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http://dx.doi.org/10.9720/kseg.2013.3.247

Settlement Characteristics of a Large-Scale Foundation over a Sabkha Layer Consisting of Carbonate Sand  

Kim, Seok-Ju (Department of Civil Engineering, Kumoh National Institute of Technology)
Han, Heui-Soo (Department of Civil Engineering, Kumoh National Institute of Technology)
Publication Information
The Journal of Engineering Geology / v.23, no.3, 2013 , pp. 247-256 More about this Journal
Abstract
The carbonate sands of the Sabkha layer in the Middle East have very low shear strength. Therefore, instant settlement and time-dependent secondary settlement occur when inner voids are exposed, as in the case of particle crushing. We analyzed settlement of the Sabkha layer under a large-scale foundation by hydrotesting, and compared the field test results with the results of laboratory tests. With ongoing particle crushing, we observed the following stress-strain behaviors: strain-hardening (Sabkha GL-1.5 m), strain-perfect (Sabkha GL-7.0 m), and strain-softening (Sabkha GL-7.5 m). General shear failure occurred most frequently in dense sand and firm ground. Although the stress-strain behavior of Sabkha layer carbonate sand that of strain-softening, the particle crushing strength was low compared with the strain-hardening and strain-perfect behaviors. The stress-strain behaviors differ between carbonate sand and quartz sand. If the relative density of quartz sand is increased, the shear strength is also increased. Continuous secondary compression settlement occurred during the hydrotests, after the dissipation of porewater pressure. Particle crushing strength is relatively low in the Sabkha layer and its stress-strain behavior is strain-softening or strain-perfect. The particle crushing effect is dominant factor affecting foundation settlement in the Sabkha layer.
Keywords
Sabkha; Particle crushing; Carbonate sand; Hydrotest; Triaxial test;
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