Download or read book Effects of Stress History of Sand on the Shaft Resistance of Large Displacement Piles written by Fabrizio Di Camillo and published by . This book was released on 2014 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation on the coefficient of earth pressure of overconsolidated cohesionless soil developed around displacement piles was conducted. An instrumented prototype set-up and model pile was developed in the laboratory. The set-up was capable of measuring the total load, the shaft resistance acting on the pile and the overconsolidation ratio in the sand mass. Overconsolidated sand was prepared by placing the sand in the testing tank in layers, each subjected to a predetermined compaction effort. The stresses in the sand mass were measured by means of pressure transducer units placed in selected locations in the testing tank. The model piles were driven into the sand mass to a selected depth. Pile load tests were conducted at a constant rate of penetration at different depths. The pile capacity was determined from load-displacement curves. The shaft resistance and, hence, the coefficient of earth pressure around the pile were determined. The results showed that the coefficient of earth pressure is heavily dependent on the stress history of the sand mass. A theoretical model was developed to incorporate the effects of overconsolidation of the sand on the shaft resistance of driven piles in cohesionless soils.

Download or read book Uplift Resistance of Pile Shaft in Sand written by Abdullah I. Al-Mhaidib and published by . This book was released on 1992 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Insitu Stresses and Capacity of Driven Piles in Sand written by Mohab Sabry and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pile foundations are used extensively around the world to support both inland and offshore structures, including important structures such as nuclear plants and oil drilling platforms. Pile foundations are known to resist higher compression and uplift loading as compared to shallow foundations. The common factor in resisting the compression and the tensile loading is the friction, which takes place between the pile and the soil. Pile foundations can be categorized as bored and driven piles. Bored piles installed in sand are known to provide relatively low capacity as compared to driven piles under the same condition. This is due the effect of the pile driving process. The estimation of the shaft resistance of driven piles remains empirical at best. The changes in the in situ stress levels as a result of pile installation are quite often overestimated/underestimated leading to unsafe/uneconomic design of the foundations. The objective of this study is to examine the changes in the in situ stresses during the pile driving process, and accordingly to predict the pile capacity. In order to achieve these objectives, numerical model is developed to simulate the process of pile installation and link the cavity expansion to the pile installation and pile diameter. During this research program the changes in the soil mass due to pile installation will be recorded. Furthermore, the changes of the OCR around the pile will be examined and its effects on the earth pressure acting on the pile's shaft will be evaluated. Based on the results of the present investigation, design theory is proposed to account for the effect of pile diameter during installation in dry sand. In order to achieve these objectives, a numerical model utilizing the finite element method of analysis combined with the theory of cavity expansion is developed. This model is capable of predicting the magnitude and the distribution of the coefficient earth pressure acting on the pile's shaft and accordingly the overconsolidation ratio. Based on the result obtained from the numerical model, an analytical model was developed to incorporate the findings observed from the numerical model. The analytical model will be then presented in the form of design procedure and design charts for practical use. The theories developed herein compared well with the available laboratory and field experimental data.

Download or read book Frontiers in Offshore Geotechnics written by Susan Gourvenec and published by CRC Press. This book was released on 2005-10-13 with total page 1130 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present work contains 150 papers that were presented during ISEC-03, the 3rd International Conference on Structural and Construction Engineering, that was held in Tokuyama College of Technology, Shunan, Japan, from September 20 to 23, 2005. The theme of the conference was Collaboration and Harmony of Creative Systems. The conference was to encourage and assist the collaboration of any and all kinds of structural, system, and construction engineering using information technology in an environmentally friendly manner. This book contains these challenging papers.

Download or read book Case History Evaluation of Axial Behavior of Augered cast in place Piles and Pressure injected Footings written by Jie-Ru Chen and published by . This book was released on 1998 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ICP Design Methods for Driven Piles in Sands and Clays written by Richard Jardine and published by Thomas Telford Limited. This book was released on 2005 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Broadening the recommendations published by Jardine and Chow in 1996, this volume provides procedures that can be applied by geotechnical engineers, supported by worked examples for sands and clays. It also offers guidance on application to a range of pile types, geotechnical profiles and loading conditions.

