Laboratory Validation of Ultra-Soft Soil Deformation Model |
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Authors: | Myint Win Bo Victor Choa Kai Sin Wong Arul Arulrajah |
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Affiliation: | (1) DST Consulting Engineers Inc, 605 Hewitson Street, Thunder Bay, ON, P7B5V5, Canada;(2) Nanyang Technological University, Nanyang Avenue, Singapore, 639798, Singapore;(3) Swinburne University of Technology, PO Box 218, Hawthorn, VIC, 3122, Australia |
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Abstract: | Ultra-soft soil with high moisture content will experience large strain deformation under one-dimensional compression with little or no gain in effective stress. Such deformation behaviour does not comply with Terzaghi’s effective stress gain theory. The e-log sv¢ sigma_{v}^{prime } relationship of ultra-soft soil is non-linear with large compression index in the first order of log cycle. This paper proposes three compression indices (Cc1* C_{c1}^{*} , Cc2* C_{c2}^{*} and Cc3* C_{c3}^{*} ) for stresses covering three log cycles. Good prediction of settlement magnitude is possible with these newly proposed compression parameters for ultra-soft soil. In addition, implicit finite difference model applying the large strain theory is also proposed and validated with results from laboratory measurements. The time factor curves for ultra-soft soil with large strain compression are also proposed and validated. |
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