The Experts below are selected from a list of 61305 Experts worldwide ranked by ideXlab platform
Jian Chu - One of the best experts on this subject based on the ideXlab platform.
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Use of Biogeotechnologies for Soil Improvement
Ground Improvement Case Histories, 2015Co-Authors: Jian Chu, Volodymyr Ivanov, Maryam MaeimiAbstract:Abstract In this chapter, the principles of microbial geotechnical-based Soil Improvement methods are explained. Studies on the establishment of different applications of three biogeotechnological methods for Soil Improvement are presented. These include the biogas desaturation method for mitigation of Soil liquefaction, which may become the most cost-effective method for the reduction of liquefaction risks; the biocrust method for the construction of temporary water storage pond in sandy Soil; the biogrouting method for the protection of levees from erosion and seepage failure; and the biogrouting method for road construction and repair using biogrout made of waste materials. Although these biogeotechnological-based Soil Improvement methods have not yet been commonly adopted for real-world projects, they offer many advantages over the existing methods in terms of both cost and simplicity in construction and thus have the potential to become attractive Soil Improvement methods in the future.
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Use of Explosion in Soil Improvement Projects
Ground Improvement Case Histories, 2015Co-Authors: Shuwang Yan, Jian ChuAbstract:Abstract Explosion has been used in several Soil Improvement methods in granular fill densification and in removing and replacing soft Soil layer. These methods are briefly reviewed and discussed. A new method, the so-called explosive replacement method, is described. This method uses the energy of explosion to remove and replace soft clay with crushed stones. Explosive charges are placed in the Soil to be improved according to a certain pattern. Crushed stones are piled up next to the area where charges are installed. The explosion creates cavities in the Soil and causes the pile of crushed stones to slide into the exploded area. A case study on the use of this method for Soil Improvement works for a highway is present.
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Overview of preloading methods for Soil Improvement
Proceedings of the Institution of Civil Engineers - Ground Improvement, 2014Co-Authors: Jian Chu, Shuwang Yan, Buddhima Indraratna, Cholachat RujikiatkamjornAbstract:A review of the recent developments in soft Soil Improvement through consolidation or preloading is presented in this paper. The topics covered range from fundamental analysis to methods of implementation. Various methods and processes related to vertical drains, vacuum preloading or combined vacuum and fill surcharge, and dynamic consolidation with enhanced drainage or vacuum are compared and discussed. Factors affecting the design and analyses for the methods discussed are also elaborated.
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Soil Improvement works for an offshore land reclamation
Proceedings of the Institution of Civil Engineers - Geotechnical Engineering, 2009Co-Authors: Jian Chu, Arul ArulrajahAbstract:The Changi East reclamation project was carried out in five phases along the foreshore of the east coast of Singapore. The water depths in the reclaimed area ranged from 5 to 15 m. The project involved hydraulic placement of 272 million m3 of sand onto soft seabed marine clay up to 50 m thick. A linear total of 170,000 km of prefabricated vertical drains (PVDs) were installed for accelerating the consolidation process of the underlying soft marine clay. The Soil Improvement works covered a total area of approximately 1200 ha. In this paper, the site conditions and the Soil Improvement works adopted are described. Pilot tests with full-scale field instrumentations as well as laboratory and in situ tests were carried out to verify the design, check the effectiveness of the Soil Improvement works using PVDs, and establish the most suitable drain spacing. Field monitoring data obtained from both the pilot tests and the reclamation works are presented and interpreted. Degree of consolidation was calculated bas...
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Chapter 38 Use of explosion in Soil Improvement projects
Ground Improvement — Case Histories, 2007Co-Authors: S.w. Yan, Jian ChuAbstract:Abstract Explosion has been used in several Soil Improvement methods in granular fill densification and in removing and replacing soft Soil layer. These methods are briefly reviewed and discussed. A new method, the so-called explosive replacement method, is described. The new method uses energy of explosion to remove and replace soft clay with crushed stones. Explosive charges are placed in the Soil to be improved according to a certain pattern. Crushed stones are piled up next to the area where charges are installed. The explosion creates cavities in the Soil and causes the pile of crushed stones to slide into the exploded area. A case study on the use of this new method to the Soil Improvement works for a highway is present.
Victor Choa - One of the best experts on this subject based on the ideXlab platform.
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Reclamation and Soil Improvement on ultra-soft Soil
Ground Improvement, 2005Co-Authors: Victor Choa, K. S. WongAbstract:In recent years more and more reclamations have been carried out on waste ponds or mine tailing ponds. The deposits in these ponds are ultra-soft and may still be undergoing self-weight consolidation. Reclamation and Soil Improvement works in these areas are very challenging. They require special attention. Conventional reclamation and Soil Improvement methods are no longer workable. This paper highlights the experience obtained from reclamation and Soil Improvement works on such Soil in a project in Singapore. The fill was placed using a sand spreader, and the ultra-soft deposit was strengthened with a high-strength geotextile. Prefabricated vertical drains and staged construction were used to accelerate the consolidation process. The monitoring of settlement and pore pressure requires modification of conventional instruments to cater for the low strength of the ultra-soft Soil and the large strain of deformation. The paper also outlines a new method to estimate the settlement based on large-strain theor...
