Investigation of Erzurum Ilıca District Liquefaction Potential With Different Methods

Soil liquefaction is the sudden loss of strength and stiffness in water-saturated, loose, and

cohesionless (non-clayey) granular soils (especially sandy and silty soils) due to cyclic

dynamic loading (vibrations) during an earthquake. As a result, the soil, instead of

behaving like a solid, temporarily becomes fluid, like a viscous liquid. When liquefaction

occurs, the soil loses its bearing capacity, causing foundations to sink, tilt, or topple.

Permanent deformations such as sand volcanoes, horizontal spreading (lateral spreading),

and excessive settlement occur on the ground surface. Within the scope of the thesis

study, it was aimed to determine the liquefaction potential to be obtained as a result of

examining the liquefaction potential of Erzurum Ilıca District with the methods given by

Iwasaki et al. and Sönmez and Gökçeoğlu. In the study, Standard Penetration Test (SPT)

was performed in the boreholes drilled in the field. Consistency limits, natural and

saturated unit volume weight, sieve analysis and hydrometer tests were carried out in the

laboratory on the samples taken from the research pits. Using data obtained from field

and laboratory experiments, Iwasaki et al. and Sönmez and Gökçeoğlu the liquefaction

potential was examined. As a result of field and laboratory tests, the average values were

SPT-N 12.3, Natural unit volume weight 11.53 (kN∕m3

), Saturated unit volume weight

12.70 (kN∕m3

), Plasticity Index 23.63, Clay Content % 20.13, fine grain content was

determined to be 75.9%. Depending on these values, liquefaction potential analyzes were

made according to Iwasaki et al. and Sönmez-Gökçeoğlu. As a result of the field and

laboratory studies, it was determined that liquefaction was expected in SK-1 and SK-5,

while the liquefaction potential was very low in SK-2, SK-3, SK-4 and SK-6.