Download or read book Improving Design Phase Evaluations for High Pile Rebound Sites Final Report written by and published by . This book was released on 2016 with total page 459 pages. Available in PDF, EPUB and Kindle. Book excerpt: A testing program performed to help determine typical soils properties encountered during pile installation when high rebound occurs produced a decision matrix for geotechnical engineers. High pile rebound (HPR) occurred at numerous sites in Florida. Samples from standard penetration test (SPT) borings and thin-walled tube sample borings were used in addition to cone penetrometer with pore pressure (CPTu) data to determine soil properties trends.

Download or read book Design Phase Identification of High Pile Rebound Soils written by Paul J. Cosentino and published by . This book was released on 2010 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research was to determine geotechnical testing protocol that would help engineers anticipate high rebound. The literature review revealed high pile rebound sites throughout North America. This problem typically occurred when displacement piles were driven into medium dense or stiff saturated silts and clays, using single acting hammers. An extensive laboratory and field testing program was conducted at three existing FDOT project sites. Two were located in the Orlando area and the third in the Florida Panhandle. The field testing included Standard Penetration Borings with N-values; Pocket Penetrometer unconfined compressive tests; Cone Penetrometer soundings that produced point bearing; sleeve friction and pore water pressures; PENCEL Pressuremeter tests that produced in situ stress-strain data; and Dilatometer soundings to produce lift-off pressures and elastic moduli.

