Cyclic swelling of clays |
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| Authors: | V.I. Osipov Nguen Ngok Bik N.A. Rumjantseva |
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| Affiliation: | 1. College of Resources and Environment, Yunnan Agricultural University, Kunming 650205, China;2. Institute of Agricultural Environment and Resources, Yunnan Academy of Agricultural Science, Kunming 650205, China;3. Key Laboratory of Mountain Surface Processes and Ecological Regulation, Chinese Academy of Sciences, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Resources, Chengdu 610041, China;1. Key Laboratory for RC and PRC Structures of the Ministry of Education, Southeast University,Nanjing 210096, China;2. School of Civil and Environmental Engineering, Nanyang Technological University, Block N1, Nanyang Ave, Singapore 639798, Singapore;3. Formerly School of Civil and Environmental Engineering, Nanyang Technological University, Block N1, Nanyang Ave, Singapore 639798, Singapore;1. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang 110004, China;2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;3. CSIRO Energy Flagship, Private Bag 10, Clayton South VIC 3169, Australia;1. School of Civil Engineering, Wuhan University, Wuhan, Hubei, China;2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of the Ministry of Education, Wuhan University, Wuhan, Hubei, China |
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| Abstract: | Changes in free swelling and swelling pressure of different types of clays in response to varying cycles of wetting and drying have been studied. It can be shown that cyclic tests lead to a gradual destruction of the durable contacts in the clay structure and their transformation into less durable ones. At the same time, a reconstruction of the structure of the clays takes place, manifested by the destruction of large micro-aggregates and by disorientation of structural elements. All these phenomena result in great swelling with increase in the number of wetting cycles. Between cycles 3 and 20 the expansibility is at its maximum and may be 1.3–10 times as much as that after one wetting cycle. Cyclic swelling leads to an overall equilibrium in the system, when the internal energy of the clay is minimal and the bound water content is at its maximum. Clay in this state exhibits its maximum moisture uptake (W′s), the meaning of which is of thermodynamic character and depends neither on the initial soil density and moisture, nor on the scheme of cyclic tests adopted. |
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