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Consolidation of a Double-Layered Compressible Foundation Partially Penetrated by Deep Mixed Columns |
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| Authors: | Linchang Miao Xinhui Wang Edward Kavazanjian Jr |
| Affiliation: | 1Professor, Institute of Geotechnical Engineering, Southeast Univ., Nanjing 210096, PRC. E-mail: lc.miao@seu.edu.cn; lc.miao@jlonline.com 2Lecturer, Institute of Transportation Plan and Design, Southeast Univ., Nanjing 210096, PRC. E-mail: xinhui_wang@163.com 3Associate Professor, Dept. of Civil and Geoenvironmental Engineering, Arizona State Univ., Tempe, AZ 58287. E-mail: edkavy@asu.edu |
| Abstract: | Deep mixed columns often penetrate partially into the soft soil as floating columns due to the depth of the end-bearing layer. Partially penetrated soft soil by columns and the underlying compressible soft soil create a double-layered compressible foundation. So far, no reasonable solution is available to estimate the consolidation of such a double-layered foundation. This paper proposes an analytical solution for consolidation of a double-layered compressible foundation partially penetrated by deep mixed columns considering one-side or two-side vertical drainage The Laplace transform method was used to solve the consolidation equation for the double-layered system while Stehfest’s algorithm was used to solve the inverse Laplace transform for time-dependent loading. A consolidation algorithm was used to calculate the time-settlement relationship of an embankment constructed upon the double-layered foundation partially penetrated by deep mixed columns. The calculated settlements were compared well with field measurements. |
| Keywords: | Consolidation Foundations Clays Columns Soft soils |