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# Geotechnical Engineering I Co

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### Geotechnical Engineering I Co

1. 1. Department of Civil Engineering University of Hawassa, Faculty of Technology Course Number CEng 2322 Course Title Geotechnical Engineering I Degree Program B.Sc. in Civil and Urban Engineering Module (No. & Name) 7 - Geotechnical Engineering Module Coordinator M. U. Jagadeesha Lecturer M U Jagadeesha ECTS Credits 5 Contact Hours (per week) Lecture Tutorial & Lab. & Home Total Seminars workshop Study contact practice Hrs. 2 0 3 5 5 Course Objectives & The student will be able to: Competences to be Acquired (a) Knowledge • Appreciate the necessity / scope / importance of Geotechnical engineering for civil and Urban Engineering. • Identify and appreciate the material soil • Understands soil’s physical and plasticity characteristics. • Understand the profound impact of presence of water in soil on its behavior. • Able to calculate quantum of flow through soil and energy dissipation across soil medium – (confined and unconfined flow through soil). • Have knowledge of compressibility of soils- immediate and time bound. Time rate analysis of consolidation and magnitude of compression, Mechanical compaction. (b) Skills • Identifies the general engineering behavior of soil knowing some basic soil properties. • Able to categorize soil into particular group knowing gradation and plasticity characteristics of soil. • Calculate effective stresses in soil mass on which engineering behavior of soil depends. • Capable of identifying the flow path of water particle through soil medium and quantify flow of water through soil. • Able to quantify the magnitude of consolidation and work out its time dependency. • Able to design and carry out field compaction of soil by mechanical means. Course Description/Course • History and development of Geotechnical Engineering. Contents • Geotechnical engineering problems in Civil & Urban Engineering. • Three phase system of soil, physical and index properties. • Unified soil classification, AASHTO soil classification and field identification of soils.
2. 2. • Effective stress concept and Capillarity in soils. • Permeability of soils and flow through soils, flow nets for confined and unconfined flow. Infiltration – rate, extent, equilibrium. • Consolidation of soils. Terzaghi’s one dimensional consolidation theory, time rate of consolidation and magnitude of consolidation. Laboratory test for determining consolidation characteristics. • Mechanical compaction. Methods of compaction. Pre-requisites CEng 2411 (Hydraulics I) Semester 4 Status of Course Compulsory Teaching & Learning Methods - lectures, Laboratory, assignments Assessment/Evaluation & - Assignment, laboratory and Mid Exam 50% Grading System - Final Examination 50% Attendance Requirements - Minimum of 80% during lectures & 100% during laboratory sessions Literature Budhu M. (2000), Soil Mechanics and Foundations, Wiley and Sons. Lambe, T. W., Whitman, R. V. (1999), Soil Mechanics, John Wiley & Sons Inc COURSE OUT LINE Unit ONE Introduction and soil formation Objective: To be able to identify the necessity of study of soil mechanics for civil engineers. Topics: Introduction to soil mechanics, the study & role of soil mechanics, some typical problems, historical development of soil mechanics, soil failures. (1 week) Unit TWO Soil formation Objective: To be able to identify the processes behind formation of various soil deposits. Topics: Rocks, the sources of soil, rock forming minerals, types of rocks, structural geology, rock weathering, soil formation, transport and deposition. (1 ½ weeks) Unit THREE Physical and Index properties Objective: To be able to identify various terms and properties related to soil and their inter relationship. To be able to identify grain size distribution and it’s bearing on soil behaviour. Topics: Soil composition, three phase model of soil, basic definitions, weight / mass – volume relationships, void ratio, porosity, water content, Degree of saturation, sp. gravity of soil solids, In-situ density, relative density. Examples. Soil texture, grain size distribution, Soil moisture, Atterberg limits/ consistency indices, specific surface, and clay mineralogy. (3 weeks)
3. 3. Unit FOUR Soil classification Objective: To be able to identify soil types in lab and field and thereby its behaviour. Topics: General, systems of soil classification, the unified soil classification system (USCS), HRB classification system (AASHTO), field identification tests. (1 ½ weeks) Unit FIVE Hydraulic properties of soil Objective: To be able to identify permeability of soil, co efficient of permeability for homogeneous and layered soils, calculate seepage quantity & construction of flow net. Topics: Water in soil, permeability, one dimensional flow, permeability of layered soils, capillarity, seepage forces and quick conditions, seepage flow through soil, two dimensional flow, Laplace equation. Flow nets for sheet pile cut off walls and earth dams. Flow net construction, computation of seepage quantity, filters in dams, sudden draw down and seepage forces, piping and its control. (3 weeks) Unit SIX Effective stress concept Objective: To identify the difference among total, effective and neutral stresses. Topics: Geo-static stresses, Total, effective and neutral stresses, capillary rise in soils. (1 week) Unit SEVEN Compressibility and consolidation of soils Objective: To identify the phenomenon of consolidation of soil. To be able to calculate pre consolidation pressure, primary and secondary consolidation settlement, rate of consolidation and be able determine MDD & OMC for different soils. To be able to control field compaction. Topics: Soil consolidation, Odometer test, Interpreting consolidation test, correction of compression curve, preconsolidation and estimation of pre consolidation pressure. The compression parameters, soil structure and consolidation. Computation of primary consolidation settlement and secondary consolidation settlement. Controlling consolidation settlements, the co efficient of consolidation, percentage of consolidation, Rate of consolidation. Soil compaction and compaction theory, standard and modified compaction test. Field compaction and its control. (3 weeks) EVALUATION: Assignment and quiz………………………… 08 % Laboratory……………………………………. 12 % Mid. Examination……………………………… 35 % Final Examination……………………………… 45 %
4. 4. REFERENCES: a. Geotechnical engineering – principles and practices by Donald P. Cuduto b. Essentials of soil mechanics and foundations by David F. Mc Carthy c. Basic and Applied Soil Mechanics by Gopalranjan and ASR Rao d. Soils & Foundations by Cheng Liu & Jack B. Evett e. Geotechnical engineering by Renato Lancellotta f. Geotechnical Engineering by Gulati and Datta g. Craig’s Soil Mechanics by Craig h. Soil Mechanics and Foundation Engineering by V.N.S.Murty i. Soil Mechanics and Foundation Engineering by S.K. Garg j. Soil Mechanics and Foundation Engineering by Arora k. Soil mechanics by M.J.Smith l. Experimental soil mechanics by Cheng Liu & Jack B. Evett m. Soil Mechanics by Powrie