The Influence of Previous CyclicLoading on Liquefaction Resistance and Shear Wave Velocity of Sand

• Main Authors: Chia-Hua Hsu, 許家華
• Other Authors: Y.C. Chen
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/34068837967514213751

碩士 === 國立臺灣科技大學 === 營建工程系 === 93 === The research of this experiment is to discover the influence of previous cyclic loading on liquefaction resistance and shear wave velocity incurred in the reconstituted specimens imposed with various previous cyclic loading, in view to study the relationship between liquefaction resistance and shear wave velocity under previous cyclic loading. The tools used for the experiment are bender element test and cyclic triaxial test which will show us how reconstituted specimens are influenced by previous cyclic loading in terms of liquefaction resistance and shear wave velocity.Based on Hsin-Dian sand, the reconstituted specimens is made and consolidated, then put under bender element test to acquire shear wave velocity, followed by cyclic triaxial test to obtain liquefaction resistance. The result shows,on the reconstituted specimens, the larger the shear wave velocity is, the higher the liquefaction resistance gets. Compare this result between the shear wave velocity and the liquefaction resistance from our experiement with those from other research results, it can be seen that under the same normalization shear wave velocity, the liquefaction resistance from this experiment falls between Andrus and Stokoe (2000) and Zhou et al.(2005). On the influence of previous cyclic loading , we can see liquefaction resistance increases when specimens is imposed with small previous cyclic loading, but decreases while previous cyclic stress ratio ( PCSR ) goes beyond 0.15. On the other hand, the previous cyclic loading does not show obvious impact on shear wave velocity which indicates it would take more thorough tests and experiments to be able to conclude the liquefaction resistance via shear wave velocity.