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RISS 인기검색어
- 검색키워드
- 저자 : ( Yunming Yang ) (검색결과 2 건)
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Principal Stress Rotation under Bidirectional Simple Shear Loadings
Yao Li,Yunming Yang,Hai-Sui Yu,Gethin Roberts 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.5
Previous researches have indicated the non-coaxiality of sand in unidirectional simple shear tests, in which the direction of theprincipal axes of stresses does not coincide with the corresponding principal axes of strain rate tensors. Due to the limitation ofapparatus that most of testing facilities can only add shear stress in one direction, the influence of stress history on the noncoaxialityof sand is not fully considered in previous tests. In this study, the effect of stress history on the non-coaxiality of sand is systematicallystudied by using the first commercially available Variable Direction Dynamic Cyclic Simple Shear system (VDDCSS). Samples ofLeighton Buzzard sand (Fraction B) are first consolidated under a vertical confining stress and consolidation shear stress, and thensheared by a drained monotonic shear stress. Angle (θ) between the consolidation shear stress and the drained monotonic shear stressis varied from 0o to 180o, with an interval of 30o. The change of principal axes of stresses is predicted by well-established equations,and the principal axe of strain rate is calculated using recorded data. Results show that the level of non-coaxiality is increased by theincreasing θ, especially at the initial stage of drained shearing.
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Liquefaction of Granular Material under Multi-directional Cyclic Loading
( Hanwen Zhang ),( Yunming Yang ),( Hai-sui Yu ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Liquefaction of soil is one of the major contributor of construction damages caused by earthquake, which contains complicated loading directions and magnitudes. To investigate the liquefaction behavior of granular material during complex earthquake loading, a series of strain-controlled multi-directional cyclic simple shear tests are conducted on uniform-sized glass beads. The imposed cyclic loading includes circular and Figure-8 shape paths. Conventional uni-directional cyclic shearing path has also been conducted for comparison. After liquefaction initiates, the samples are reconsolidated and subjected to monotonic simple shearing to investigate their post-cyclic behavior. The test results indicate that samples subjected to multi-directional cyclic shearing are more prone to liquefy comparing with the conventional cyclic path. Moreover, a linear correlation between the cycle number for liquefaction and the cyclic strain amplitude is postulated for soils under various cyclic shearing conditions (e.g., vertical confining stress, relative density, and cyclic shearing path). In the light of these results, the cyclic shear strain amplitude and the cyclic path have significant influences on the specimen cyclic liquefaction resistance and the post-cyclic monotonic shear strength.
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