An Underwater Plate Load Testing for the Sand Compaction Pile Ground at Island-Tunnel Conversion Area PDF Download
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Author: Yan-ning Wang
Publisher:
ISBN:
Category : Soil compaction
Languages : en
Pages : 18
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Book Description
The sand compaction pile (SCP) method is a widely used ground improvement technique, especially in offshore engineering. The thick, soft marine clay in Hong Kong-Zhuhai-Macau Bridge was reinforced using this method at its island-tunnel conversion area. A large-scale plate loading test was conducted to evaluate the bearing capacity and deformability of the SCP composite ground. An improved settlement result was obtained by utilizing a high-sensitivity liquid level sensor system underwater. The research results showed that the stress concentration ratio of the SCP composite ground was closely related to the load level, which decreased when the load level increased. When the stress stayed constant, the ratio was found to reduce gradually to a certain value. Three computing theories were discussed in the bearing capacity calculation of the SCP composite ground. The results calculated by the Hughes and Withers method were more consistent with the field experimental results. For the settlement calculation, it was found that the results were closer to the experiment results calculated by Aboshi's first empirical formula. The experiment results differed greatly when calculated by Aboshi's second empirical formula and the modified method proposed by Ahn and Kim. The study may provide some useful data for marine SCP composite ground designs and underwater field testing techniques.
Author: Yan-ning Wang
Publisher:
ISBN:
Category : Soil compaction
Languages : en
Pages : 18
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Book Description
The sand compaction pile (SCP) method is a widely used ground improvement technique, especially in offshore engineering. The thick, soft marine clay in Hong Kong-Zhuhai-Macau Bridge was reinforced using this method at its island-tunnel conversion area. A large-scale plate loading test was conducted to evaluate the bearing capacity and deformability of the SCP composite ground. An improved settlement result was obtained by utilizing a high-sensitivity liquid level sensor system underwater. The research results showed that the stress concentration ratio of the SCP composite ground was closely related to the load level, which decreased when the load level increased. When the stress stayed constant, the ratio was found to reduce gradually to a certain value. Three computing theories were discussed in the bearing capacity calculation of the SCP composite ground. The results calculated by the Hughes and Withers method were more consistent with the field experimental results. For the settlement calculation, it was found that the results were closer to the experiment results calculated by Aboshi's first empirical formula. The experiment results differed greatly when calculated by Aboshi's second empirical formula and the modified method proposed by Ahn and Kim. The study may provide some useful data for marine SCP composite ground designs and underwater field testing techniques.
Author: Magued Iskander
Publisher: Springer Science & Business Media
ISBN: 3642131085
Category : Science
Languages : en
Pages : 273
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Book Description
One of the major difficulties in predicting the capacity of pipe piles in sand has resulted from a lack of understanding of the physical processes that control the behavior of piles during installation and loading. This monograph presents a detailed blue print for developing experimental facilities necessary to identify these processes. These facilities include a unique instrumented double-walled pipe-pile that is used to delineate the frictional stresses acting against the external and internal surfaces of the pile. The pile is fitted with miniature pore-pressure transducers to monitor the generation of pore water pressure during installation and loading. A fast automatic laboratory pile hammer capable of representing the phenomena that occur during pile driving was also developed and used.
Author: M. Kitazume
Publisher:
ISBN:
Category : Bearing capacity
Languages : en
Pages : 15
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Book Description
Bearing capacity of the ground improved by sand compaction pile method is investigated primarily by a series of centrifuge model tests. Bearing capacities obtained under the various loading conditions are well explained by the simple stability analysis which has been commonly employed in Japan. The effectiveness of a simple construction control diagram is confirmed based on the deformation of the ground. These findings are also verified by the full scale load test leading to failure of the improved ground.
Author: Scott A. Ashford
Publisher:
ISBN:
Category : Piling (Civil engineering)
Languages : en
Pages : 568
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Book Description
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: Clark Stephen Morrison
Publisher:
ISBN:
Category : Materials
Languages : en
Pages : 306
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Book Description
Lateral-load tests were performed on a large-scale, well-instrumented group of piles in sand. A similar single pile, also well-instrumented, was tested in the same soil. The group of piles and the single pile were installed in Houston for previous research projects. The native clay soil was removed from the upper portion of the piles and replaced with clean sand. Cyclic lateral loads were applied to the piles, and the response of the instrumentation was recorded. The results of the loads test of the group are compared with the results of current design methods. The methods include DEFPIG, the Focht-Koch method, the single-pile method, and the Bogard-Matlock method. Because none of the methods provided entirely satisfactory results, an analytical procedure is provided which yields good agreement with the results of the load-test.
Author: Seth I. Bowles
Publisher:
ISBN:
Category : CD-ROMs
Languages : en
Pages : 199
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Book Description
Three progressively larger statnamic lateral load tests were performed on a 2.59 m diameter drilled shaft foundation after the surrounding soil was liquefied using down-hole explosive charges. An attempt to develop p-y curves from strain data along the pile was made. Due to low quality and lack of strain data, p-y curves along the test shaft could not be reliably determined. Therefore, the statnamic load tests were analyzed using a ten degree-of-freedom model of the pile-soil system to determine the equivalent static load-deflection curve for each test. The equivalent static load-deflection curves had shapes very similar to that obtained from static load tests performed previously at the site. The computed damping ratio was 30%, which is within the range of values derived from the log decrement method.
Author: Professor Jian Chu
Publisher: Elsevier
ISBN: 0080457363
Category : Science
Languages : en
Pages : 1137
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Book Description
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.
Author: Society for Underwater Technology
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 308
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Book Description
Author: Jan van 't Hoff
Publisher: CRC Press
ISBN: 0415698448
Category : Science
Languages : en
Pages : 674
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Book Description
Without proper hydraulic fill and suitable specialised equipment, many major infrastructure projects such as ports, airports, roads, industrial or housing projects could not be realised. Yet comprehensive information about hydraulic fill is difficult to find. This thoroughly researched book, written by noted experts, takes the reader step-by-step through the complex development of a hydraulic fill project. Up-to-date and in-depth, this manual will enable the client and his consultant to understand and properly plan a reclamation project. It provides adequate guidelines for design and quality control and allows the contractor to work within known and generally accepted guidelines and reasonable specifications. The ultimate goal is to create better-designed, more adequately specified and less costly hydraulic fill projects. The Hydraulic Fill Manual covers a range of topics such as: • The development cycle of a hydraulic fill project • How technical data are acquired and applied • The construction methods applicable to a wide variety of equipment and soil conditions, the capabilities of dredging equipment and the techniques of soil improvement • How to assess the potentials of a borrow pit • Essential environment assessment issues • The design of the hydraulic fill mass, including the boundary conditions for the design, effects of the design on its surroundings, the strength and stiffness of the fill mass, density, sensitivity to liquefaction, design considerations for special fill material such as silts, clays and carbonate sands, problematic subsoils and natural hazards • Quality control and monitoring of the fill mass and its behaviour after construction. This manual is of particular interest to clients, consultants, planning and consenting authorities, environmental advisors, contractors and civil, geotechnical, hydraulic and coastal engineers involved in dredging and land reclamation projects.
Author: Willis H. Thomas
Publisher: CRC Press
ISBN: 0203964292
Category : Technology & Engineering
Languages : en
Pages : 566
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Book Description
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
