Manipal Journal of Science and Technology


The lithomargic clay (shedi soil) is the name given to the locally available silty sand, which is present in between weathered laterite and hard granite gneiss throughout the Konkan belt of Southern India. As long as this soil is confined and dry, there is no problem, but on the exposure in a cutting or when it is exposed to water, it loses its strength drastically. Hence, modification of this soil is necessary to reduce settlement and improve the bearing capacity. In the present investigation, Ordinary Portland cement was used as a stabilizer to improve the soil. The investigation revealed that there is a good improvement in the strength properties. Both the angle of the internal friction and the cohesion increased with the increase in the percentage of cement. There is decrease in the plasticity index with the increase in the percentage of cement. The compression index decreases with the increase in the percentage of cement, which decreases the possibility of settlement of the soil. The settlement analysis of the lithomargic clay and the lithomargic clay blended with 2.5%, 5%, 7.5%, and 10% cement for a square footing was carried out using Plaxis 3D. It was found that there was a decrease in the settlement and an increase in the load carrying capacity when the lithomargic clay was blended with cement. The results obtained in the present study will help to solve the problems associated with the lithomargic clay to a considerable extent.

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