Abstract
Currently many multi-populated Russian cities have an acute shortage of usable space in the central part. The superstructure of one or several floors can become a solution, but it entails a danger of overloading the foundations and the occurrence of uneven precipitation. In this connection, the authors proposed a new model for strengthening the foundations of reconstructed buildings: short piles are pressed or stuffed in local areas, the pile heads are tied with a grillage with the existing foundation. The article discusses the practical and theoretical solution of this problem. Two design models were produced on a 1: 5 scale: a strip foundation model and a strip foundation model locally strengthening with short piles. The experimental results are obtained. A sand base was also calculated using the finite element method by PC PLAXIS. The calculated and experimental data have sufficient convergence of the results. Based on the calculation and experiment, it was found that the draft of the strengthening foundation is 1.875 times less than the draft of the strip foundation, which proves the effectiveness of this method of strengthening with an increase in the load on the foundation by 1.5-2 times.
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