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-  2015 

Comparison of Standard Penetration Test (SPT) Methods for Evaluating Seismic Liquefaction Potential

DOI: 10.3969/j.issn.1000-0844.2015.03.0794

Keywords: 砂土液化,判别方法,临界标贯击数
sand liquefaction
,evaluation method,critical SPT blow counts

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For the standard penetration test (SPT) method for evaluating seismic liquefaction potential,the liquefaction potential evaluation method recommended by the National Center for Earthquake Engineering Research (NCEER) is typically applied abroad;however,methods recommended by the code for geological investigation of water resources and hydropower engineering (GB50487-2008) and that for seismic design of buildings (GB50011-2010) are used domestically.These methods different in the following aspects:(1) earthquake liquefaction field investigation data;(2) liquefaction criterion;(3) method for reflecting the influence of earthquake magnitude;and (4) method for considering the influence of fines content.In this paper,the method recommended by NCEER is expressed by the curve of critical liquefaction blow count versus depth;a comparison is made between this curve and that determined by domestic methods.Under the same intensity,domestic methods tend to be safe for near earthquakes and distant earthquake with magnitude less than 7.5.For earthquakes with magnitudes of 7.5~8.5,critical liquefaction blow counts calculated by using the NCEER method are close to that calculated by domestic methods under specific acceleration,which tends to be safe depending on the specific acceleration.For distant earthquakes (design earthquake group 2),under the magnitude of M=8.0 and seismic intensity of Ⅶ and Ⅸ,the critical liquefaction blow counts calculated by the different methods are very close;under the intensity of Ⅷ,the NCEER method tends to be safe.For distant earthquakes (design earthquake group 3),the domestic methods tend to be safe with magnitude not more than 8.0.With the magnitude of M=8.5 and acceleration amax=0.3g,the critical liquefaction blow counts calculated by the different methods are close.The NCEER method tends to be safe with acceleration less than 0.3g,whereas the domestic methods tend to be safe with that more than 0.3g.For domestic methods,under distant earthquakes (design earthquake group 2),the critical liquefaction blow counts calculated by the different methods are close with a difference of less than 2.5 blow counts.The method used in the code


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