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Soil Critical State Theories

Soil Critical State Theories

Code	9764
Year	1
Semester	S1
ECTS Credits	6
Workload	OT(15H)
Scientific area	Geotechnics
Entry requirements	Student of the 3rd cycle of studies leading to a doctoral degree in Civil Engineering
Mode of delivery	Face to face by tutoring including e- and b-learning
Work placements	Not applicable
Learning outcomes	This is a modern approach to soil mechanics, and our purpose in this course is to convey a fundamental understanding of mechanical behaviour of soil. The treatment is intended to be simple and essentially no mathematical, and we develop our ideas of soil behaviour by observing the response of clay and sand soils to loading in laboratory test. We believe that our approach to soil behaviour through the theories of critical sate soil mechanics not only provides a simples and logical method of teaching the subject, but also forms the basis of rational design methods. In appropriate points we draw the familiar ideas of the Mohr-Coulomb strength and Terzaghi consolidation theories. 1 – Mastery in engineering of soil and its behavior - states of stress and strain; 2 - Mastery in stress-strain paths and invariants; 3 – Mastery in overconsolidated samples behavior – Hvorslev surface; 4 – Mastery in mechanical behavior of soils before failure; 5 – Understanding the critical state and the Roscoe surface 6 – Mastery in laboratory tests in soils.
Syllabus	1 - Engineering of soil and its behavior – Stresses and strains in soils (physical relationships for soils; the significance of effective stress; increments of stress and strain); 2 - Stress-strain paths and invariants (stress paths; invariants of stress; strain paths; volumetric strains); 3 - Critical state line and the Roscoe surface (drained and undrained tests and planes; the Roscoe surface and the shape; state boundary surface); 4 - Behavior of overconsolidated samples – Hvorslev surface (drained tests; Hvorslev surface; complete state boundary surface); 5 - Behavior of soils before failure (elastic and plastic deformations; calculations of elastic strains; plasticity for soils; Cam-clay) 6 - Laboratory tests on soils (tests for soil classification, triaxial apparatus; oedometer, direct shear box; simple shear apparatus).
Main Bibliography	- Atkinson, J.H.; Bransby, P.L. (1978). “The Mechanics of Soils-An introduction to the critical state soil mechanics”. McGraw-Hill Book Company (UK) Limited. ISBN 0-07-084077-6. - Copper, P.L.; Cassie, W.F., Geddes, J.P. (1980). “Problems in engineering soils.” 3th edt, E & F.N. Spon,London. - Das, Braja M. (1987). “Advanced Soil Mechanics.” (edt) Mcgraw-Hill, ISBN: 0-07-Y66237-1. - Das, Braja M. (2006). “Principles of geotechnical engineering”. 6th edition, Thomson Learning Ltda. ISBN 0-534- 55144-0. - Frank, R.; Bauduin; C., Driscoll,R.; Kavvadas M.; Krebs Ovesen, N.; Orr, T.; Schuppener, B. (2004). Designers´guide to EN 1997-I Eurocode 7: Geotechnical Design-General Rules. Series editor H. Gulvanessian, Published by Thomas Telford Publishing, ISBN. 0 7277 31548. - Lambe, T.W., Whitman, R.V. (1979). “Soil Mechanics, SI version”. (edt) J. Wiley, ISBN: 0-471-80792-3 - Matos Fernandes, M (2006). Mecânica dos Solos - Vol. I e Vol. II - (FEUP), ISBN. 972-752-086-3 - National and international journals/proceedings indexed.
Language	Portuguese. Tutorial support is available in English.