policy may be made with student consent.

4 Bina Nusantara REFERENCE TEXTBOOK

5 Bina Nusantara REFERENCE TEXTBOOK SUPPORTING TEXTBOOK

6 Bina Nusantara COURSE 1 Content: Definition Design Criteria Soil investigation, laboratory tests and soil properties related to structure designs

7 Bina Nusantara What is Foundation Engineering? The art of selecting, designing, and constructing structural support systems based on scientific principles of soils and engineering mechanics incorporating accumulated experience with such applications. A scientifically Acceptable Answer DEFINITION

8 Bina Nusantara DEFINITION What is Foundation Engineering? Foundation Engineering is the art and science of molding materials we do not fully understand into shapes we can not precisely analyze to resist forces we can not accurately predict, all in such a way that the society at large is given no reason to suspect of our ignorance. Not so scientifically Acceptable Answer – addopted from Coduto

9 Bina Nusantara Retaining Structure

10 Bina Nusantara FOUNDATION TYPES Shallow Foundations. Shallow foundations are usually placed within a depth D beneath the ground surface less than the minimum width B of the foundation. Shallow foundations consist of spread and continuous footings, wall footings and mats.

11 Bina Nusantara FOUNDATION TYPES Deep Foundations. Deep foundations can be as short as 15 to 20 ft or as long as 200 ft or more and may consist of driven piles, drilled shafts or stone columns. A single drilled shaft often has greater load bearing capacity than a single pile. Deep foundations may be designed to carry superstructure loads through poor soil (loose sands, soft clays, and collapsible materials) into competent bearing materials. Even when piles or drilled shafts are carried into competent materials, significant settlement can still occur if compressible soils are located below the tip of these deep foundations.

12 Bina Nusantara DESIGN CRITERIA THE DESIGN SHOULD BE: - SAFE - RELIABLE - DURABLE - BUILDABLE - ECONOMIC

13 Bina Nusantara DESIGN DATA SOIL DATA GROUND WATER DATA GEOMETRY DATA DATA OF LOAD

14 Bina Nusantara SOIL DATA DETERMINED FROM: - FIELD INVESTIGATION - CPT - SPT - VANE SHEAR TEST - PRESSUREMETER TEST - LABORATORY TEST - INDEX TEST - TRIAKSIAL - DIRECT SHEAR - UNCONFINED - CONSOLIDATION

15 Bina Nusantara ADVANTAGES – Could be used to identify soil types visually – Could be used to get qualitative soil properties by empirical correlation LIMITATION – The soil strength profile can not be measured continuously – The high accuracy is needed during investigation in case of weight and fall height of hammer STANDARD PENETRATION TEST (SPT)

16 Bina Nusantara HAMMER OF SPT

17 Bina Nusantara DIMENSION OF SPT TUBE

18 Bina Nusantara SPT EXECUTION

19 Bina Nusantara SPT PROFILE (EXAMPLE)

20 Bina Nusantara TYPES OF TOOL AND PRINCIPLE OF WORK – Mechanical friction-cone penetrometer by pushing a cone with projection area 10 cm 2 and 60 o angle and standard velocity 20 mm per-second. 2 measurement parameters each 20 cm of depth: Cone Resistance (q c ) Local Friction (f s ) – Electric friction-cone penetrometer measure the cone pressure and continuously friction with better accuracy level CONE PENETRATION TEST (CPT)

21 Bina Nusantara CONE PENETRATION TEST (CPT) ADVANTAGES – Continuous Soil strength profile – Give fast description of soil – Simple LIMITATION – The accuracy is bad for soil with some stones – Mechanical friction-cone penetrometer is less sensitive when applied in very soft clay

22 Bina Nusantara CONE DIMENSION (ASTM D3441)

23 Bina Nusantara ELECTRIC CONE DIMENSION

24 Bina Nusantara CPT RESULT (EXAMPLE)

25 Bina Nusantara LABORATORY TESTS Soil Index ( , , e, GS dll.) – Measuring of volume and mass of sample – Sieve analysis test – Atterberg Test Shear Strength of Soil (c,  ) – Triaksial Test (UU, CU, CD) – Direct Shear – Unconfined Compression Test Compressibility (Cc, Cv) – Consolidation Test Permeability (k) – Constant Head – Falling Head

26 Bina Nusantara EMPIRICAL CORRELATION SPT Data Sandy SoilClay or Silt N-ValueRelative DensityN-ValueConsistency 0 – 4Very loose0 – 2Very soft 4 – 10Loose2 – 4Soft 10 – 30Medium4 – 8Medium stiff 30 – 50Dense8 – 15Stiff > 50Very dense15 – 30Very stiff > 30Hard

27 Bina Nusantara EMPIRICAL CORRELATION CPT Data

28 Bina Nusantara EMPIRICAL CORRELATION Between Soil Properties – Cc = 0,009 (LL – 10) – Cu = qu/2 – Cu = 19 – 23 CBR (C in kN/m 2 )


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