Pre-shear effect on liquefaction resistance of a Fujian sand |
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| Institution: | 1. Department of Geotechnical Engineering, Tongji University, Siping Road 1239, Shanghai 200092, China;2. Department of Civil Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, Shanghai 200240, China;1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, PR China;2. College of Architecture and Civil Engineering, Wenzhou University, Wenzhou 325035, PR China;1. School of Civil Engineering, State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing, China;2. School of Civil Engineering, State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China;3. Ertan Hydropower Development Company Limited, Chengdu 610051, China;1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu 610059, China;3. Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200030, China;4. College of Surveying and Geo Informatics, Tongji University, Shanghai 200092, China |
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| Abstract: | Pre-shear history has been shown to be a critical factor in the liquefaction resistance of sand. By contrast to prior experimental studies in which triaxial shear tests were used to examine the effects of pre-shear on the liquefaction resistance of sand, hollow cylinder torsional shear tests were used in this study to avoid the influence of the inherent anisotropy that is inevitably produced during the sample preparation process because of gravitational deposition. A series of cyclic undrained shear tests were performed on sand samples that had experienced medium to large pre-shear loading. The test results showed that the liquefaction resistance of sand can be greatly reduced by its pre-shear history, and a pre-shear strain within the range from 0.1% to 5% can cause sand to be more prone to liquefaction. During the cyclic shear tests, the samples that had experienced pre-shear loading exhibited different behaviors when cyclic shear loading started in different directions, i.e., the clockwise direction and the counterclockwise direction. If the cyclic loading started in the identical direction as the pre-shear loading, then the mean effective stress of the sand was almost unchanged during the first half of the loading cycle; if the cyclic loading started in the direction opposite to that of the pre-shear loading, then the mean effective stress decreased significantly during the first half of the loading cycle. However, this anisotropic behavior was only remarkable during the first loading cycle. From the second cycle onward, the speeds of the decrease in the mean effective stresses in the two types of shear tests became similar. |
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| Keywords: | Pre-shear effect Liquefaction Hollow cylinder shear test Anisotropy |
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