48
Geotechnics
REGGIO DI CALABRIA
Overview
Date/time interval
Syllabus
Course Objectives
The course aims at providing a fundamental understanding of soil behavior subjected to dynamic/cyclic loading to evaluate the response of natural soils and artificial slopes under seismic loading and the effects of mechanical properties of soils on seismic response of structures, infrastructures and in general on engineering structures.
In particular, the course will provide knowledge on: l) stress-strain behavior of soils under cyclic loadings; II) dynamic characterization and modeling of soils by in-situ and laboratory investigation; III) ground response analysis and local site effects according to Italian Building Code, IV) soil liquefaction V) slope stability analysis under seismic loadings; VI) seismic risk and microzonation
Course Prerequisites
Basic knowledge of soil mechanics and geotechnical engineering is required.
Teaching Methods
The course on Soil Dynamics /Soil Dynamics and Earthquake Geotechnical Engineering is divided into: a) lessons on all the topics of the course with an active interaction with the students; b) Exercises and practical applications related to relevant problems in seismic geotechnical engineering even by using computer programs
Assessment Methods
The exam consists of an oral exam aimed at verifying the acquired knowledge and application skills. The objective of the oral exam will be to verify the learning ability, the level of knowledge, of understanding of the contents of the course as well as to evaluate the communication skills. The ability to apply knowledge in the context of real application problems will be verified through the exercises delivered by the student.
The final grade in 30-point scale will be assigned on the basis of the following elements:
-30 - 30 cum laude”: complete, in-depth and critical knowledge of the topics, excellent language skills, complete and original interpretative ability, full ability to autonomously apply knowledge to solve the proposed problems;
-“26 – 29”: complete and in-depth knowledge of the topics, high language skills, complete and effective interpretative ability, capability to autonomously apply knowledge to solve the proposed problems;
-“24 – 25”: knowledge of the topics with a good level of learning, good language skills, correct and confident interpretative ability, ability to correctly apply most of the knowledge to solve the proposed problems;
-“21 – 23”: adequate knowledge of the topics, but lack of mastery of the same, satisfactory language skills, correct interpretative ability, limited ability to autonomously apply the knowledge to solve the proposed problems;
-“18 – 20”: basic knowledge of the main topics, basic knowledge of technical language, sufficient interpretative ability, ability to apply the basic knowledge acquired;
-“Insufficient”: does not have acceptable knowledge of the topics covered during the course.
Texts
• Course materials prepared by the teacher
• Geotechnical Earthquake Engineering. Kramer S. L. Prentice Hall Inc., New Jersey, 1996.
• Dinamica dei terreni per le applicazioni sismiche. Crespellani T. e Facciorusso J. D. Flaccovio Editore, 2010.
• Input Sismico e Stabilità Geotecnica dei Siti di Costruzione. Lai C.G., Foti S., Rotta M. Collana di Manuali di Progettazione Antisismica, Vol. 6, 2009, IUSS Press.
• Risposta Sismica Locale: Teoria Ed Esperienze. Lanzo G., Silvestri F. Argomenti di ingegneria Geotecnica, Hevelius, Benevento, 1998.
• Misure Dinamiche In Sito. Mancuso C. Hevelius, Benevento, 1996.
NTC 18– Updating of the Technical Standards of the Construction–D.M. 17 January 2018 and “e CIRCOLARE 21 Gennaio 2019, N. 7 C.S.LL.PP.”.
Contents
The course on Soil Dynamics deals with the following topics :
INTRODUCTION to Geotechnical Earthquake Engineering. 1. SEISMOLOGY AND EARTHQUAKES. GROUND MOTION PARAMETERS. WAVE PROPAGATION. 2. STRESS-STRAIN BEHAVIOUR OF CYCLICALLY LOADED SOILS. Strain thresholds in soil dynamics. Strength of cyclically loaded granular and cohesive soils: experimental evidences and laboratory simulation. 3. MODELING OF SOIL DYNAMIC BEHAVIOUR. Linear visco-elastic models, equivalent linear models, cyclic non linear models. Derivation of model parameters. 4. MEASUREMENT OF DYNAMIC SOIL PROPERTIES. Field tests. Seismic cross-hole and down-hole tests, spectral analysis of surface wave test (SASW): experimental procedures and interpretation of test results. Standard penetration test. Cone penetration test. Laboratory cyclic and dynamic tests (the students will be present at the performance of dynamic and cyclic tests at the geotechnical didactic laboratory);: Bender Elements, cyclic triaxial and simple shear tests, resonant column and torsional shear tests. Test procedure and results. Factors affecting dynamic properties of sands and clays. 5. SITE EFFECTS AND LOCAL SEISMIC RESPONSE. Site effects in earthquake ground motions. Key factors governing seismic response of a soil. Specific analysis for seismic response evaluation. Local seismic response predictions and Italian seismic code. 6. LIQUEFACTION OF GRANULAR SOILS. Liquefaction occurrence: theoretical aspects and influencing factors. Liquefaction surface evidences at site: case histories. Evaluation of liquefaction hazard according to Italian Building Code. Seismic risk and soil improvement for liquefaction mitigation purposes. Evaluation of post-seismic settlements by simplified procedures.
The contents concerning Earthquake Engineering are:
7. SEISMIC RESPONSE ANALYSIS BY NUMERICAL CODES : theoretical modeling through numerical codes based on both non linear and equivalent linear site response; application to a case study. Relevance of earthquake induced excess pore water pressure development.8. SLOPE STABILITY ANALYSES UNDER EARTHQUAKE LOADING: design verifications by pseudo-static and displacements methods; application to a case study.9. SEISMIC RISK AND OVERVIEW INTO ZONATION AND MICROZONATION: purpose, levels of analysis and description to a case study.