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Notice on Academic Report by Dr.Andrew McNamara of City University of London

Editor: 系统管理员 Date: 2016-11-28 Hits: 52

TitleBehaviour of Ribbed Piles in Clay

SpeakerAndrew McNamara

Time23rd, Nov., 2016, 1400-1500

VenueA326 Anzhong Building

 

Introduction

Dr. Andrew McNamara is a senior lecturer at City University of London. He has over 35 years of experience as a practicing engineer and 15 years as an academic. He completed his PhD at 2001 on the effect of heave reducing piles on ground movements around excavations. He leads the Multiscale Geotechnical Engineering Research Centre at City University of London where his research focus on physical modelling of deep foundations and deep excavations. He is currently chair of ISSMGE technical committee TC104 for Physical Modelling and also director of the Temporary Works for Centre of Excellence in Temporary Works and Construction Method Engineering based at City University of London. In industry, he is chief engineer for Skanska Building (London and South East) where he has involvement with projects ranging from the £1.5bn Battersea Power Station Phase 2 and 52 Lime Street (the Scalpel) to many smaller projects in London valued at about £30m. Previous major projects have included landmark buildings in London such as the complex Moorhouse shaft for Crossrail, 30 St Mary Axe (the Gherkin) and Heron Tower.

Presentation Abstract

Piling contractors are always keen to consider methods for reducing costs as the industry is very competitive. Most contractors in UK have considered the use of ribbed bored cast in situ piles as it is accepted that such a foundation could provide much more capacity than a standard straight shafted pile. In addition, a high capacity ribbed pile could provide significant environmental benefits compared with a standard pile as the materials used are potentially much less given that values of adhesion routinely adopted in stiff clays assuming that only about 60% of the undrained shear strength of the soil is mobilized. A series of centrifuge model tests have been undertaken to establish optimum rib configurations for piles in clay. The most advantageous rib profile for construction is a helical pattern as this is probably easiest to construct quickly. The results of tests on plain piles, concentric ribbed piles and helically ribbed piles are explored.

 

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