Post liquefaction residual strength of sand is an important parameter for the stability analysis and design of the liquefied soil layer In this study a K0 hollow cylinder apparatus was used to measure the post liquefaction residual strength of sandy soil Clean Ottawa sand specimens with different relative densities after consolidated and Mai-Liao sand (MLS) specimens with different fine contents were tested The water pluviation technique was used to prepare remolded specimens under the same effective consolidated stress All specimens were sheared using sinusodial shear stress to excited the excess pore water pressure ratio to reaches 1 0 and this state is defined as the initial liquefaction Following the initial liquefaction the specimens were then monotonically sheared at a constant strain rate of 2%/min to investigate the post liquefaction residual strength of sandy soil The results show that in the beginning of monotonic shearing the excess pore water pressure ratio maintained at 1 0 In the following stages of the monotonic shearing the excess pore water pressure ratio decreased with increasing shear strain Therefore this study defines the shear stress corresponding to the shear strain where the excess pore water pressure ratio begins to be less than 1 0 as the post liquefaction residual strength The results show that the post liquefaction residual strength is independent of initial relative densitieswith a residual strength ratio of 0 21 Furthermore the residual strength ratio of MLS will decrease from 0 26 to 0 21 as the fines content increase from 0 to 35%
Date of Award | 2020 |
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Original language | English |
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Supervisor | Wen-Jong Chang (Supervisor) |
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A Study on the Post-liquefaction Residual Strength of Sandy Soils using a Hollow Cylinder Apparatus
崇恩, 戴. (Author). 2020
Student thesis: Doctoral Thesis