Download or read book Negative Skin Friction Induced on Piles in Collapsible Soils Due to Inundation written by Sarah Tahsin Noor Kakoli and published by . This book was released on 2011 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: Collapsible soils experience significant volume decrease due to the increase of soil moisture content, with or without an increase in the in-situ stress level. These soils form large parts of North and South America, Eastern Europe, China, Central Asia, Northern and Southern Africa, Russia, Egyptian western dessert, and the continuous deposit from North China to South-East England. As human activities continue to increase in these regions, geotechnical engineers must learn how to deal with these problematic soils. Foundations on collapsible soils suffer from sudden settlement, which may contribute to serious damage or catastrophic failure due to inundation. For relatively light structures, the use of shallow foundations combined with soil replacement or treatment may constitute economical designs. For heavy structures, pile is perhaps the best of alternative available types of foundation. This subject of significant practical interest has received little attention from the researchers mainly due to the complexity in conducting experimental study. Furthermore, numerical modeling is difficult at best due to the complexity associated in describing the behavior of collapsible soil during inundation. Analytical modeling is not suitable in this respect, as soil grains in collapsible soil undergo radical rearrangements during inundation. In the literature, no design theory can be found to predict the negative skin friction on pile foundation due to inundation of collapsible soil. Present study presents a numerical model, which is capable to incorporate the effect of inundation of collapsible soil on an axially loaded vertical pile. It employs the theories of unsaturated soil mechanics; including the Soil-Water Characteristic Curve (SWCC) to include the effect of soil suction reduction resulted from the progressive inundation, from two different aspects: change in soil properties, and irrecoverable soil volume change. The proposed numerical model is used to predict negative skin friction exerted on the pile during inundation of collapsible soil surrounding the pile. The numerical model is validated by comparing the numerical results and the experimental data from the literature. Moreover, another numerical modeling procedure is also proposed to design the pile (i.e., length and diameter) in collapsible soil, provided that the indirect load due to negative skin friction is known. An extensive numerical investigation is carried out to identify the parameters (e.g., collapse potential, radius of wetting, pile roughness, etc.) influencing the negative skin friction acting on a pile during inundation. Based on the numerical results, analytical models that can be directly used to predict the indirect load due to negative skin friction are established for both directions (i.e., from bottom and top) of inundation. Design procedures that can provide adequate positive skin friction and pile capacity in accommodating indirect load due to negative skin friction, are proposed to design the length and diameter of a single pile in collapsible soil subjected to inundation. Present study is useful in reductions in the costs of construction, litigation and remediation in geotechnical engineering practice.

Download or read book Experimental Study on Negative Skin Friction on Piles in Collapsible Soils Due to Inundation written by Ibrahim Mashhour and published by . This book was released on 2016 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Collapsible soil is a special type of soil, classified as problematic soil. It possesses a high strength in the unsaturated phase and loses its strength and exhibits substantial settlement when inundated. Many foundation failures occur around the world, many of which involve loss of lives, caused by problems associated with collapsible soils. One of the most commonly used type of foundation in collapsible soils is end-bearing piles resting on firm soil strata. However, these piles will be subjected to negative skin friction during wetting of the collapsible soil, inducing additional loads. Various case studies have reported foundation failures and excessive settlements upon the wetting of collapsible soil. Researchers are facing serious challenges in dealing with piles in collapsible soils due to the complexity of the problem and the difficulties associated with modeling this behaviour numerically and experimentally. Relatively few investigations pertinent to pile foundations in collapsible soils subjected to inundation are available in the literature. An experimental investigation was carried out to simulate the complex interaction between collapsible soil and a single end-bearing pile under various wetting and loading conditions. The experimental prototype setup was developed and calibrated in the laboratory in order to measure the drag load and accordingly the negative skin friction acting on the pile’s shaft for given soil/wetting/loading conditions. Collapsible soils with different collapse potential values were created in the laboratory by mixing kaolin clay with fine sand at predetermined ratios. A two-dimensional axi-symmetrical numerical model was generated in order to conduct a parametric study by extending the data for a wider range. The numerical model was validated by experimental results obtained from this study. Based on the results obtained from the experimental and numerical models, a design theory capable of taking into account the effect of soil collapse under different wetting schemed was developed and recommended for use in practice.

