Shearing Behavior of Saturated Sand after Liquefaction
|Keywords:||動力三軸試驗;初始液化;剪力阻抗回升剪應變;回升剪力模數;dynamic triaxial test;initial liquefaction;shear resistance recovery shear strain;recovery shear modulus;fines content||Issue Date:||2009||Abstract:||
This research used Maoluo soil which had been liquefied during the Chi-Chi earthquake to study its behavior under shearing after initial liquefaction. The experiment used coarse portion（>No. 200）of the Maoluo soil to make specimens with relative densities of 40%, 60% and 70%. Specimens with a dry density of 1400 kg/m3 and fines contents of 10%, 20% and 40% were also tested. According to test results of the coarse-grained soil, we found that the specimen with a higher relative density can recover its shear resistance at a smaller shear strain after liquefaction and can obtain a higher recovery shear modulus. For soil with fines contents lower than 20%, the specimen with a higher fines content can recover its shear resistance at a smaller shear strain and a higher recovery shear modulus. On the other hand, for fines contents higher than 20%, the specimen with a higher fines content recovers its shear resistance at a higher shear strain. Comparing with the static modulus which is usually used in design the coarse-grained soil with a higher relative density can recover a higher percentage of the original design shear modulus after liquefaction. Similarly, for fines contents of 10%~20%, the soil with a higher fines content can recover a higher percentage of the design shear modulus after liquefaction. For fines contents above 20%, the soil with a higher fines content can recover a less percentage of the original design shear modulus.
|Appears in Collections:||土木工程學系|
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