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The paper refers to a national road sector approximately 5km long that was built on a swamp area. The general slope of the adjacent ground surface lead to the formation of a small concave area where the rainwater gathers and floods both the 1.5-2.0m tall embankment base and subgrade. Thus, due to the field geomorphology, which had not been properly taken into account within the frame of the geotechnical report, during the rainy seasons of the year, autumn especially, the level of the underground water table may rise to a depth of 1.60÷2.00m, very close to the natural ground level. In order to choose and dimension the measures for increasing the subgrade bearing capacity, in the laboratory were performed tests on samples prepared from reduced scale model. From the very beginning risen the solution of micro piles made of a lime, cement and sand mixture. The micro piles fulfilled a double purpose: on one hand they accelerated the primary consolidation process and on the other hand they lead to the improvement of the structured clay physical and mechanical properties. In the paper are presented the laboratory test results both on natural soil and treated one. The parameters obtained from laboratory were used in the model of foundation ground vertical and radial consolidation.
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