Verification of a new method for evaluation of liquefaction potential analysis
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ORIGINAL PAPER
Verification of a new method for evaluation of liquefaction potential analysis Abbas Abbaszadeh Shahri & Katayoun Behzadafshar & Roshanak Rajablou
Received: 1 February 2011 / Accepted: 3 May 2011 / Published online: 3 June 2011 # Saudi Society for Geosciences 2011
Abstract The seismic response of existing earth dams in Iran is important after an earthquake both to provide emergency supplies and to society as well as to ensure structural safety in engineering terms. Better seismic capacity of earth dam results in less structural damage and reduced impacts following an earthquake disaster. Indirect as well as direct costs following earthquakes have gained much attention from both the engineering and socioec onomic research communities in the last few decades. This study is a valuable tool used to study the response of geotechnical structures to infrequent or extreme events such as earthquakes. The Avaj earthquake (2002, Iran) was applied to a series of model tests which was conducted to study the response of soil profiles under seismic loading. The acceleration records at different locations within the soil bed and at its surface along with the settlement records at the surface were used to analyze the soil seismic response. A combination of several software packages with a generated visual user interface computer code by authors named as “Abbas Converter” were employed to evaluate the variation of shear modulus and damping ratio with shear strain amplitude to assess their effects on site response. The proposed method was applied to the Korzan earth dam of Hamedan province in Iran. Site response analysis using the measured shear wave velocity, estimated A. Abbaszadeh Shahri (*) : R. Rajablou Department of Geophysics, Islamic Azad University, Hamedan Branch, Hamedan, Iran e-mail: [email protected] K. Behzadafshar Department of Physics, Islamic Azad University, Shahr-e-Rey Branch, Hamedan, Iran
modulus reduction, and damping ratio as input parameters produced good agreement with the computed site response in this study. Keywords Avaj earthquake . Soil behavior . Hamedan province . “Abbas Converter”
Introduction On 22 June 2002, at 07:28:20 local time, a destructive earthquake struck some vast regions in Qazvin, Hamedan, and Zanjan provinces in Iran. This earthquake was also felt in Tehran, Kermanshah, Qom, Central, Ardabil, and Giulan provinces as well as those indicated in Fig. 1. The magnitude of the earthquake was determined to be mb =6.0 by the Geophysics Institute of Tehran University, Ms =6.0 by the National Earthquake Information Center, and Mw =6.5 by the US Geological Survey (USGS 2002). The focal depth of the event, according to the USGS report (USGS 2002), was approximately 10 km. The main shock was recorded by 50 accelerograph stations. At a station in Avaj, 28 km from the epicenter, the maximum horizontal and vertical accelerations were recorded at approximately 0.5 and 0.26 g, respectively. The epicenter coordinates of the earthquake was estimated at a point with 48.93 longitude an
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