砂土地基地震液化沉降的两种简易计算方法的对比分析
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摘要
利用两种简易方法对日本某核电站的砂性土地基在地震液化后的大变形沉降进行了计算和对比分析。这两种简易的实用方法只需要利用标准贯入试验数据就可以操作。计算结果表明,该核电站的砂性土地基在L2级地震作用下会发生较大的地面沉降,并可能对地下管线造成损坏。由于两种方法的计算原理相同,因此计算所得到的地基分层沉降趋势基本一致,但是在数值上存在着较大的差异,这主要是由于两种方法建立的基础试验数据不同以及具体计算方法上存在着差异所造成的。
Subsidence of a sandy ground in a nuclear power plant,Japan,is calculated using two kinds of simple methods.Only the data of SPT N-value is needed in calculation.The calculation results indicate that the ground will subside largely in a L2 level earthquake due to liquefaction.The two methods show the same trend of ground deformation because the basic principles of the two methods are the same.However,the subsidence value is much different,which is mainly caused by the different basic experimental data and the different ways for evaluating the volumetric strain of ground.
Subsidence of a sandy ground in a nuclear power plant,Japan,is calculated using two kinds of simple methods.Only the data of SPT N-value is needed in calculation.The calculation results indicate that the ground will subside largely in a L2 level earthquake due to liquefaction.The two methods show the same trend of ground deformation because the basic principles of the two methods are the same.However,the subsidence value is much different,which is mainly caused by the different basic experimental data and the different ways for evaluating the volumetric strain of ground.
引文
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[9]Tokyo Electric Power Company.Ground deformation in Kashiwazakikariwa nuclear power plant due to Tyuetsuoki eqrthquake[R].2008.(in Japanese).
[2]KAWASAMI H.General report on the Niigata earthquake of1964[M].Tokyo:Tokyo Electrical Engineering College Press,1968.
[3]SILVER M L,SEED H B.Volume changes in sands during cyclic loading[J].Journal of the Soil Mechanics and Foundations Division,ASCE,1971,97(9):1171-1182.
[4]LEE K L,ALBASISA A.Earthquake-induced settlements in saturated sands[J].Journal of the Soil Mechanics and Foundations Division,ASCE,1974,100(4):387-400.
[5]TATSUOKA F,SASAKI T,YAMADA S.Settlement in saturated sand induced by cyclic undrained simple shear[C].Proceeding of8th World Conference on Earthquake Engineering,San Francisco,California,1984:95-102.
[6]TOKIMATSU K,SEED H B.Evaluation of settlements in sands due to earthquake shaking[J].Journal of Geotechnical Engineering,ASCE,1986,113(8):864-878.
[7]ISHIHARA K,YOSHIMINE M.Evaluation of settlements in sand deposits following liquefaction during earthquake[J].Soils and Foundations,1992,32(1):173-188.
[8]Japan Road Association.Specifications for highway bridges,PartⅤAseismic Design[S].2002.(in Japanese).
[9]Tokyo Electric Power Company.Ground deformation in Kashiwazakikariwa nuclear power plant due to Tyuetsuoki eqrthquake[R].2008.(in Japanese).
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