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FREITAS, M. C. Evaluation of compacted lateritic columns as a soil improvement technique for collapsible soils. 2016. 200 f. Dissertação (Mestrado) – Escola de Engenharia de São Carlos, Universidade de São Paulo, São Carlos, 2016. The use of shallow foundation is limited on collapsible soils due to the collapse effect pronounced in superficial layers. Considering this scenario, this research presents a new soil reinforcement technique in order to reduce the settlement of foundations due to the collapse. The proposed technique involves the execution of compacted lateritic soil columns inserted into the collapsible soil. The compaction of these columns causes the densification of the surrounding soil and consequently reduces compressibility of the reinforced soil mass. In this work, it was also evaluated the effect of the hummer geometry on the radial compaction of the soil around the column. For this evaluation, laboratory tests were conducted using two different geometries of hammer, one conical and other cylindrical (traditionally used in foundation engineering). The results showed that the conical geometry provided greater lateral compaction of the soil around the column compared to the cylindrical geometry. The efficacy of the compacted lateritic soil columns was evaluated by the results of plate load tests performed on the collapsible soil of the Experimental Field of the University of São Paulo in São Carlos city. The tests were carried out on a plate installed in the ground with and without reinforcement. The gain on bearing capacity and settlement reductions due to the reinforcement were verified by using these tests results. The tests were performed in natural and in flooded condition to verify the efficiency of the soil reinforcement in the flooding situation. Based on the results of the plate load tests, it was verified the efficacy of the method to reduce the effect of collapse. The load-displacement curves of the load tests showed that the solution evaluated provided an increase of 400% on the ultimate capacity of the plate installed on the collapsible soil tested in this investigation.

Avaliação de técnica de melhoria de solos colapsíveis por meio de colunas de solo laterítico compactado