Download or read book Evaluating Geotechnical Engineering Properties Associated with High Pile Rebound written by Fauzi H. M. Jarushi and published by . This book was released on 2013 with total page 1078 pages. Available in PDF, EPUB and Kindle. Book excerpt: At certain depths during driving of large diameter displacement piles, rebound greater than 0.25 inches occurs, followed by a small permanent-set after each hammer blow. This phenomenon is called high pile rebound (HPR). HPR soils may stop the pile driving and result in a limited pile capacity. The overburden depth at which HPR occurs is typically greater than 50 ft. In some cases, rebound leads to pile damage, delaying of the construction project and foundations redesign. The objective of this research was to develop a geotechnical engineering protocol that would allow the geotechnical engineer to identify soil properties and strata which might cause HPR before pile driving begins (i.e., during the design phase of the project). A total of 172 test piles at 138 pier locations, including 102 large prestressed concrete piles (PCP) and 70 low displacement steel H-Piles, were evaluated so as to select the HPR sites where geotechnical data could be collected. Based on available geotechnical data, 21 PCP piles at eleven sites were chosen for this investigation. The H-piles did not experience any HPR problems and thus were not studied. All HPR piles were driven into saturated, fine silty to clayey sands and sandy clays or fat clays. A complete subsurface investigation was conducted after all HPR piles were installed. It included Standard Penetration Testing (SPT), retrieval of disturbed samples, lab testing to produce basic geotechnical index properties, plus Cone Penetrometer Testing (CPT) with pore water pressure measurements. A total of 43 SPT test borings and 27 CPT soundings were performed and evaluated. Pile Driving Analyzer (PDA) data from all the test piles was reduced to a deflection versus time to enable both the maximum and final displacements per blow to be used in calculating rebound. Maximum displacement and inspector set (iSet), recorded during installation of the test piles, was used to develop several promising correlations between pile rebound, or inspector set and SPT blow counts (NSPT), fines content, and CPT. In soil conditions where the NSPT values were 15 blows/ft or less with a fines content of 25 percent (i.e., analyses include 21 piles at eleven sites), the rebound was less then 0.25 inches and yielded an acceptable pile permanent-iSet of up to 3 inches. When the NSPT values were between 15 and 40 blows/ft with a fines content of 25 to 40 percent, the pile rebound varied between 0.25 and 0.6 inches but still produced an acceptable permanent-iSet. As the NSPT exceeded 40 blows/ft with a fines content greater than 40 percent, the pile rebound was greater than 0.6 inch accompanied by a small or zero (i.e., unacceptable) permanent i-Set. Where piles experienced excessive HPR with zero or minimal permanent-iSet at 8 piles, the CPTu pore water pressure (u2) yielded very high positive values of more than 20 tsf. However, at the two sites (i.e., 4 piles) where the pile rebounded, and was followed by an acceptable permanent-iSet, the measured CPTu u2 ranged between 5 and 20 tsf, the u2 exhibited values of less than 5 tsf at two piles where no rebound detected. Direct linear correlations between CPTu u2 and rebound were produced with strong linear correlations with regression coefficients R2 of 0.6 or higher. In these cases, the permanent-iSet decreased and rebound increased as u2 increased. Rebound versus u2 or u2/hydrostatic pressure (u0) pressure produced a linear plot through the origin, indicating rebound would equal approximately 2.5% of the CPTu u2 or 5.5% of the u2/u0. Therefore, these correlations between CPTu pore pressure and rebound allow identification of soils that produce HPR. In order to improve the knowledge about the soil types producing HPR, Piezocone data at HPR sites were interpreted using CPT and CPTu soil behavior type (SBT) charts developed by 1) Schmertmann (1978), 2) Eslami and Fellenius (2004), 3) Robertson (1990), and 4) Schneider et al. (2008). SBT charts allow geotechnical engineers to fully utilize the behavior of HPR soils. HPR soils are classified as dense or stiff by Schmertmann (1978); and categorized as silty sand or silty clay to clay silt by the Eslami-Fellenius (2004) chart, where [CPT sleeve friction] is greater then 0.80 tsf and [CPT Cone resistance] is greater than 200 tsf. The Robertson (1990) SBT chart showed that most HPR soils were in zone 4 (i.e., clayey silty to silty clay), with a [pore pressure] ratio of greater than 0.4 and a friction ratio of greater than 1.5%. Most non-HPR soils on these charts were in zone 6 (clean sand to silty sand). The most promising chart was developed by Schneider et al. (2008), and classified HPR layers as 1a and 1b (silt and clays) with [excess pore pressure] of greater than 1, while non-HPR soils were plotted in transitional soils, zone 3 (sand), with [excess pore pressure] of less than 1. Comparison of these results with classifications from laboratory tests were in excellent agreement with CPT soil type, and therefore the CPT can be a useful tool in evaluation of HPR soils. Statistical analyses were performed on the geotechnical data using SPSS software (Statistical Package for Social Sciences). Equations and a nomograph to predict pile rebound were developed which then were investigated for the adequacy of fit. An analysis of variance (ANOVA) was conducted to determine if there was any significant relationship between rebound, NSPT and fines content or friction ratio and CPTu pore pressure. The applicability of equations and the nomograph was evaluated by plotting the predicted rebound versus actual rebound. The actual rebound data was from sites which were not used to develop the equations and the nomograph. The performance of both the equation and the design chart produced R2 values of 0.70 or higher. Statistical logistic regression modeling was also carried out on the geotechnical data using SPSS software. As a result, the models showed that the probabilities of HPR increased as either the fines content or NSPT increased and the regression coefficient R2 approached 1.0. The probability of the HPR was greater than 50 percent when the NSPT exceeded 30 blows/ft and the fines content exceeded 35 percent. The probability of HPR using CPTu pore pressure was greater than 50 percent when the pore pressure was greater than 16 tsf. The relationship between HPR and CPTu pore pressure produced a strong correlation coefficient of R2 approaching 1.0. The statistical logistic regression modeling and equations showed promise in predicting rebound. This methodology may lead to a simpler evaluation process which allows engineers to predict HPR during the design phase. A variety of methods were shown to be effective in predicting HPR and the correlations developed in this study allow the geotechnical engineer to predict if HPR will occur at a proposed site, where high displacement piles are to be driven using a single-acting diesel hammer. The correlations showed that permanent-iSet and rebound were a direct function of NSPT and fines content or friction ratio R[f] and pore pressure u2 of the soil at the pile tip. The design equations and corresponding nomograph developed provide a methodology that allows for the prediction of HPR during the design phase.

