Geotechnical Engineering

Teacher

Dr. Jyoti Prakash Giri

Core Courses

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Code(Credit) : CUTM1073(1-1-1)

Course Name : Geotechnical Engineering

Course Objectives

Understand the principles of soil mechanics and their application in engineering.
Develop practical skills in soil testing and analysis for accurate characterization of soil properties.
Apply soil mechanics principles to design and analyze foundations, evaluate soil stability, and solve geotechnical engineering problems.

COs	Course outcomes	Mapping COs
CO1	Understand the fundamental engineering knowledge of soil mechanics, including identifying the nature and behavior of soil, soil classification, and compaction investigation for low quality soil.		Engineering knowledge PO1 [3], Problem analysis PO2 [2]
CO2	Able to do hands-on practice for design the geo-environmental problem and be able to think of its solution related to soil.		Design /development of solutions PO3 [3]
CO3	Able to develop skill to design foundation considering the behavioural investigation of soil.		Conduct investigations of complex problems PO4 [3]
CO4	Able to enhance project formulation skill for the soil-structure interaction design using modern tools.		Modern tool usage PO5 [3]
CO5	Able to assess the stability of slopes and retaining structures by analyzing earth pressures based on engineering solutions and environmental contexts.		Conduct investigations of complex problems PO4(2), Environment and sustainability PO7(3)

Course Syllabus

Module 1: INTRODUCTION (5hrs)

Soil formation - soil structure and clay mineralogy - Adsorbed water - Mass- volume relationship - Relative density.

Grain size analysis - Sieve and Hydrometer methods - Consistency Limits and Indices - I.S. Classification of soils

Practice Sessions:

Determination of water content of soil (1hrs)
Determination of specific gravity of soil (1hrs)
Grain size analysis by sieving (Dry sieve analysis) (1hrs)

Module 2: PERMEABILITY & SEEPAGE THROUGH SOILS (6 hrs)

Soil water - capillary rise - flow of water through soils - Darcy’s law- permeability - Factors affecting - Determination of coefficient of permeability - Permeability of layered systems.

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

Practice Sessions:

Determination of Atterberg limits of soil: (a) liquid limit, (b) plastic limit, (c) shrinkage limit (2 hrs)
Measurement of unit weight of soil in the field: (a) Core cutter method, (b) Sand replacement method (2 hrs)

Module 3: COMPACTION & CONSOLIDATION (5hrs)

Mechanism of compaction - factors affecting - effects of compaction on soil properties. Field compaction Equipment - compaction control.

Stress history of clay; e-p and e-log p curves - magnitude and rate of 1-D consolidation- Terzaghi’s Theory.

Practice Sessions:

Determination of field density by sand replacement method. (1hrs)
Determination of consolidation properties of soils. (1:15mins)
Determination of unconfined compressive strength of soil (1:15mins)

Module 4: SHEAR STRENGTH & STRESS DISTRIBUTION OF SOILS (6hrs)

Mohr - Coulomb Failure theories, Normal and shear stresses on a plane, Boussinesq's solution.

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 5: DESIGN OF SHALLOW & DEEP FOUNDATIONS (7hrs)

Introduction, Different types of shallow foundations, Different types of deep foundations, Design methodology for piles.

Practice Sessions:

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 6: FOUNDATIONS IN DIFFICULT GROUNDS (4 hrs)

Introduction, Techniques of ground improvement, Foundations in swelling soil, Foundations in collapsible soil, Use of soil reinforcement, machine foundations, Free and forced vibration, Lysmer’s method, dynamically loaded foundations, Dynamic soil properties, Vibration isolation. BASIC APPRAISAL ONLY.NO NUMERICAL PROBLEMS

Practice Session:

Determination of shear parameters by Direct shear test (1hrs)
Determination of compaction properties by standard proctor test. (1hrs)
Determination of shear parameters by Tri-axial test. (1hrs)

Module 7: EARTH PRESSURE & RETAINING STRUCTURES (2hrs)

Types of Earth pressure. Rankine’s Active and passive earth pressure, Smooth Vertical wall with horizontal backfill. Extension to Soil, Coulombs wedge theory, 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

Soil formation - soil structure and clay mineralogy - Adsorbed water - Mass- volume relationship - Relative density.

S-1

Video Link

Session 2

Grain size analysis - Sieve and Hydrometer methods - Consistency Limits and Indices - I.S. Classification of soils.

S-2

Video link

Practical 1 & 2

Determination of specific gravity of soil (1hrs)

3. Grain size analysis by sieving (Dry sieve analysis)

Session 3

Soil water - capillary rise - flow of water through soils - Darcy’s law- permeability - Factors affecting - Determination of coefficient of permeability - Permeability of layered systems.

S-3

Video link