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  • DFI
    Non-Destructive Testing Of Drilled Shafts and CFA Piles – Current Practice and New Method

    By George Piscsalko

    "Quality control of drilled shafts and CFA piles is greatly dependent upon the practices of the site personnel. In many applications it is difficult or not possible to fully inspect the shaft prior to

    Jan 1, 2014

  • DFI
    Case History Of The Support Of Excavation System At The Dulles Automated People Mover (DAPM) Tunnels And Stations

    By Marlion T. McQuinn

    This paper will discuss the design, construction, and performance of the support of excavation on the Dulles East and West Automated People Mover Tunnels and Station projects. The elements of the sys

    Jan 1, 2006

  • DFI
    Deep Excavation Retaining Systems In Unsaturated Soils

    By Tariq B. Hamid

    Deep excavation is commonly associated with construction of different deep below-grade structural elements (e.g., basement walls and slabs, tunnels, retaining walls, tanks, utilities, etc.) Deep Excav

    Jan 1, 2006

  • DFI
    Modulus of Elasticity in Deep Bored Piles

    By Carlos Lam, Joram M. Amir, Erez I. Amir

    "Abstract The modulus of elasticity of pile material (E) is an important parameter for the interpretation of both static and dynamic loading tests on piles. This value is commonly assumed to be consta

    Jan 1, 2014

  • DFI
    Experiences Of The Cast-In-Situ Pile Filling In Stone-Line Intercalation

    By Guan Jichang

    An abandened breakwater, located at the rear of No. 2 berth in Dongdu Port area of Xiamen City, was not cleaned thoroughly when the backfilling of sand started. The uncleaned stone layer was about 2 t

    Jan 1, 1991

  • DFI
    Supported Excavation Movement Causing Lateral Displacement and Cracks in Drilled Shafts - Lessons Learned from a Case Study in Chicago

    By Eric R. Borys, Amaneh E. Kenarsari, Brett Gitskin

    This case study discusses impacts of excessive Earth Retention System (ERS) lateral movement at a project in city of Chicago. The ERS (cantilevered sheeting) moved inward towards the excavation and ca

    Jan 1, 2018

  • DFI
    United States Capitol Visitor Center - Drilled Shafts, Utility Conflicts, And Communication

    By Giovanni A. Bonita

    The United States Capitol Visitor Center (USCVC) is one of the largest underground structures ever constructed in the Washington, DC, metropolitan area. The 600,000 ft2 (55,750 m2) structure is entir

    Jan 1, 2006

  • DFI
    Optimising the Compressive Behavior of Screw Piles in Sand for Marine Renewable Energy Applications

    By Andrew J. Brennan, Jonathan A. Knappett, Lewis Hamilton, Michael J. Brown

    "Abstract This paper investigates the compressive behaviour of screw piles in sands and the key design parameters which control this. These types of foundation elements have typically been used as scr

    Jan 1, 2014

  • DFI
    Offshore Wind Turbine Foundations - In Denmark And Belgium - Introduction

    By Jørn H. Thomsen

    This paper presents the experience gained and the lessons learned over the last decade within the numerous offshore foundation projects undertaken in the offshore waters of Denmark and Belgium by COWI

    Jan 1, 2013

  • DFI
    Development of a New, Advanced form of Sodium Silicate for Chemical Grouting

    By Julie Shang, Tim Evans, Michael McDonald, Yu Guo, Bingfeng Xue

    Effective chemical grouting represents a technical and economic solution to many challenges related to soil stabilization and blocking the flow of water. Chemical grouts are facing increasing demands

    Jan 1, 2018

  • DFI
    Helical Piles With Grouted Shafts - A Practical Overview

    By Gary L. Seider

    Helical screw piles are used in various applications including the underpinning of distressed foundations and as deep foundations for new structures. At present, maximum design loads range between 12.

    Jan 1, 2003

  • DFI
    Installation Parameters, Pile Performance and Importance of Testing

    By Maurice Bottiau

    "Abstract When addressing the performance of deep foundations, many parameters play a role, from adequate soil investigation to performance monitoring and testing. The correct understanding of pile co

    Jan 1, 2014

  • DFI
    High-Capacity Rock Anchors Provide Uplift Resistance For Concrete-Filled Steel Pipe Piles - A Case Study

    By James Weaver

    During the past 16 years, the authors have successfully used high-capacity rock anchors installed inside open-ended pipe piles, driven to bedrock, to provide uplift and overturning resistance for vari

    Jan 1, 2011

  • DFI
    Underpinning A Crane Foundation

    By Donald R. McMahon

    This paper presents a unique case history that documents the use of a braced secant pile wall to underpin a heavily loaded footing inside of a manufacturing plant. Construction of a pit for a new man

    Jan 1, 2006

  • DFI
    Use Of Controlled Modulus Columns In Retail & Industrial Development Projects

    By Frederic Masse

    With widespread acceptance in the market place, many engineers are choosing ground improvement techniques to provide suitable foundation subgrade at sites that would have traditionally required deep f

    Jan 1, 2011

  • DFI
    Soil Profiles Along The Alignment Of The I-880 Replacement Project

    By Mark A. Willian

    The purpose of this short paper is to present soil profiles and basic soils information for the portion of the I-880 Replacement Project alignment where highway structures are to be built. The informa

    Jan 1, 1996

  • DFI
    Analysis Of Strain-Dependent Concrete Modulus From Mass Instrumented Test Pile Samples

    By Lee Sieng Kai

    This paper presents the result of the analysis of strain-dependent concrete modulus from full-scale static axial compression load tests conducted on more than 200 instrumented cast-in-place barrettes

    Jan 1, 2006

  • DFI
    "Underpinning By Jet Grouting" - Summary

    By George K. Burke

    Underpinning of a structure has been traditionally expensive, time consuming, and, in many cases, caused as much settlement to the existing structure as it was trying to prevent. As underpinning is no

    Jan 1, 1991

  • DFI
    Non-Destructive Testing Methods For Drilled Shaft And Acip Piles

    By George Piscsalko

    There are numerous methods currently available to assess the integrity of drilled shaft and ACIP piles. Each method has its advantages and limitations. This paper will compare the various available me

    Jan 1, 2011

  • DFI
    The Pile Foundation Of Tall Buildings In Shenzhen

    By Li Keqiang

    This paper discusses the pile foundation of tall buildings in Shenzhen region. For 156 constructed tall buildings exceeding 18 storeys, about 86. 5 per cent of the sum. The two main types of foundatio

    Jan 1, 1991