Download or read book Engineering Properties of Pile Rebound Soils Based on Cone Penetration Testing written by Hadeel Dekhn and published by . This book was released on 2015 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: High pile rebound (HPR) has been identified by Florida Department of Transportation (FDOT) to occur during the installation of square prestressed concrete piles at many sites in Florida. Significant pile rebound values of up to 1.5 inch/blow were measured resulting in increased blow counts. Pile refusal is a common occurrence when blow count exceeds 240 blow/ft; leading to pile redesign and economic consequences. The overall objective of this research is to identify the engineering properties of soil deposits which may cause HPR and develop improved correlations that may be used to predict HPR during the design process. Seven sites were studied in this research. Pile driving analyzer (PDA) data was used to identify the rebound zones. Cone penetration tests (CPT) and Standard penetration tests (SPT) were conducted near the associated test piles. The SPT data was used to develop soil profile for each site. The CPT data was used to estimate profiles of engineering soil properties. An existing correlation between the CPT pore pressure and pile rebound was evaluated and improved. High CPT pore pressures measured at the rebound zones were found to correlate linearly with pile rebound. Using the CPT the rebound soils were classified as dense silty sands and highly overconsolidated or cemented silty clays. These soils are dilative under shear loading increasing the shear strength of the surrounding soil and the pile skin friction. As a result higher blow counts are required to reach pile penetration. The HPR soils have very low permeability; therefore, high compression-induced pore pressures may be generated near the pile tip during driving. These pore pressures at the pile tip may provide upward forces leading to rebound. The SPT data showed that cemented silty fine sand (SM) and clayey fine sand (SC) with trace phosphate and shell with fines content of 25 % to 40 % were found in the rebound zones. The CPT data superimposed on soil behavior type (SBT) charts provides an engineering method to predict pile rebound soils.

Download or read book Pile Foundations in Engineering Practice written by Shamsher Prakash and published by John Wiley & Sons. This book was released on 1991-01-16 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a concise, systematic and complete treatment of the design and construction of pile foundations. Discusses pile behavior under various loadings and types of piles and their installation, including consideration of soil parameters. It provides step-by-step design procedures for piles subject to vertical loading and pullout, lateral, inclined and eccentric loads, or dynamic loads, and for piles in permafrost. Also describes load test procedures and their interpretation and buckling of long, slender piles with and without supported length. The closing chapter presents case histories of prediction and performance of piles and pile groups. Includes numerous solved problems.

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 Government Reports Announcements Index written by and published by . This book was released on 1991 with total page 822 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Architectural Graphic Standards written by American Institute of Architects and published by John Wiley & Sons. This book was released on 2017-03-16 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt: ARCHITECTURAL GRAPHIC STANDARDS THE LANDMARK UPDATE OF THE MOST RECOGNIZED STUDENT RESOURCE IN ARCHITECTURE The Student Edition of the iconic Architectural Graphic Standards has been a rite of passage for architecture, building, and engineering students for more than eighty years. Thoughtfully distilled from the Twelfth Edition of Architectural Graphic Standards and reorganized to meet the specific needs of today’s students, this fully updated Student Edition shows you how to take a design idea through the entire planning and documentation process. This potent resource stays with you through your academic experience and into your first years as a professional with thousands of useful illustrations and hundreds of architectural elements conveniently placed at your fingertips. Presented in a format closely resembling an architect’s actual workflow, this Twelfth Edition student handbook features: Completely new material on resiliency in buildings A versatile treatment written for the design studio setting and aligned with the most current curricular trends, including new and updated coverage on topics related to sustainability, digital fabrication, and building information modeling (BIM) A proven pedagogy that saves students time and ensures young professionals avoid the most common pitfalls Develop a state-of-the-art mastery of design best practices with Architectural Graphic Standards, Twelfth Edition, Student Edition.