Download or read book Negative Skin Friction on Single Piles in Collapsible Soil written by Ibrahim Mashhour and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Collapsible soil is known as problematic soil, which possesses considerable strength when it is dry and loses its strength and experience excessive settlement when inundated. Geotechnical engineers face a great challenge when they build on/in collapsible soil. Inundation of collapsible soil may take place due to surface running water or raising the groundwater level. In case of surface water, the amount of settlement varies, depending on the extent of the wetting zone and the degree of saturation in the soil. The case of rising groundwater will produce full saturation in the ground and accordingly, the maximum settlement of the foundations. In the literature, there is lack of sufficient and reliable methods for predicting drag force on piles embedded in collapsible soils. These difficulties stem from the fact modeling collapsible soil analytically is difficult at best, while collapsible soil is governed by the collapse potential of the soil and method of inundation. In this thesis, the results of an experimental investigation on a single end-bearing pile embedded in collapsible soil will be presented. The objective of this experimental investigation was to measure the soil collapse and the associated settlement and accordingly the negative skin friction on the pile's shaft for a given soil and pile conditions due to soil inundation. Empirical formula is presented to estimate the negative skin friction on these piles for a given soil/pile condition.

Download or read book Negative Skin Friction on Piles written by Richard Paul Long and published by . This book was released on 1974 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Negative Skin Friction of Bearing Piles written by Mohamed Aly Elmasry and published by . This book was released on 1963 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Negative Skin Friction on Piles written by Ronald Lee Bajuniemi and published by . This book was released on 1973 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Negative Skin Friction on Single Piles in Clay Subjected to Direct and Indirect Loading written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Full scale Testing of Blast induced Liquefaction Downdrag on Driven Piles in Sand written by Luke Ian Kevan and published by . This book was released on 2017 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deep foundations such as driven piles are often used to bypass liquefiable layers of soil and bear on more competent strata. When liquefaction occurs, the skin friction around the deep foundation goes to zero in the liquefiable layer. As the pore pressures dissipate, the soil settles. As the soil settles, negative skin friction develops owing to the downward movement of the soil surrounding the pile. To investigate the magnitude of the skin friction along the shaft three driven piles, an H-pile, a closed end pipe pile, and a concrete square pile, were instrumented and used to measure soil induced load at a site near Turrell, Arkansas following blast-induced liquefaction. Measurements were made of the load in the pile, the settlement of the ground and the settlement of piles in each case. Estimates of side friction and end-bearing resistance were obtained from Pile Driving Analyzer (PDA) measurements during driving and embedded O-cell type testing.

Download or read book Coupled Consolidation Model for Negative Skin Friction on Piles in Clay Layers written by Mohammad Azizul Hoque and published by . This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Piles driven in clay are often subjected to indirect loading as a result of the surcharge applied on the surrounding area. During the drained period, both the pile and the soil undergo downward movements caused by the axial and the surcharge loading, respectively. Depending on the relative movement of the pile/soil system, positive and negative skin friction develop on the pile's shaft. Negative skin friction is the drag force that may be large enough to reduce the pile capacity and/or to overstress the pile's material causing fractures or perhaps structural failure or possibly pulling out the pile from the cap. A numerical model was developed to simulate the case of a single pile driven in soft clay layer overlying a deep deposit. Coupled consolidation method of analysis is adopted to predict time/settlement/skin friction distribution relationships. The model is an axisymmetric that uses the finite element technique combined with the soil responses according to Mohr-Coulomb criteria. The model was first tested against the results predicted by the classic theories for bearing capacity of pile foundations on clay. Furthermore, the model was validated with the results of three full scale field tests available in the literature.

