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Liquefaction potential assessment of a region using different techniques (Tepebasi, Eskişehir, Turkey)

Author:
Kayabasi, A., Gokceoglu, C.
Source:
Engineering geology 2018 v.246 pp. 139-161
ISSN:
0013-7952
Subject:
alluvium, earthquakes, equations, geophysics, laboratory experimentation, liquefaction, probability, rivers, sand, soil, Turkey (country)
Abstract:
Eskişehir is a city in Turkey that is located primarily on the Porsuk river alluvium deposits. Hence, the probability of liquefaction is a geotechnical problem in this city. In this study, the liquefaction potential was investigated using a standard penetration test (SPT) and downhole geophysical test. Menard pressuremeter tests were also performed in order to modify liquefaction analysis methods with this test. Laboratory tests were performed on standard penetration split sampler samples collected from the boreholes. Liquefaction analysis was performed considering different scenarios. The first peak horizontal acceleration value was determined from the earthquake that occurred in 1956, which was 6.4 Mw. The second peak horizontal acceleration value was determined from Çukurhisar-Sultandere fault, which is approximately 40 km long and may create a 6.94 Mw earthquake with a peak horizontal acceleration of amax = 0.48 g. There are some differences between SPT-N method and Vs method but both the SPT-N method and the Vs method are harmonious with each other in general for determination of the liquefable soils. The Vs method particularly results in a continuous profile for the liquefaction determination. There is no regional liquefaction potential in the study region, but locally liquefiable silty sand layers were determined. The liquefable layer thickness increases with increasing peak horizontal acceleration. A liquefaction analysis method using the Menard pressuremeter test is suggested in this study. Both the cyclic resistance ratio (CRR) chart and the equation are modified for liquefaction analysis using the Menard pressuremeter test.
Agid:
6225804