Download or read book Highway Applications for Rammed Aggregate Piers in Iowa Soils written by and published by . This book was released on 2003 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes a study to evaluate Geopier (registered trademark) soil reinforcement technology in transportation construction. Three projects requiring settlement control were chosen for evaluation--an embankment foundation, a box culvert, and a bridge approach fill. For each project, construction observations, in situ soil testing, laboratory material characterization, and performance monitoring were carried out.
Download or read book Rammed Aggregate Pier Soil Reinforcement written by Kenneth Keith Hoevelkamp and published by . This book was released on 2002 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: In lieu of bridge replacement, the construction of a 4.2 m wide x 3.6 m high box culvert and subsequent embankment beneath a bridge on Iowa Highway 191 south of Neola, Iowa, necessitated the reinforcement of soft soils encountered at the site. Rammed aggregate piers (Geopier[Superscript Tm] foundation elements) were installed in an effort to reduce total and differential settlement while ensuring the stability of the existing bridge piers whose depth was not known. Challenges to construction included a groundwater table at the working surface, very soft soil conditions, and low clearance for machinery beneath the bridge. Benefits of the culvert embankment include ease of future roadway expansion and continual service of the highway throughout construction. Site investigation consisted of an extensive in-situ testing program including piezocone penetrometer (CPT), pressuremeter (PMT), dilatometer (DMT) and borehole shear (BST). Results were used to characterize the subsurface soil engineering properties, and to define the depth of the alluvial clay layer. Laboratory testing, consisting of consolidated drained triaxial (CD), unconsolidated undrained triaxial (UU), oedometer and Atterberg limit tests, were conducted to define strength and consolidation parameters and soil index properties for classification. Vibrating wire instrumentation including settlement cells, stress cells and piezometers were installed for continuous monitoring during and after box culvert construction and fill placement. In addition, settlement pins were installed in the culvert and monitored by conventional optical survey techniques. Data gathered from subsurface investigations were used to estimate total settlement and rate of settlement within the alluvial clay layer. Estimates were contrasted with values obtained from field performance monitoring. Load testing of individual and groups of piers was carried out at the site for purposes of investigating group interaction behavior.
Download or read book Geotechnical Engineering for Transportation Projects written by American Society of Civil Engineers. Geo-Institute and published by . This book was released on 2004 with total page 1266 pages. Available in PDF, EPUB and Kindle. Book excerpt: GSP 126 contains 223 papers presented at Geo-Trans 2004, held in Los Angeles, California, July 27-31, 2004.
Download or read book Annual Report of Highway Division Highway Research and Development in Iowa for the Fiscal Year Ending June 30 written by and published by . This book was released on 2000 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Support Mechanism of Rammed Aggregate Piers written by Ha Thuc Van Pham and published by . This book was released on 2005 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation is a compilation of four papers submitted to scholarly geotechnical engineering journals. Each paper includes references to literature reviewed, research data, and significant findings. The first paper presents an experimental study performed to investigate the influence of induced lateral stress on shear strength, vertical stiffness, and preconsolidation pressure of the reconstituted Iowa loess. Four series of stress path control tests were conducted in which soil specimens remolded from western Iowa loess, were consolidated under increased lateral stress before being loaded vertically in either drained or undrained fashion. The second paper describes a numerical analysis using an axisymmetric, finite element model to study the behavior of isolated rammed aggregate piers subjected to compressive load. The load transfer mechanism along pier shaft and pier-soil interactions is particularly investigated in this paper. Constitutive parameters of the materials involved in the numerical analysis were determined from in-situ and laboratory tests. The finite element model was validated by comparing the numerical results with the data obtained from full-scale, instrumented load tests. The third paper presents results from full-scale, instrumented load tests conducted on two trial square pier-supported footings and three isolated rammed aggregate piers. Group effects are investigated by comparing the behavior of an individual pier within the pier group and an isolated pier from the same diameter and length. Evaluation of the current design methods for computing bearing capacity of pier-supported footing is carried out by comparing the calculated parameters with the measured values. The fourth paper presents a numerical study on the support mechanism of rammed aggregate pier groups. The numerical study focuses on the group behavior of rammed aggregate piers and the vertical stress distribution underneath the footings. A modulus-based method developed based on the homogenization approach combined with the finite element stress distribution for estimating footing settlement is also presented in this paper.
Download or read book Annual Report of Project Development Division Highway Research and Development in Iowa for the Fiscal Year Ending June 30 written by and published by . This book was released on 1993 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Modelling of Construction Processes in Geotechnical Engineering for Urban Environment written by Theodoros Triantafyllidis and published by CRC Press. This book was released on 2006-02-23 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: These are the Proceedings of the International Converence on Numerical Modelling of Construction Processses in Geotechnical Engineering for the Urban Environment, Bochum Germany, March 2006.
