Abstract
The effects of carbon & sika fibers on the Undrained unconsolidated strength (UUS) of weak clay soil have been studied in this research. The soil sample obtained from Al Basra city south of that can be classified according to USCS as weak silty clay of low plasticity (CL). The additives are carbon & sika fibers. The soil samples were improved by mixing with four ratios of each additive 0.5, 1, 1.5 and 2% of the dry soil weight. Mixture samples prepared using the optimum water content. Bearing capacity of samples measured by the unconsolidation undrained tri-axial shear test. Based on the results of tests at failure, the undrained unconsolidated strength (UUS) increased with increasing the ratio of additives, except in the case of sika fiber, which gave negative effects. In addition, it is important to avoid using carbon fiber in a high ratio of upper than 1% of dry soil weight due to a decrease in the (UUS).
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