Download or read book Negative Skin Friction on Long Piles Driven in Clay written by Bengt H. Fellenius and published by . This book was released on 1971 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Downdrag of Piles by Negative Skin Friction for Commonwealth of Massachusetts Department of Public Works written by Massachusetts Institute of Technology and published by . This book was released on 1971 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Foundation Engineering written by Ralph B. Peck and published by John Wiley & Sons. This book was released on 1991-01-16 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covers properties of subsurface materials, types of foundations and methods of construction, selection of foundation type and basis for design, and design of foundations and earth-retaining structures.

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 Principles of Foundation Engineering written by Braja M. Das and published by PWS Publishing Company. This book was released on 1990 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt: Very Good,No Highlights or Markup,all pages are intact.

Download or read book Geotechnical Instrumentation for Monitoring Field Performance written by John Dunnicliff and published by John Wiley & Sons. This book was released on 1993-10-06 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first book on the subject written by a practitioner forpractitioners. Geotechnical Instrumentation for Monitoring FieldPerformance Geotechnical Instrumentation for Monitoring FieldPerformance goes far beyond a mere summary of the technicalliterature and manufacturers’ brochures: it guides readersthrough the entire geotechnical instrumentation process, showingthem when to monitor safety and performance, and how to do it well.This comprehensive guide: * Describes the critical steps of planning monitoring programsusing geotechnical instrumentation, including what benefits can beachieved and how construction specifications should bewritten * Describes and evaluates monitoring methods and recommendsinstruments for monitoring groundwater pressure, deformations,total stress in soil, stress change in rock, temperature, and loadand strain in structural members * Offers detailed practical guidelines on instrument calibrations,installation and maintenance, and on the collection, processing,and interpretation of instrumentation data * Describes the role of geotechnical instrumentation during theconstruction and operation phases of civil engineering projects,including braced excavations, embankments on soft ground,embankment dams, excavated and natural slopes, undergroundexcavations, driving piles, and drilled shafts * Provides guidelines throughout the book on the best practices

Download or read book Geotechnical Engineer s Portable Handbook written by Robert Day and published by McGraw Hill Professional. This book was released on 1999-12-02 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt: One-volume library of instant geotechnical and foundation data Now for the first time ever, geotechnical, foundation, and civil engineers...geologists...architects, planners, and construction managers can quickly find information they must refer to every working day, in one compact source. Edited by Robert W. Day, the time -and effort-saving Geotechnical Engineer's Portable Handbook gives you field exploration guidelines and lab procedures. You'll find soil and rock classification, basic phase relationships, and all the tables and charts you need for stress distribution, pavement, and pipeline design. You also get abundant information on all types of geotechnical analyses, including settlement, bearing capacity, expansive soil, slope stability - plus coverage of retaining walls and building foundations. Other construction-related topics covered include grading, instrumentation, excavation, underpinning, groundwater control and more.

Download or read book Principles and Practice of Ground Improvement written by Jie Han and published by John Wiley & Sons. This book was released on 2015-06-22 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gain a stronger foundation with optimal ground improvement Before you break ground on a new structure, you need to analyze the structure of the ground. Expert analysis and optimization of the geo-materials on your site can mean the difference between a lasting structure and a school in a sinkhole. Sometimes problematic geology is expected because of the location, but other times it's only unearthed once construction has begun. You need to be able to quickly adapt your project plan to include an improvement to unfavorable ground before the project can safely continue. Principles and Practice of Ground Improvement is the only comprehensive, up-to-date compendium of solutions to this critical aspect of civil engineering. Dr. Jie Han, registered Professional Engineer and preeminent voice in geotechnical engineering, is the ultimate guide to the methods and best practices of ground improvement. Han walks you through various ground improvement solutions and provides theoretical and practical advice for determining which technique fits each situation. Follow examples to find solutions to complex problems Complete homework problems to tackle issues that present themselves in the field Study design procedures for each technique to simplify field implementation Brush up on modern ground improvement technologies to keep abreast of all available options Principles and Practice of Ground Improvement can be used as a textbook, and includes Powerpoint slides for instructors. It's also a handy field reference for contractors and installers who actually implement plans. There are many ground improvement solutions out there, but there is no single right answer to every situation. Principles and Practice of Ground Improvement will give you the information you need to analyze the problem, then design and implement the best possible solution.