Download or read book Evaluation of Geopier Rammed Aggregate Piers by Geopier Foundation Company written by and published by . This book was released on 2007-01-01 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transportation Research Record written by and published by . This book was released on 1974 with total page 842 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design and Construction of Rammed Aggregate Pier in Soil Improvement written by Hamed Niroumand and published by . This book was released on 2012-02-11 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stone columns have been used since the 1950's as a technique for soil improvement such as cohesive soils and silty cohesion less soils. Stone column's applications includes (1) stabilizing the foundation soils to support embankments, approach fills and reconstruction work on weak cohesive soils, (2) supporting retaining structures (including Reinforced Earth), bridge bent and abutment structures on slightly marginal soft to stiff clays and loose silty sands, (3) landslide stabilization and (4) reducing liquefaction potential of clean sands. Also, stone columns under proper conditions may be greatly decrease the time required for primary consolidation. The stone column technique of ground behavior has proven successful in (1) improving slope stability of both embankments and natural slopes, (2) increasing bearing capacity, (3) reducing total and differential settlements, (4) reducing the liquefaction potential of sands and (5) increasing the time rate of settlement. Stone column construction involves the partial replacement of unsuitable subsurface soils with a compacted vertical column of stone that usually completely penetrates the weak strata. When jetting water is used the process is named vibro-replacement and when used without jetting water in partially saturated soils such as old rubble fill, the process is known as vibro-displacement. This book can be help to engineers and researchers on stone columns. I would also like to thank my parents and my wife. The author is grateful to the engineers for their efforts in preparing the excellent works included in the world. The author has helped provide to the profession significant information on which to base current decisions on soil improvement and on which to build for future works.
Download or read book Geotechnical Engineering Handbook written by Braja M. Das and published by J. Ross Publishing. This book was released on 2011 with total page 801 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Geotechnical Engineering Handbook brings together essential information related to the evaluation of engineering properties of soils, design of foundations such as spread footings, mat foundations, piles, and drilled shafts, and fundamental principles of analyzing the stability of slopes and embankments, retaining walls, and other earth-retaining structures. The Handbook also covers soil dynamics and foundation vibration to analyze the behavior of foundations subjected to cyclic vertical, sliding and rocking excitations and topics addressed in some detail include: environmental geotechnology and foundations for railroad beds.
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.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2006 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Guide to Earthwork Construction written by National Research Council (U.S.). Transportation Research Board and published by Transportation Research Board National Research. This book was released on 1990 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this Guide is to provide construction engineers and technicians with information on all aspects of earthwork construction. Although it is not intended to be a design manual, it does contain considerable background on the design concepts that are necessary for good earthwork construction. The Guide is divided into ten chapters.
Download or read book Inside Magazine written by and published by . This book was released on 2000 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ground Improvement written by Professor Jian Chu and published by Elsevier. This book was released on 2005-11-07 with total page 1137 pages. Available in PDF, EPUB and Kindle. Book excerpt: - The first book of its kind, providing over thirty real-life case studies of ground improvement projects selected by the worlds top experts in ground improvement from around the globe. - Volume 3 of the highly regarded Elsevier Geo-engineering book series coordinated by the Series Editor: Professor John A Hudson FREng. - An extremely reader friendly chapter format. - Discusses wider economical and environmental issues facing scientists in the ground improvement.Ground improvement has been both a science and art, with significant developments observed through ancient history. From the use of straw as blended infill with soils for additional strength during the ancient Roman civilizations, and the use of elephants for compaction of earth dams during the early Asian civilizations, the concepts of reinforced earth with geosynthetics, use of electrokinetics and thermal modifications of soils have come a long way. The use of large and stiff stone columns and subsequent sand drains in the past has now been replaced by quicker to install and more effective prefabricated vertical drains, which have also eliminated the need for more expensive soil improvement methods.The early selection and application of the most appropriate ground improvement techniques can improve considerably not only the design and performance of foundations and earth structures, including embankments, cut slopes, roads, railways and tailings dams, but also result in their cost-effectiveness. Ground improvement works have become increasingly challenging when more and more problematic soils and marginal land have to be utilized for infrastructure development.This edited compilation contains a collection of Chapters from invited experts in various areas of ground improvement, who have illustrated the basic concepts and the applications of different ground improvement techniques using real projects that they have been involved in. The case histories from many countries ranging from Asia, America, Australia and Europe are addressed.
