Effects of crude oil pollution on the shear strength behaviour of an unsaturated porous soil medium

Mohammadi, Mohammad Hossein; Yasrebi, S; Mirzaii, Ali

doi:10.1201/b10526-231

Cited by 2 publications

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“…As the oil content increased, the plasticity index, optimum water content and cohesion decreased and the maximum dry density, compressibility and internal friction angle increased. Mohammadi et al [4] carried out direct shear tests to study the effect of crude oil contamination on the shear strength properties of a kaolin-sand mixture in saturated and unsaturated conditions. The results showed the tendency of contaminated soil to sustain more shear stress than similar uncontaminated samples both in the absence and presence of air in the void spaces.…”

Section: Introductionmentioning

confidence: 99%

Pre- and post-cyclic behaviour of an unsaturated clayey soil contaminated with crude oil

2018

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Besides adverse impacts on the environment, pollution with hydrocarbon compounds such as crude oil affects the geotechnical parameters like deformation modulus and shear strength. The present research involves evaluation of clayey soil properties changes in an unsaturated state due to application of cyclic loads before and after contamination with crude oil. A series of constant water content (CW) static and dynamic triaxial tests were conducted on samples that were compacted to the same dry density but different degrees of saturation and net confining pressures. The soil studied was provided from a place near an oil refinery located in Iran's capital city and was artificially polluted with 3%, 6% and 9% crude oil. Deformation modulus reduction due to cyclic loads application was considerably more than reduction of shear strength. Also, these parameters increased due to increasing net confining pressure and initial matric suction. Several chemical tests and techniques were employed to investigate the chemical variations in soil structure and the role of different chemical components of crude oil on quantitative variations of soil characteristics.

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Section: Introductionmentioning

confidence: 99%

Pre- and post-cyclic behaviour of an unsaturated clayey soil contaminated with crude oil

2018

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“…The observed increase in the value of effective cohesion of contaminated sand samples can be explained regarding to the dynamic viscosity of the LNAPL and its distribution in the soil pore spaces of soil samples, according to the study recently developed by Mohammadi et al (2011) Finally, it should be noted that cohesion is a parameter generally dependent on the clayey fraction of the sample, this factor must be taken into consideration and there is a high risk of error by applying [5.5]. Cohesion values, for this case, correspond to a linear Mohr-Coulomb approximation and the curvature (nonlinearity) of the failure envelope observed within the test carried out herein.…”

Section: Sandsmentioning

confidence: 98%

Geotechnical Analysis of Contaminated Sand by Light Non-Aquous Phase Liquids

Serrano¹

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Caminos, Canales y Puertos del Estado) and to obtain work in the Laboratorio de Geotecnia at CEDEX (Ministerio de Fomento), Jose Manuel Martinez, the person in charge of the area where I was assigned, suggested that I focus on this work in a geotechnical ambit in which not many studies were available and further research was yet to be made. Both of them academic co-directors of the present work, helped me in a wide range of issues and are the first two people I would like to mention and to express respect for their support and guidance. My very special thanks to Carlos Delgado who encouraged me to carry out geotechnical tests at EUITOP Soil Mechanics Laboratory and helped me unconditionally to finish this work. I could never have reached the end of the research without the help, support and efforts of so many people. Firstly, I would like to thank my advisor at NYU-Polytechnic Institute at New York (USA) Magued Iskander who brought me, maybe, one of the best opportunities of my academic life, making possible an amazing period of research in the USA, supported by of the 2010/2011 Ministerio de Fomento -Fulbright Scholarship. In the same way I would like to thank Raymond Sandiford, Chief Geotechnical Engineer of the Port Authority of New York and New Jersey, for his kind treatment during the same mentioned Fulbright Fellowship and allowing me the opportunity to learn engineering during these nine months at such a huge and reputable agency. I would like to thank my mates at Port Authority in Newark for their good partnership, Omar Choukeir, Frank D'Antonio, Gerry Lautenschlager, Nerik Yakubov and Sudhir Sheth, and the rest of the large geotechnical group. Especially, Ido not forget the attention given by Samuel Leifer, the patience of Stephen Law and the fascinating day at the WTC site works provided by John Lizzo, at one of the more difficult and important engineering projects that I have ever seen. This acknowledgment would be incomplete if I did not mention the help of Silvio Martinez who made the effort of introducing me to a very interesting group of people.Crossing from Newark to Brooklyn, I am so glad to have known such good engineers and even better people such as Ivan Guzman and Mehdi Omidvar to share so much work, enthusiasm and friendship. Kazunori Tabe who introduced me to the transparent soils "world" and Eduardo Suescun for helping me to better understand the few but complex unsaturated soils aspects of the research. I wish the best of luck to my mate Sina Rassaei in his further research. I want to express my gratitude to Arlissa and Ben Barnes for their friendship and their eventual help.Nothing stuted above could have been possible without the support of the 2010/2011 Ministerio de Fomento -Fulbright Scholarship. I would like to thank all the Fulbright Commission staff at Spain for their continuosly help and positive attitude, specially to Victoria Ruiz and Guy Vanover. The same can be said for Delfina Rodriguez at Ministerio de Fomento.I would like to thank Vicente Negro and Juan Ignacio Grau for th...

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Effects of crude oil pollution on the shear strength behaviour of an unsaturated porous soil medium

Cited by 2 publications

References 1 publication

Pre- and post-cyclic behaviour of an unsaturated clayey soil contaminated with crude oil

Pre- and post-cyclic behaviour of an unsaturated clayey soil contaminated with crude oil

Geotechnical Analysis of Contaminated Sand by Light Non-Aquous Phase Liquids

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