Liquefiability of Silts and the Vulnerability Map of Adapazari
Abstract eng: The city of Adapazarı, Turkey is notorious for the Mw≥7 earthquakes that strikes almost each decade. The event of 1999 was probably the worst in memory, because a major portion of the city was destroyed. The ground failures in the form of cyclic mobility, liquefaction and excessive settlements of buildings were widespread. A major investigation program was initiated at Sakarya University to diagnose the liquefaction potential of silts and clays intended to lead the investigators towards preparation of liquefaction and bearing capacity maps for the city. The program included drilling of 700 boreholes with standard penetration and laboratory testing, 300 cone penetration tests (CPTU, SCPTU) . A set of “Adapazarı Criteria” were proposed as a substitute for the Chinese Criteria. The criteria were compared to and aided by the surface observations made right after the quake. A database for the city of Adapazarı based on surface observations as well as field and laboratory test results using GIS methods is finally established. It is now possible to query the groundwater level, soil type, organic content, SPN N60, undrained shear strength, allowable bearing capacity and liquefaction potential for the top 15m depth. The results indicate that the soil conditions in the City are quite different from what has been published to date. This discrepancy is due to the fact that the vertical and horizontal variability of the soils is extremely high because of the formation processes involved.
Contributors:
Conference Title:
Conference Title:
14th World Conference on Earthquake Engineering
Conference Venue:
Bejing (CN)
Conference Dates:
2008-10-12 / 2008-10-17
Rights:
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Record created 2014-12-05, last modified 2014-12-05