Download or read book Experimental Study of Ultimate Uplift Resistance of Roughened Model Piles in Sand written by Ahmed Shlash and published by . This book was released on 1994 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Application of Stress wave Theory to Piles written by Jaime Alberto dos Santos and published by IOS Press. This book was released on 2008 with total page 772 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This volume contains 101 papers presented at the 8th International Conference on the Application of Stress Wave Theory to Piles, held in Lisbon, Portugal in 2008." "It is divided in 14 chapters according to the conference themes: Wave mechanics applied to pile engineering; Relationship between static resistance to driving and long-term static soil resistance; Case histories involving measurementand analysis of stress waves; Dynamic monitoring of driven piles; Dynamic soil-pile interaction models - numerical and physical modeling; High-strain dynamic test; Low-strain dynamic test; Rapid-load test; Monitoring and analysis of vibratory driven piles; Correlation of dynamic and static load tests; Quality assurance of deep foundations using dynamic methods; Incorporation of dynamic testing into design codes and testing standards; Ground vibrations induced by pile motions; Dynamic measurements in ground field testing." "This conference aims to contribute to a better and more efficient professional interaction between specialized contractors, designers and academicians. By joining the contribution of all of them it was possible to elucidate the today's state-of-the-art in science, technology and practice in the application of stress wave theory to piles."--BOOK JACKET.

Download or read book Investigation of the End Bearing Performance of Displacement Piles in Sand written by Xiangtao Xu and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: [Truncated abstract] The axial performance of piles in sand remains an area of great uncertainty in geotechnical engineering. Over the years, database studies have shown that the existing method for offshore piles (e.g. API 2000) is unreliable. There is therefore a clear need for an improved predictive method, which incorporates the state-ofthe- art understanding of the underlying controlling mechanisms. This Thesis is dedicated to address the factors influencing the end bearing performance of displacement piles in siliceous sand with a view to proposing and justifying an improved design formulation. Firstly, a database of displacement pile load tests in sand with CPT data was compiled in collaboration with James Schneider (Schneider 2007). It features the widest database with also the latest available pile load test data (e.g. Euripides, Ras Tanajib, Drammen etc) in electronic form. Evaluation of the three new CPTbased methods (Fugro-05, ICP-05 & NGI-05) against this database has revealed a broadly similar predictive performance despite their end bearing formulations being remarkably different. This anomaly promoted the author to extend the database to include additional tests with base capacity measurements to form new base capacity databases for driven and jacked piles, which resulted in the UWA- 05 method for end bearing of displacement piles in sand. This method accounts for the pile effective area ratio, differentiates between driven and jacked piles, and employs a rational qc averaging technique. ... Field tests were performed in Shenton Park, Perth to supplement the database study and, in particular, to examine the effect of the incremental filling ratio (IFR). 10 open-ended and 2 closed-ended piles were tested in compression followed by tension. The test results provide strong support for the UWA-05 method for base capacity evaluation employing the CPT qc values and the effective area ratio. A series of jacked pile tests was carried out on the UWA beam centrifuge, to further explore the factors affecting pile base response. In total, four uniform and four layered centrifuge samples were prepared and tested at various stress levels and relative densities using three separate pile diameters. The resistance ratio (qb0.1/qc,avg) is found to be independent of the absolute pile diameter, effective stress and soil relative density. The tests in layered soil enabled quantification of the reduction in penetration resistance when a pile/cone approaches a weak layer and revealed the significant influence on base stiffness of underlying soft clay layers. The stiffness decay curves (G/GIN vs. w/D, where GIN is initial operational shear stiffness) measured in static load tests were found to vary with ratios of GIN/qc, while there was a unique relationship between G/GIN and qb/qc. A detailed parametric study was carried out (using the FE code PLAXIS) by idealising pile penetration using a spherical cavity expansion analogue in layered soil. The numerical predictions compare well with the centrifuge results and their generalization enabled guidelines to be established for end bearing in layered soil.

