Author: Scott A. Ashford
Publisher:
ISBN:
Category : Materials
Languages : en
Pages : 286

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Author: Thomas Jay Weaver
Publisher:
ISBN:
Category :
Languages : en
Pages : 506

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Author: Scott A. Ashford
Publisher:
ISBN:
Category : Piling (Civil engineering)
Languages : en
Pages : 568

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This report presents the results of the Treasure Island Liquefaction Test (TILT), a joint project carried out by the University of California, San Diego, and Brigham Young University. To improve our understanding of the lateral load behavior of deep foundations in liquefied soil, a series of full-scale lateral load tests were performed at the National Geotechnical Experimentation Site (NGES) at Treasure Island in San Francisco, California. The ultimate goal of the TILT project was to develop lateral load-displacement relationships for a variety of individual piles and pile groups in liquefied sand under full-scale conditions. The tests were carried out using a high-speed hydraulic loading system after the sand surrounding the piles was liquefied using blasting techniques. This report presents backcalculated p-y curves for single pipe piles, pile groups, and cast-in-steel shell piles before and during liquefaction, as well as through dissipation of excess pore water pressures. In addition, recommendations with regard to design of deep foundations in liquefied soil are presented.

Author: Ross W. Boulanger
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 344

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Proceedings of a workshop on Seismic Performance and Simulation of Pile Foundations in Liquefied and Laterally Spreading Ground, held in Davis, California, March 16-18, 2005. Sponsored by the Pacific Earthquake Engineering Research Center; University of California at Berkeley; Center for Urban Earthquake Engineering; Tokyo Institute of Technology; Geo-Institute of ASCE. This collection contains 25 papers that discuss physical measurements and observations from earthquake case histories, field tests in blast-liquefied ground, dynamic centrifuge model studies, and large-scale shaking table studies. Papers contain recent findings on fundamental soil-pile interaction mechanisms, numerical analysis methods, and reviews and evaluations of existing and emerging design methodologies. This proceeding provides comprehensive coverage of a major issue in earthquake engineering practice and hazard mitigation efforts.

Author: Murad Abu-Farsakh
Publisher: Springer
ISBN: 3319616420
Category : Science
Languages : en
Pages : 314

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Book Description
This volume on “Advances in Analysis and Design of Deep Foundations” contains 22 technical papers which cover various aspects of analysis and design of deep foundations based on full-scale field testing, numerical modeling, and analytical solutions. The technical papers are 8-10 pages long that present the results and findings from research as well as practical-oriented studies on deep foundations that are of interest to civil/geotechnical engineering community. The topics cover a wide spectrum of applications that include evaluation of the axial and lateral capacity of piles, pile group effects, evaluation of the increase in pile capacity with time (or pile setup), influence of excavation on pile capacity, study the behavior of pile raft caisson foundations, evaluate the bearing capacity and settlement of piles from cone penetration tests, etc. This volume is part of the proceedings of the 1st GeoMEast International Congress and Exhibition on Sustainable Civil Infrastructures, Egypt 2017.

Author: Raymond Lundgren
Publisher: ASTM International
ISBN: 9780803102910
Category : Electronic book
Languages : en
Pages : 621

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Author: Osman Amr El Menchawi
Publisher:
ISBN:
Category :
Languages : en
Pages : 650

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Author: Michael W. O'Neill
Publisher:
ISBN:
Category : Foundations
Languages : en
Pages :

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Author: Elvis Ishimwe
Publisher:
ISBN:
Category : Foundations
Languages : en
Pages : 440

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Deep foundation elements are typically used to transfer structural loads for multi-story buildings and large-span bridges to a competent soil layer when 1) the soil close to the ground surface has no sufficient bearing capacity, and when 2) liquefiable soils are encountered. The majority of the bridges constructed within seismic zones rely upon the stability of earthen embankments and deep foundation that are installed above or within liquefiable soil deposits. Despite large factor of safety values or different load and resistance factors being used to adequately design deep foundations within seismic areas, soil liquefaction may cause extensive damage to the structure by 1) reducing the axial geotechnical resistances, 2) reducing the lateral load capacity, 3) adding additional loads to the foundation (dragload), 4) inducing excessive foundation settlements (downdrag), and 5) causing lateral spreading on the soil surrounding the foundation. The compressive movement of the soil caused by liquefaction affects the distribution of the load along a deep foundation. Dragloads are developed when the amount of the soil settlement is larger than the amount of foundation settlement. According to Muhunthan et al. (2017), the developed dragload may exceed the structural axial strength of the deep foundation in the extreme events. This additional load can significantly impact the axial behavior of a deep foundation. In addition, the liquefaction-induced settlements may affect serviceability of the structure by causing downdrag on the installed deep foundation element. Many of the existing design methods to address dragload and downdrag are based on the consolidation phenomenon. Therefore, there is an immediate need for research to evaluate the impact of liquefaction-induced dragload and dragload on the performance of deep foundation elements constructed in earthquake prone areas. Full-scale axial load tests and full-scale blast-induced liquefaction tests were performed around three drilled shaft foundations and three driven pile foundations to 1) evaluate the existing design methods, and 2) investigate the effects of liquefaction-induced dragload and downdrag on deep foundations. The tested foundations were constructed at the Turrell Arkansas Test Site (TATS), located within the New Madrid Seismic Zone (NMSZ), and Mississippi Embayment.

Author: Ronald Y. S. Pak
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 224

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Book Description
GSP 107 contains 13 papers on soil dynamics and liquefaction presented at sessions of Geo-Denver 2000, held in Denver, Colorado, August 5-8, 2000.