ANALYSIS OF THE CONTRIBUTION OF THE BLOCK-SOIL CONTACT IN PILED FOUNDATIONS

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JEAN RODRIGO GARCIA
PAULO JOSÉ ROCHA DE ALBUQUERQUE, Dr.

Abstract

GEOTECHNICAL ENGINEERING HAS OFTEN BEEN CHALLENGED BY DEMANDS FROM TECHNICALLY AND ECONOMICALLY BOLD CONSTRUCTION PROJECTS, SUCH AS THAT OF TALL BUILDINGS. THE ARCHITECTURAL REQUIREMENTS OF THESE BUILDINGS HAVE INCREASED AND CONCENTRATED THE LOADS FROM STRUCTURAL SYSTEMS WITHOUT PROPORTIONALLY INCREASING PLANT AREA. NEW FORMS OF USING LOAD CAPACITY AND SETTLEMENT CONTROL HAVE BEEN ASSESSED TO OPTIMIZE CONVENTIONAL DESIGNS. THUS, PILED FOUNDATIONS STARTED TO ALLOW FOR THE CONTRIBUTION OF BLOCK–SOIL CONTACT, BEING CONCEPTUALLY NAMED PILED RAFT. IN THIS SENSE, THIS STUDY ANALYZED THE CONTRIBUTION OF CONTACT IN PILED FOUNDATIONS COMPOSED OF ONE, TWO, THREE AND FOUR INSTRUMENTED BORE PILES 25 CM IN DIAMETER ( ) AND 5 M IN LENGTH (L). EXPERIMENTAL RESULTS SHOWED A 21% AVERAGE CONTRIBUTION OF BLOCK–SOIL IN RELATION TO THE TOTAL PILED FOUNDATION CAPACITY. THIS RESULT DEMONSTRATES THE NEED TO RE-EVALUATE TRADITIONAL CALCULATION REQUIREMENTS, AIMING AT RATIONALIZING THE GEOTECHNICAL DESIGN AND IMPROVING THE OVERALL SAFETY/STABILITY OF THE SYSTEM.

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JEAN RODRIGO GARCIA, Universidade Federal de Uberlândia, Programa de Pós-Graduação em Engenharia Civil, Uberlândia, MG, Brasil

graduated from Civil Engineering at the Engineering School of Ilha Solteira FEIS/Unesp (2003), got his Master Degree (2006) and Doctorate (2015) in Civil Engineering from the State University of Campinas (UNICAMP). He is currently a Civil Engineering Professor at the Federal University of Uberlândia (UFU) and a Collaborating Researcher at UNICAMP. He operates in the area of analysis of geotechnical structures, containment and excavation works, foundations and earthworks, soil investigation tests and numerical analyses of geotechnical problems via finite elements. Member of technical commissions of foundations (CTF) and of field investigation (CTIC), and also a member of the Brazilian Association of Soil Mechanics and Geotechnical Engineering (ABMS)

PAULO JOSÉ ROCHA DE ALBUQUERQUE, Dr., Universidade Estadual de Campinas, Programa de Pós-Graduação em Engenharia Civil, Campinas, SP, Brasil

received the BSc. in Civil Engineering in 1993, MSc. in Engineering in 1996, PhD. in Soil and Foundation Engineering in 2001 and postdoctoral in 2010 at the Polytechnic University of Catalonia in Barcelona/Spain. He has been an Associate Professor at University of Campinas since 2001, teaching and researching, with emphasis in in-Situ tests, laboratory tests and foundations. He was the secretary of the Technical Commission of In-Situ Tests of the Brazilian Association of Soil Mechanics (ABMS) between 2007 and 2010 and the president for the Biennium 2011/2012. He is the secretary of the Technical Commission of Foundation of the Brazilian Association of Soil Mechanics for the Biennium 2013-2016. In biennia 2013-2016 he will act as Vice-President of the Regional Center of São Paulo (ABMS). Since 2015 he has been a Brazilian representative of ABMS on TC102 Technical Commission of Foundations of ISSMGE.