Download or read book Frontiers in Offshore Geotechnics III written by Vaughan Meyer and published by CRC Press. This book was released on 2015-05-15 with total page 1422 pages. Available in PDF, EPUB and Kindle. Book excerpt: Frontiers in Offshore Geotechnics III comprises the contributions presented at the Third International Symposium on Frontiers in Offshore Geotechnics (ISFOG, Oslo, Norway, 10-12 June 2015), organised by the Norwegian Geotechnical Institute (NGI). The papers address current and emerging geotechnical engineering challenges facing those working in off

Download or read book Proceedings of the First Southern African Geotechnical Conference written by S.W. Jacobsz and published by CRC Press. This book was released on 2016-03-30 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: The First Southern African Geotechnical Conference was organised by the Geotechnical Division of the South African Institution of Civil Engineering (SAICE) under the auspices of the International Society of Soil Mechanics and Geotechnical Engineering (ISSMGE) and took place at Sun City, South Africa on 5 and 6 May 2016. More than 60 papers were rec

Download or read book Basics of Foundation Design written by Bengt Fellenius and published by Lulu.com. This book was released on 2017-03-17 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: The "Red Book" presents a background to conventional foundation analysis and design. The text is not intended to replace the much more comprehensive 'standard' textbooks, but rather to support and augment these in a few important areas, supplying methods applicable to practical cases handled daily by practising engineers and providing the basic soil mechanics background to those methods. It concentrates on the static design for stationary foundation conditions. Although the topic is far from exhaustively treated, it does intend to present most of the basic material needed for a practising engineer involved in routine geotechnical design, as well as provide the tools for an engineering student to approach and solve common geotechnical design problems.

Download or read book The Material Point Method for Geotechnical Engineering written by James Fern and published by CRC Press. This book was released on 2019-01-30 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: This practical guide provides the best introduction to large deformation material point method (MPM) simulations for geotechnical engineering. It provides the basic theory, discusses the different numerical features used in large deformation simulations, and presents a number of applications -- providing references, examples and guidance when using MPM for practical applications. MPM covers problems in static and dynamic situations within a common framework. It also opens new frontiers in geotechnical modelling and numerical analysis. It represents a powerful tool for exploring large deformation behaviours of soils, structures and fluids, and their interactions, such as internal and external erosion, and post-liquefaction analysis; for instance the post-failure liquid-like behaviours of landslides, penetration problems such as CPT and pile installation, and scouring problems related to underwater pipelines. In the recent years, MPM has developed enough for its practical use in industry, apart from the increasing interest in the academic world.

Download or read book Pile Design and Construction Practice written by Willis H. Thomas and published by CRC Press. This book was released on 2007-12-06 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt: This international handbook is essential for geotechnical engineers and engineering geologists responsible for designing and constructing piled foundations. It explains general principles and practice and details current types of pile, piling equipment and methods. It includes calculations of the resistance of piles to compressive loads, pile group

Download or read book Cone Penetration Testing 2018 written by Michael A. Hicks and published by CRC Press. This book was released on 2018-06-13 with total page 757 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cone Penetration Testing 2018 contains the proceedings of the 4th International Symposium on Cone Penetration Testing (CPT’18, Delft, The Netherlands, 21-22 June 2018), and presents the latest developments relating to the use of cone penetration testing in geotechnical engineering. It focuses on the solution of geotechnical challenges using the cone penetration test (CPT), CPT add-on measurements and companion in-situ penetration tools (such as full flow and free fall penetrometers), with an emphasis on practical experience and application of research findings. The peer-reviewed papers have been authored by academics, researchers and practitioners from many countries worldwide and cover numerous important aspects, ranging from the development of innovative theoretical and numerical methods of interpretation, to real field applications. This is an Open Access ebook, and can be found on www.taylorfrancis.com.