Download or read book Architectural Graphic Standards written by The American Institute of Architects and published by John Wiley & Sons. This book was released on 2007-03-30 with total page 1120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since 1932, the ten editions of Architectural Graphic Standards have been referred to as the "architect's bible." From site excavation to structures to roofs, this book is the first place to look when an architect is confronted with a question about building design. With more than 8,000 architectural illustrations, including both reference drawings and constructible architectural details, this book provides an easily accessible graphic reference for highly visual professionals. To celebrate seventy-five years as the cornerstone of an industry, this commemorative Eleventh Edition is the most thorough and significant revision of Architectural Graphic Standards in a generation. Substantially revised to be even more relevant to today's design professionals, it features: An entirely new, innovative look and design created by Bruce Mau Design that includes a modern page layout, bold second color, and new typeface Better organized-- a completely new organization structure applies the UniFormat(r) classification system which organizes content by function rather than product or material Expanded and updated coverage of inclusive, universal, and accessible design strategies Environmentally-sensitive and sustainable design is presented and woven throughout including green materials, LEEDS standards, and recyclability A bold, contemporary new package--as impressive closed as it is open, the Eleventh Edition features a beveled metal plate set in a sleek, black cloth cover Ribbon Markers included as a convenient and helpful way to mark favorite and well used spots in the book All New material Thoroughly reviewed and edited by hundreds of building science experts and experienced architects, all new details and content including: new structural technologies, building systems, and materials emphasis on sustainable construction, green materials, LEED standards, and recyclability expanded and updated coverage on inclusive, universal, and accessible design strategies computing technologies including Building Information Modeling (BIM) and CAD/CAM new information on regional and international variations accessibility requirements keyed throughout the text new standards for conducting, disseminating, and applying architectural research New and improved details With some 8,500 architectural illustrations, including both reference drawings and constructible architectural details, Architectural Graphic Standards continues to be the industry's leading, easily accessible graphic reference for highly visual professionals.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1971 with total page 1330 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design of Pile Foundations written by Aleksandar Sedmak Vesić and published by Transportation Research Board. This book was released on 1977-01-01 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NCHRP Report 507 written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rock Foundations written by United States. Army. Corps of Engineers and published by . This book was released on 1994 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Engineering and Design written by Us Army Corps Of Engineers and published by Military Bookshop. This book was released on 2002-06-01 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: This manual provides practical guidance for the design and operation of soil vapor extraction (SVE) and bioventing (BV) systems. It is intended for use by engineers, geologists, hydrogeologists, and soil scientists, chemists, project managers, and others who possess a technical education and some design experience but only the broadest familiarity with SVE or BV systems.

Download or read book Precast concrete piles written by FIB – International Federation for Structural Concrete and published by FIB - International Federation for Structural Concrete. This book was released on 1986-01-01 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: This technical report covers all aspects of the uses of precast concrete piles - design, manufacture, transport, handling, pitching and driving. Both reinforced and prestressed concrete piles are dealt with and attention is paid to the use of both plan piles and those with enlarged toes. Although the report is a translation of parts of a set of three volumes prodduced in the Netherlands, those parts reproduced are internationally applicable. Special sections deal with the effects of pile driving on adjacent buildings and theor occupants - both as regards vibration and noise.

Download or read book Permeable Barriers for Groundwater Remediation written by Arun R. Gavaskar and published by . This book was released on 1998 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Because of the limitations of conventional pump-and-treat systems in treating groundwater contaminants, permeable barriers are potentially more cost-effective than pump-and-treat systems for treating dissolved chlorinated solvent plumes, which may persist in the saturated zone for several decades. Other contaminants, such as chromium or other soluble heavy metals, can also be treated with this technology. Permeable Barriers for Groundwater Remediation discusses the types of permeable barriers, their design and construction, and how they can be monitored to evaluate compliance. It provides practical guidance on reactive media selection, treatability testing, hydrogeologic and geochemical modeling, and innovative installation techniques for the evaluation and application of this promising new technology. The types of permeable barriers discussed include: trench-type and caisson-based reactive cells; innovative emplacements, such as horizontal trenching and jetting; and continuous reactive barriers versus funnel-and-gate systems.

Download or read book Load and Resistance Factor Design LRFD for Deep Foundations written by Samuel G. Paikowsky and published by Transportation Research Board. This book was released on 2004 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction and research approach -- Findings -- Interpretation, appraisal, and applications -- Conclusions and suggested research -- Bibliography -- Appendixes.