Assessment of displacements of retaining walls and surrounding buildings when constructing a deep excavation in dense urban areas
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Abstract
A comparison of the results of geodetic monitoring of displacements of existing buildings and retaining wall structures and numerical simulation of the stress-strain state (SSS) of the system ‘soil - retaining walls - existing buildings’ during excavation in dense urban construction is presented.
Numerical simulation of the SSS system ‘soil - retaining walls - existing buildings’ was performed in a three-dimensional formulation, which makes it possible to correctly assess the system's SSS by taking into account the spatial stiffness of the structures.
It is shown that the direct use of soil parameters given in the report on engineering and geological surveys for numerical simulation of the SSS system ‘soil - retaining walls - existing buildings’ without their verification can lead to a significant 2-3.5 times higher error in determining the calculated values of displacements of structures and soils. Accordingly, there is a need to verify soil parameters.
The verification of soil parameters allows for good agreement between numerical simulation data and actual monitoring data.
A back analysis and verification of the soil model parameters were performed to ensure the convergence of the results of numerical simulation and field observations. It is recommended to refine the parameters of the soil model on the basis of laboratory studies of soil parameters in a wide range of loads/unloads using axial and triaxial soil compression.
An alternative method for verifying the design parameters of the soil model is to perform test pits to determine the actual values of retaining wall displacements and, based on the back analysis, refine the design parameters of the soil model to match the results of numerical simulation and actual measurements of structural displacements. The implementation of these recommendations makes it possible to bring the values of structural displacements predicted by numerical simulation closer to the actual values during construction work.
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References
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https://ojs.ukrlogos.in.ua/index.php/interconf/article/view/11725