Loading...

The Effect of Gas-oil Contamination on Geomechanical Properties of Sandy Clay Soils

Zohrehvand, Pejman | 2015

953 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47869 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Sedghiani, Mohammad Hossein
  7. Abstract:
  8. During recent years, decay, fraction, corrosion and leakage of oil pipe lines have resulted in soil pollution. Gas oil is one of the main causes of soil pollution in different places. Soil and pollutant interaction results in varying soil geotechnical properties which causes shear strength, permeability, etc. to change drastically. After careful recognition of the problem, it should be encountered in a good manner. Therefore, comprehensive investigation regarding the effect of oil production on soil should be done. In this thesis, properties of combination of sand, kaolinite and pollutant in different situation such as different fine grain content, different relative compaction, and different pollutant percentage were investigated using direct shear, Atterberg limits, standard compaction tests, and electronic microscopic photos. Results showed that adding pollutant to Sand-Clay soil will result in different maximum dry density, optimum water content, plasticity index, shear strength, cohesion and friction angle in different conditions as mentioned above. Increment in gas-oil content increases maximum dry density to an epic value and decrease it gradually afterward. Atterberg limits will decrease after adding gas-oil. Friction angle will lower after pollutant increment which is more drastic in higher compaction and lower fine percentage. On the other hand, cohesion will change in an opposite manner which will increase more in higher fine grain content and higher compaction. Generally, the results show that adding pollutant especially in higher normal stress causes shear strength to lower more. Investigating on sand-clay soil texture reveals that increment in pollutant will results in lower porosity and more flocculated texture. Consequently, higher cohesion is the result. In addition, aggregation dispersion causes higher interface and friction among grains
  9. Keywords:
  10. Shear Strength ; Gas oil ; Chemical Processes ; Kaolinte ; Textures ; Cohesive Soil ; Compressibility ; Pollutant Leakage ; Sandy-Clay Soils

 Digital Object List

 Bookmark

No TOC