Investigation of Erzurum Ilıca District Liquefaction Potential With Different Methods

Soil liquefaction is the sudden loss of strength and stiffness in water-saturated, loose, andcohesionless (non-clayey) granular soils (especially sandy and silty soils) due to cyclicdynamic loading (vibrations) during an earthquake. As a result, the soil, instead ofbehaving like a solid, temporarily becomes fluid, like a viscous liquid. When liquefactionoccurs, 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 thesisstudy, it was aimed to determine the liquefaction potential to be obtained as a result ofexamining the liquefaction potential of Erzurum Ilıca District with the methods given byIwasaki 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 andsaturated unit volume weight, sieve analysis and hydrometer tests were carried out in thelaboratory on the samples taken from the research pits. Using data obtained from fieldand laboratory experiments, Iwasaki et al. and Sönmez and Gökçeoğlu the liquefactionpotential was examined. As a result of field and laboratory tests, the average values wereSPT-N 12.3, Natural unit volume weight 11.53 (kN∕m3), Saturated unit volume weight12.70 (kN∕m3), Plasticity Index 23.63, Clay Content % 20.13, fine grain content wasdetermined to be 75.9%. Depending on these values, liquefaction potential analyzes weremade according to Iwasaki et al. and Sönmez-Gökçeoğlu. As a result of the field andlaboratory 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.