Volume 41 Issue No. 3 September 2010 – SEAGS

The recent advances in pile testing and diaphragm wall construction in Japan

itsupport installer — Wed, 28 Oct 2015 05:59:52 +0000

Geotechnical Engineering Journal of the SEAGS & AGSSEA ISSN 0046-5828

Vol. 41 No. 3 September 2010

The recent advances in pile testing and diaphragm wall construction in Japan

Kenji Ishihara

ABSTRACT: The first part of this paper consists of brief introduction of the in-situ pile loading tests that have been conducted in Japan over the last two decades in connection with the design and construction of high-rise buildings in areas of soft soil deposits. In addition to the conventional types of tests in which the load is applied at the top and at the toe of the pile (O-cell test), what may be called “pile toe bearing test” and “skin friction test” is introduced. The results of these tests are described and compared with those from the conventional type of the pile loading tests. In-situ prototype tests are also introduced in which bearing power of Barrette type pile is compared with that of the circular type pile. A special case of in-situ pile loading tests conducted in Singapore is also introduced in which the friction between the circular ring-shaped concrete segment and the surrounding soil deposit was measured directly during excavation of the shaft by applying loads up and down by jacks installed between two adjacent segments in vertical direction. The second part of this paper is a brief description on constructions of large-diameter circular diaphragm walls that was carried out about 10 years ago for the LNG storage tank in the coastal site in Tokyo Bay. The construction of the large-scale Kawasaki Island in the middle of Tokyo Bay in Japan will also be introduced. The whole scheme and process of construction is for these two undertakings is introduced with some comments on observed behaviour of the walls and on special precaution taken during construction.

KEYWORDS: Pile Testing, Diaphram Wall Construction, JAPAN

DOI: 10.14456/seagj.2010.9

Ground Improvement – A Green Technology towards a Sustainable Housing, Infrastructure and Utilities Developments in Malaysia

itsupport installer — Wed, 28 Oct 2015 05:59:09 +0000

Geotechnical Engineering Journal of the SEAGS & AGSSEA ISSN 0046-5828

Vol. 41 No. 3 September 2010

Ground Improvement – A Green Technology towards a Sustainable Housing, Infrastructure and Utilities Developments in Malaysia

Kenny Yee and Ooi Teik Aun

ABSTRACT: In the rapid expansion in housing, infrastructure and utilities developments in the last 30 years, engineers have to deal with less favourable sites such as coastal lowlands, swamps, filled ground, reclaimed land, etc. A number of mega size infrastructure projects such as the construction of the 966-km North-South Expressway, the 179-km electrified double-tracking railway project between Rawang and Ipoh, etc. would have been economically non-viable and/or technically non-feasible if they had been constructed using conventional methods meant for good soil conditions. For these mega projects and other similar projects, it was necessary to explore the innovations of using non-conventional methods when poor soil conditions may impair the integrity and serviceability of the structures. In such situations, the natural condition of poor soil needs to be altered to meet the project requirements where settlement requirements are more stringent and poor ground strength needs to be significantly improved. This is termed as ground improvement. The common types of ground improvement used are described in this paper. Due to the increasing awareness of the construction impact on the environment, sustainable construction techniques using green technology such as ground improvement is also increasingly used. A carbon footprint auditing system is introduced for some of the commonly used ground improvement methods.

KEYWORDS: Ground Improvement, A Green Technology, Sustainable Housing, Infrastructure, Utilities Developments, Malaysia

DOI: 10.14456/seagj.2010.6

The Enhancement of Pile Capacity by Shaft Grouting Technique in the Ruspa Bridge Project in Bangladesh

itsupport installer — Wed, 28 Oct 2015 05:58:36 +0000

Geotechnical Engineering Journal of the SEAGS & AGSSEA ISSN 0046-5828

Vol. 41 No. 3 September 2010

The Enhancement of Pile Capacity by Shaft Grouting Technique in the Ruspa Bridge Project in Bangladesh

Ryuji Manai

ABSTRACT: This paper makes the presentation of the author’s experience of the pile construction for the Rupsa Bridge Construction Project in Bangladesh. The initial pile loading tests for cast-in-situ pile of diameter 2500mm and 75m long constructed in Rupsa River, one of the branch River of Ganges River, resulted in failure at the early stage of the loading test due to the dispersive behavior of the soil which likely have reduced the skin friction and end bearing capacity. In order to enhance the pile capacity, base grouting and shaft grouting technique was adopted. The result of application of this technique has achieved the pile capacity as high as 5 to 7 times that of plain piles which is far more than the previously reported 1.5 to 3 times in the other projects using the same shaft grouting technique. The paper describes the detailed know-how of the technique.

KEYWORDS: Pile Capacity, Shaft Grouting Technique, Rupsa Bridge Project

DOI: 10.14456/seagj.2010.8

Piled Raft – A Cost-Effective Foundation Method for High-Rises

itsupport installer — Wed, 28 Oct 2015 05:58:15 +0000

Geotechnical Engineering Journal of the SEAGS & AGSSEA ISSN 0046-5828

Vol. 41 No. 3 September 2010

Piled Raft – A Cost-Effective Foundation Method for High-Rises

Phung Duc Long

ABSTRACT: During the last decades, the quick growth of cities all over the world has led to a rapid increase in the number and height of high-rise and super high-rise buildings. High-rises often rest on pile foundations, which are designed using the conventional method, where the piles take the full load from the superstructure. Recently it is increasingly recognised that the use of piles to reduce the foundation settlement and differential settlement can lead to considerable savings. Only a limited number of piles, called settlement-reducers, may improve the ultimate load capacity, the settlement performance, as well as the required thickness of the raft. In this article the result from the Author’s experiment study, which strongly supports the concept of settlement-reducers in non-cohesive soil, are reviewed. Applications of FEM in design of piled-raft foundations for high-rises are also discussed.

KEYWORDS: Piled Raft, A Cost-Effective Foundation Method, High- Rises

DOI: 10.14456/seagj.2010.7