Influence of Soil Properties and Composition, and Applied Hydraulic Pressures on Sample Quality of Pusan Clays

##plugins.themes.bootstrap3.article.main##

  •   Ganapathi Rao Konni

Abstract

Obtaining  good quality samples from soft marine clay deposits is a challenge and it is being seen that the sample disturbance is inevitable even though lot of research has suggested using more sophisticated samplers, sampling methods, and special care being taken while handling and transportation of the samples. Hence, author doubt that apart from the above, there could also be other parameters playing critical role on the sample quality. Therefore, in the current study, sampling tube geometry is maintained same, especially angle of cutting edge and area ratio which are found to be key influencing factors and hence its impact on the current study is ignored. In the current study in order to assess the other contributing factors behind the additional sample disturbance, a special attention is given to find out other possible parameters that could also influence the sample quality. As a result of this study, it is found that the soil properties such as; silt and sand content in the soil, clay fraction, hydraulic pressure applied to penetrate the sampler, rigidity index of the soil, initial void ratio, plasticity index, and unit weight of the soil also contribute to sample disturbance. Since these properties, except hydraulic pressure, are soil inherent properties, there is always a certain minimum degree of sample disturbance associated with these soil inherent properties depending on the magnitude of these parameters. Unfortunately, the soil properties cannot be changed and thus a minimum sample disturbance is inevitable.   

 


Keywords: Soft marine clay, sample quality, influence of soil properties, soil composition, same sampler geometry, hydraulic pressure, inevitable

References

Andresen, A., and Kolstad, P. 1979. The NGI 54 mm sampler for undisturbed sampling of clays and representative sampling of coarser materials. In Proceedings of the International Symposium of Soil Sampling, Singapore, 28 July 1979, Japanese Society of Soil Mechanics and Foundation Engineering. pp. 13–21.

Andresen, K. H. Rawlings, C. G, Lunne, T. A., and Trond, H. (1994), Estimation of hydraulic fracture pressure in clay, Canadian Geotechnical Journal; Vol. 31, PP.817 -828

Chung, S.G., Kwag, J.M., Giao, P.H., Back, S.H., Prasad, K.N., 2004. A study of soil disturbance of Pusan clays with reference to drilling, sampling and extruding. Geotechnique 54 (1), 61–65.

K.G. Rao, 2005, “Comprehensive experimental investigation for Characterization of Pusan Clays in the west coast of Nakdong River estuary”, Ph.D Thesis, Dong-A University, Pusan, South Korea

Lunne, T., Berre, T., and Strandvik, S. 1997. Sample disturbance effects in soft low plastic Norwegian clay. In Proceedings of the Conference on Recent Developments in Soil and Pavement Mechanics, Rio de Janeiro, Brazil, 25–27 June 1997. A.A. Balkema, Rotterdam. pp. 81–102.

Ohtsubo, M. et. al (1995) “Depositional and post-depositional geochemistry , and its correlation with the geotechnical properties of marine clays in Ariake bay, Japan, “ Geotechnique, Vol. 45, No. 3, PP. 509-523.

ISSMFE (1988) “Cone Penetration Test (CPT): International Reference test procedure,” Proc. Of the 1st Int. symposium on penetration testing, Vol. 1 PP. 27-52.

Vuthy Horng, Hiroyuki Tanaka, and Takashi Obara. 2010. Effect of sampling tube geometry on soft clayey sample quality evaluated by non-destructive methods. Journal of soils and foundations, Vol. 50, No.1, PP 93-107

Zhang, Z. & Tumay, M.T “The Nontraditional Approaches in Soil Classification Derived from the Cone Penetration Test” ASCE Special Publication No. 121, Probabilistic Site Characterization at the National Geotechnical Experimentation sites, February 2003, pp. 101.

Downloads

Download data is not yet available.

##plugins.themes.bootstrap3.article.details##

How to Cite
[1]
Konni, G. 2017. Influence of Soil Properties and Composition, and Applied Hydraulic Pressures on Sample Quality of Pusan Clays. European Journal of Engineering and Technology Research. 2, 1 (Jan. 2017), 32-38. DOI:https://doi.org/10.24018/ejers.2017.2.1.238.