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Practical considerations for using vertical drains in Soil Improvement projects
Geotextiles and Geomembranes, 2004Co-Authors: Myint Win Bo, Victor ChoaAbstract:Abstract More than 140 million meters of prefabricated vertical drains (PVDs) have been installed for the Soil Improvement work for the Changi East land reclamation project in Singapore. Some useful design and practical experiences have been gained from the project over the years. The objective of this paper is to highlight some practical considerations in the use of PVDs in Soil Improvement projects. These include the factors that control the selection of PVDs, quality control tests for PVDs, selection of design parameters and smear effect. The adaptability of some of the design criteria is evaluated based on the Changi experience. A design approach of using a higher surcharge to shorten consolidation time is also elaborated.
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Soil Improvement works for Changi East Reclamation Project
Ground Improvement, 2001Co-Authors: Victor Choa, Jian ChuAbstract:Reclamation in Changi East, Singapore involved the formation of 2000 ha of land. The use of prefabricated vertical drains, combined with surcharge, was required to accelerate the consolidation settlement of the underlying soft compressible Soil throughout most of the area. The fill used was marine dredged sand which was placed mainly by hydraulic means and densified by various deep compaction methods such as dynamic compaction, vibroflotation and Muller resonance compaction. A comprehensive instrumentation scheme was used to monitor the process of consolidation. The various methods used for assessing the performance of the Soil Improvement works, namely Soil instrumentation, in situ tests and laboratory tests, are also discussed. The Soil Improvement works, which included the treatment of a siltpond filled with ultrasoft Soil and three pilot tests associated with the use of vertical drains, are also described and discussed. La recuperation de terre en Changi Est a Singapour comprend la formation d'un terr...
J Maertens - One of the best experts on this subject based on the ideXlab platform.
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Soil Improvement experiences in Belgium: Part III. Case histories
Proceedings of the Institution of Civil Engineers - Ground Improvement, 1997Co-Authors: W. F. Van Impe, F. De Cock, J. P. Van Der Cruyssen, J MaertensAbstract:The previous papers in this series concerning Soil Improvement experiences in Belgium dealt with a general overview of Soil Improvement techniques and an overview of performance practice and design...
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Soil Improvement experiences in Belgium: part I. Overview and dynamic compaction
Proceedings of the Institution of Civil Engineers - Ground Improvement, 1997Co-Authors: W. F. Van Impe, F. De Cock, J. P. Van Der Cruyssen, J MaertensAbstract:A lot of advanced Soil Improvement techniques can be considered as common practice in Belgium. Two types of procedures have reached a very high technological and engineering design level: Soil Improvement by vibratory compaction and Soil Improvement by stone columns. Of the former group of techniques, the experiences with resonant compaction are most promising, and a case history in Antwerp is discussed. Comparisons between resonant vibratory compaction efficiency on the one hand and more traditional vibratory compaction, casing driving compaction and stone column compaction on the other hand are made. This first contribution in a series of three gives an overview of the most commonly used Soil Improvement techniques including the heavy tamping method, in Belgium. In a second part, practice performance and design aspects concerning two more specific Soil Improvement techniques (vibrocompaction and stone columns) will be discussed. In a third contribution the overview of Soil Improvement experiences in Bel...
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Soil Improvement experiences in Belgium: part II. Vibrocompaction and stone columns
Proceedings of the Institution of Civil Engineers - Ground Improvement, 1997Co-Authors: W. F. Van Impe, F. De Cock, J. P. Van Der Cruyssen, J MaertensAbstract:This paper forms the second part in a series of three contributions on the Soil Improvement experience in Belgium. In the first part an overview of the Soil Improvement techniques most used in Belgium, including the heavy tamping methods, was given. This part continues with performance practice and design aspects of two more procedures (vibratory compaction and stone columns) which have reached a very high technological and engineering design level.
Li Zhao-fei - One of the best experts on this subject based on the ideXlab platform.
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Saline Alkali Soil Improvement and Utilization Techniques in Reclamation Area
Journal of Hebei Agricultural Sciences, 2010Co-Authors: Li Zhao-feiAbstract:There are 99.13 millions hectares saline alkali Soils in China,and there are many coastal saline alkaline Soils in Jiangsu.Nowadays,with the rapid economic development and farmland area continuous decrease,it has profound significance that strengthening the saline alkali Soil Improvement and utilization.The saline alkali Soil remediation techniques in reclamation area of Jiangsu Wutuhe Farm Co.,Ltd are summarized.The operational Soil Improvement and utilization techniques are given,which would play a guiding role in the sustainable development of agriculture economy of farm.
Dong Yun-lei - One of the best experts on this subject based on the ideXlab platform.
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Research Progress of Desulfurization Gypsum Saline-Alkali Soil Improvement
Journal of Anhui Agricultural Sciences, 2013Co-Authors: Dong Yun-leiAbstract:With the population-resource conflicts strengthening,saline-alkali Soil Improvement has become a common concerned problem.Utilization of industrial by-product gypsum can be effective in improving saline-alkali Soil and increasing crop yield.Principle,gypsum saline-alkali Soil Improvement methods and influence factors of gypsum saline-alkali Soil Improvement were reviewed.Emphatically,the application of gypsum,gypsum dosage and method of irrigation amount and frequency effects on gypsum improving alkaline Soil were discussed,as well as the gypsum saline-alkali Soil Improvement research ideas,in order to provide reference for gypsum Improvement of saline-alkali Soil.
