Geotechnical Engineering

Teacher

Sunita Sahu

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Core Courses

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Code(Credit) : ABC01(1-1-1)

Course Name : Geotechnical Engineering

Course Objectives

  • • Perform Moisture content, Specific gravity, Atterberg limits tests.
    • Perform Grain size distribution, Proctor tests.
    • Perform Unconfined compression, Triaxial tests.
    • Perform California Bearing Ratio, Vane Shear tests.
    • Perform Sand replacement, Core cutter, Permeability tests.

Learning Outcomes

  • • To obtain knowledge about soil properties and methods of soil properties determination in the laboratory, using field tests and considering comparable experience. Basic stability and deformation problems. Principle of spread and deep foundation design. To understand fundamental knowledge of geotechnical works for soil improvement, interaction of structure and subsoil. Basic design methods for excavation and foundation pits with dewatering and sealing systems.
    • Design and analyse Shallow foundations manually as well as using STAAD Pro
    • Design and analyse Deep foundations manually as well as using STAAD Pro
    • Carry out Moisture content, Specific gravity, Atterberg limits tests.
    • Carry out Grain size distribution, Proctor tests.
    • Carry out Unconfined compression, Triaxial tests.
    • Carry out California Bearing Ratio, Vane Shear tests
    • Carry out Sand replacement, Core cutter, Permeability tests.

Course Syllabus

Module I:(5hrs)
Theory:(2hrs)
(a) INTRODUCTION: Soil formation - soil structure and clay mineralogy - Adsorbed water - Mass- volume relationship - Relative density.

(b) INDEX PROPERTIES OF SOILS: Grain size analysis - Sieve and Hydrometer methods - Consistency Limits and Indices - I.S. Classification of soils

(c) PERMEABILITY: Soil water - capillary rise - flow of water through soils - Darcy’s law- permeability - Factors affecting - Determination of coefficient of permeability - Permeability of layered systems

(d) SEEPAGE THROUGH SOILS: Total, neutral and effective stresses - quick sand condition - Seepage through soils - Flow nets: Characteristics and Uses (Basic appraisal only) .

Practice:( 3hrs )
1. Determination of water content of soil (1hrs)
2. Determination of specific gravity of soil(1hrs )
3. Grain size analysis by sieving (Dry sieve analysis) (1hrs)

Module II: (5hrs)

Theory:(1.5hrs)
(e) COMPACTION: Mechanism of compaction - factors affecting - effects of compaction on soil properties. Field compaction Equipment - compaction control.
(f) CONSOLIDATION: Stress history of clay; e-p and e-log p curves - magnitude and rate of 1-D consolidation- Terzaghi’s Theory.
Practice:(3:30hrs)
4. Determination of field density by sand replacement method.(1hrs)

5. Determination of consolidation properties of soils.(1:15mins)
6. Determination of unconfined compressive strength of soil(1:15mins)

Module III: (6hrs)

Theory:(1.5hrs)
(g) SHEAR STRENGTH OF SOILS: Mohr - Coulomb Failure theories

(h) STRESS DISTRIBUTION IN SOILS: Normal and shear stresses on a plane, Boussinesq's solution.
Practice:(1hrs)

7. Determination of shrinkage limit; Determination of permeability by constant head method (1hrs)
Project :(3:30 hrs)

• Types of shear strength test to be delivered as project mode, rest of the topics to be dealt in classroom teaching mode, Mathematical Derivations to be limited to classroom activity. They should not be a part of External Evaluation.

Module IV: (7hrs):

Theory:(1hrs)
(i)DESIGN OF SHALLOW FOUNDATIONS: Introduction, Different types of shallow foundations, (j)DESIGN OF DEEP FOUNDATIONS: Introduction, Different types of deep foundations, Design methodology for piles.

Practice: (1hrs)
8. California bearing ratio test (1hrs)
Project :(5hrs)
• Design calculation of shallow foundation to be done in project mode using STAAD Pro software.

• design calculation of pile capacity, Analysis of pile group, Settlement of pile group, Concept of negative skin friction, Piles subjected to lateral loads, Pile load test, Design and construction of well foundation. Design of cantilever sheet piles and anchor sheet piles to be done in practice mode as well as project mode using STAAD Pro software.

Module V: (4:30 hrs):
Theory:(2hrs)
(k) FOUNDATIONS IN DIFFICULT GROUNDS: Introduction, Techniques of ground improvement, Foundations in swelling soil, Foundations in collapsible soil, Use of soil reinforcement.