Download or read book Analysis and Prediction of the Axial Capacity and Settlement of Displacement Piles in Sandy Soil written by Feng Mu and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Analysis and Prediction of the Axial Capacity and Settlement of Displacement Piles in Sandy Soil" by Feng, Mu, 牟峰, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: ABSTRACT Piles are often used as foundations for tall buildings and critical structures. The performance of displacement piles in sand is recognized as being the area of greatest uncertainty in foundation design. Until recently, design methods throughout the world were almost entirely empirical. The failure to fully understand the underlying mechanisms is due mainly to the complexity of the interaction between the pile and surrounding soil. This thesis describes an investigation into the behavior of displacement piles in sandy soil and proposes a novel approach for the analysis and prediction of both the capacity and settlement of displacement piles under axial load. The estimation of ultimate base resistance is implemented in the framework of spherical cavity expansion theory by taking into account the properties of sandy soils, in terms of nonlinear shear stiffness and state-dependent shear strength. The ultimate local shaft friction is estimated based on a careful investigation of the 'friction fatigue' along the pile shaft during pile installation. Three phases of the load-settlement response are identified according to the mobilization of base and shaft resistances, and thereafter estimates are made in terms of the individual contributions of the base and shaft resistances to the total head settlement in each phase. A database of high-quality pile load tests is compiled for purposes of validating the proposed approach. A reasonably good agreement is shown between the measurements and predictions in both capacity and settlement. To facilitate the practical application, further effort has been made to develop a user-friendly software in the Windows platform that incorporates this novel approach. ii DOI: 10.5353/th_b3955898 Subjects: Piling (Civil engineering) Soil mechanics

Download or read book Shaft Resistance of Driven Piles in Overconsolidated Cohesionless Soils written by Yasir Mohammed Alharthi and published by . This book was released on 2018 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Piles are structural members that transfer the applied load of superstructures to deep supportive layers of soil or bedrock. Besides controlling the settlement of structures, piles provide sufficient capacity that other foundations cannot provide or provide only at a high cost. Despite ample research on the shaft resistance of displacement piles in cohesionless soils, the mechanism of such resistance remains unclear. Consequently, theories on shaft resistance have generated several discrepancies in predicting the capacity of displacement piles in cohesionless soils, not only due to the complexity of modeling cohesionless materials and collecting field data but also because the role of overconsolidation in such soils, which is often neglected. Although the critical depth of pile foundation in cohesionless soils has long been debated, definite conclusions have yet to be drawn. Overconsolidation in cohesionless soils directly affects the lateral earth pressure that acts upon the pile shafts and thus upon pile capacity. Overconsolidation can occur naturally or artificially when the ground surface is subjected to erosion, excavation, or unloading, often due to glacial melting, the demolition of structures, raised water tables, compaction, or vibration. This thesis presents an experimental investigation into the capacity of driven piles in overconsolidated cohesionless soils. Tests, with an emphasis on the shaft resistance and the critical depth, were conducted on long piles in a setup that permits measuring the overconsolidation ratio in the test tank as well as the total and local shaft resistance on the pile's shaft. Shear stress distribution along the pile's shaft showed some dependency on embedment depth ratio (L / D). Also, critical depth was observed for shaft resistance only when mean shaft resistance was analyzed, and was in line with Meyerhof's (1976) results. An analytical model was also developed based on limit equilibrium analysis using the horizontal slice method to predict the shaft resistance of a pile driven into normally consolidated cohesionless soils. The model assumes an inclined failure surface around the pile that accounts for the shear and normal stresses upon it. Critical depth was not only observed but also increased linearly as the angle of shearing resistance increased. A three-dimensional numerical model was developed and validated experimentally to perform 200 pile load tests in soils with various densities and at a range of embedment depths. Design theories to predict the shaft resistance of displacement piles in cohesionless soils and the critical depth were developed, design charts are presented.