Validation of the Improved Soil Base Model for the Simulation of Multi-Section Buildings on Pile Foundations
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Abstract
In the construction industry, large-scale slab and pile-raft foundations are used for the construction of multi-storey buildings and structures with significant loads on a non-rocky soil foundation. One of the main trends in the construction of residential complexes is the sectional nature of multi-storey buildings. The purpose of this article is to test an advanced soil foundation model in the form of a continuous "stepped" layer with finite load distribution capacity and its parameters based on the comparison of numerical calculation results and observations of settlements in a three-section multi-storey building on pile-raft foundations during construction.
In the preparatory stage of the research, a corresponding finite element model of the "soil foundation – single pile" system was created to verify the interaction behavior of a single pile with the soil foundation. The maximum settlement values of the model piles obtained from numerical calculations were compared with the results of field tests of piles, confirming the consistency of the calculated values.
Modeling and calculation of pile-raft foundations of the three-section multi-storey building, with consideration for the different number of floors in the sections during construction in the "foundation – foundations – structures" system interacting with the improved soil foundation model in the form of a continuous "stepped" layer with finite load distribution capacity, were carried out. The calculated values were compared with the results of long-term field observations of settlements in each building section during construction. To identify the impact of the sequence of building construction with respect to sectional division, the distribution of calculation reactions at the pile heads of one section was analyzed. The results of the study confirmed the applicability of the improved soil foundation model for predicting deformations in multi-storey sectional buildings on large-scale pile-raft foundations with structurally stable dispersed soils beneath them. The results of numerical studies show that considering different compressible layers in the foundation model under various loadings, combined with an increased deformation modulus proposed by Professor O.V. Samorodov, allows for the most accurate modeling of settlement in each section of the three-section building.
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