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Title: Large diameter sampling and testing in offshore site investigation
Authors: Chua, K.E.
Lim, S.K.
Lim, J.
Chew, S.H. 
Bharati, S.K. 
Keywords: Large diameter Oedometer test
Large diameter sampling
Large diameter triaxial test
Large diameter undisturbed soil samples
Issue Date: 2011
Source: Chua, K.E.,Lim, S.K.,Lim, J.,Chew, S.H.,Bharati, S.K. (2011). Large diameter sampling and testing in offshore site investigation. 14th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering : -. ScholarBank@NUS Repository.
Abstract: In conjunction with a large future land development at the near shore off the East coast of Singapore, it is necessary to conduct a detailed soil investigation work to understand the in-situ geotechnical behavior of the soft marine clay. Conventionally, a small size sample is used for determination of the strength and consolidation properties. However, such tests may suffer from the limitations of the small sample size as a small diameter sample may not truly represent the "fabric" and "structure" of the soils at the site. The in-situ soil is not as uniform or homogenous as represented by this small soil sample. Hence, in conjunction with this long-term mega near-shore development project, a large diameter sampling and testing research project is envisaged. In this project, great effort has been made to design a large diameter sampler to collect high quality undisturbed soil sample of up to 250 mm diameter and up to 1000 mm height. The corresponding large diameter sample extruder was also designed and fabricated in NUS geotechnical engineering laboratory. A large diameter triaxial test apparatus for 200 mm diameter sample size was designed and developed. The results from the large diameter triaxial sample tests were compared with the conventional small diameter triaxial sample test. The results showed significant difference between the two tests. The results show the present of sandy soil patches within the clayey soil matrix, which was clearly revealed in the failure plan of the large diameter samples after the test, but was not observed in the small diameter samples. There was also noticeable difference in results obtained from large diameter Oedometer test as compared to that of conventional small diameter Oedometer test.
Source Title: 14th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering
Appears in Collections:Staff Publications

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