(l) MACHINE FOUNDATIONS: Introduction, Free and forced vibration, Lysmer’s method, dynamically loaded foundations, Dynamic soil properties, Vibration isolation . BASIC APPRAISAL ONLY.NO NUMERICAL PROBLEMS)

Practice:(2:30hrs)
9. Determination of shear parameters by Direct shear test(1:30hrs)
10. Determination of compaction properties by standard proctor test. (1hrs)

Module VI: (5 hrs)

Practice: (1 hrs)
11. Determination of shear parameters by Tri-axial test. (1hrs)

Project :(4 hrs)
• STABILITY OF SLOPES: soil stabilization measures. Slope stability solutions to done using software Stability analysis of rigid walls, (MATLAB)

Module VII:(2hrs)
(0) EARTH PRESSURE: Types of Earth pressure. Rankine’s Active and passive earth pressure, Smooth Vertical wall with horizontal backfill. Extension to Soil, Coulombs wedge theory.
(p) DESIGN OF RETAINING STRUCTURES: Introduction, Different types of retaining structures

E Books: Jain A K and Jain A K. 2005. Soil Mechanics and Foundations. Laxmi Publications (P) Ltd. New Delhi.
Ranjan Gopal and Rao A S R. 1993. Basic and Applied Soil Mechanics. Welley Easters Ltd., New Delhi.
Singh Alam. 1994. Soil Engineering Vol. I. CBS Publishers and Distributions, Delhi.

Session Plan

Session 1

module-1

Soil formation - soil structure and clay mineralogy - Adsorbed water - Mass- volume relationship - Relative density.
(30mins)
youtube link :-https://www.youtube.com/watch?v=Qh6wSfVN45s
slide link :-https://www.slideshare.net/SaurabhKumar464/4-clay-minerals-and-soil-structure
Grain size analysis - Sieve and Hydrometer methods - Consistency Limits and Indices - I.S. Classification of soils
(30mins)
module-2
Determination of field density by sand replacement method.
https://www.youtube.com/watch?v=pyyvTOExjrE
Determination of consolidation properties of soils.
https://www.youtube.com/watch?v=TMf5jOv4Y1I
module-3
SHEAR STRENGTH OF SOILS: Mohr - Coulomb Failure theories
https://www.youtube.com/watch?v=HUY8I6v6Ztk
STRESS DISTRIBUTION IN SOILS: Normal and shear stresses on a plane, Boussinesq's solution.
https://www.youtube.com/watch?v=KIVsd-ydCQI
youtube link :- https://www.youtube.com/channel/UC1A_poM_ksoafQJLc3Iu_Bg
slide link :-https://www.slideshare.net/DrAbdulmannanOrabi/lecture-4-classification-of-soil-67797553

module-4
DESIGN OF SHALLOW FOUNDATIONS: Introduction, Different types of shallow foundations
https://www.youtube.com/watch?v=frntXHVXkzI
DESIGN OF DEEP FOUNDATIONS: Introduction, Different types of deep foundations, Design methodology for piles.

https://www.youtuhttps://www.youtube.com/watch?v=5oiskGRv3_Qbe.com/results?search_query=DESIGN+OF+DEEP+FOUNDATIONS%3A+Introduction%2C+Different+types+of+deep+foundations%2C+Design+methodology+for+piles.
module-5
FOUNDATIONS IN DIFFICULT GROUNDS: Introduction, Techniques of ground improvement, Foundations in swelling soil, Foundations in collapsible soil, Use of soil reinforcement.
https://www.youtube.com/watch?v=5oiskGRv3_Q
MACHINE FOUNDATIONS: Introduction, Free and forced vibration, Lysmer’s method, dynamically loaded foundations, Dynamic soil properties, Vibration isolation
https://freevideolectures.com/course/2674/foundation-engineering/23
module-6
Determination of shear parameters by Tri-axial test
https://www.youtube.com/watch?v=fiNYDNuYpaA
module-7
EARTH PRESSURE: Types of Earth pressure. Rankine’s Active and passive earth pressure, Smooth Vertical wall with horizontal backfill. Extension to Soil, Coulombs wedge theory.
https://www.youtube.com/watch?v=JGzoZ2dbmCU
DESIGN OF RETAINING STRUCTURES: Introduction, Different types of retaining structures
https://www.youtube.com/watch?v=kTMirEjaIoo

Session 2

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