Dynamic behavior of reinforced clayey sand under cyclic loading |
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| Affiliation: | 1. Isfahan Higher Education and Research Institute (IHEARI), Isfahan, Iran;2. Department of Civil Engineering, Islamic Azad University, Najafabad Branch, Isfahan, Iran;1. Department of Civil Engineering, National Chi-Nan University, University Road, Puli, Nantou 545, Taiwan;2. Department of Civil and Construction Engineering, National Taiwan University of Science and Technology, 43, Sec. 4, Keelung Road, Taipei 106, Taiwan;3. Department of Soil Mechanics and Foundations, University of Technical Education, Ho Chi Minh City, Viet Nam;1. Architecture and Civil Engineering College, Wenzhou University, Wenzhou, 325025, Zhejiang, China;2. Key Laboratory of Engineering and Technology for Soft Soil Foundation and Tideland Reclamation, Wenzhou University, Wenzhou, Zhejiang, 325035, China;3. Innovation Center of Tideland Reclamation and Ecological Protection, Wenzhou University, Wenzhou, Zhejiang, 325035, China;4. Department of Civil Engineering, Shanghai University, Shanghai, 200444, China;5. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, Zhejiang, 310012, China;1. Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, Shanghai 200092, China;2. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China;3. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu 610059, China;4. Department of Civil Engineering, Nagoya Institute of Technology, Showa-ku, Gokiso-cho, Nagoya 466-8555, Japan;5. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China;1. Department of Civil and Construction Engineering, Swinburne University of Technology, Melbourne, Australia;2. Department of Infrastructure Engineering, The University of Melbourne, Melbourne, Australia;3. School of Civil Engineering, and Center of Excellence in Innovation for Sustainable Infrastructure Development, Suranaree University of Technology, Nakhon Ratchasima, Thailand;4. Geofrontiers Group Pty Ltd., Melbourne, Australia |
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| Abstract: | Experimental investigations and modeling of linear elasticity of fiber-reinforced clayey sand under cyclic loading unloading are conducted in this paper. Experimental studies are focused on four aspects. First, a series of cyclic triaxial tests, with different confining pressures and deviator stress ratios up to 150 cycles, are performed. Impacts of fiber content, cell pressure, deviator stress ratio and loading unloading repetition that affect dynamic behavior of the composite material are discussed. It is shown that shear modulus decreases with increasing deviator stress ratio at high confining pressure and the rate of loss of shear modulus found to be much lower for fiber reinforced specimens. Other results show that increase of shear modulus with loading repetition is more pronounced at higher deviator stress ratios. Second, the optimum fiber content is experimented under cyclic loading unloading and is expressed as a power function of deviatoric stress ratio. It is shown that optimum fiber content is not constant and it is affected by deviator stress ratio. Third, a function is introduced to describe the linear stress–strain curve under cyclic loading unloading using equivalent linear analysis. The shear modulus G is expressed as a function of fiber content, confining pressure, deviatoric stress ratio and loading repetition. Finally constitutive coefficients of the model parameters are calibrated by the results of cyclic triaxial shear tests and using the linear regression. |
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| Keywords: | Reinforced clayey sand Fiber Cyclic triaxial test Shear modulus Optimum fiber content |
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