Geotechnical analytical models are made for presenting the stress, deformation analysis, and settlement of the soil. The soil must be modeled in an advanced manner in order for the structural failure mechanisms to be observed. In this post, I am going to write about a research paper I found on the research gate that acknowledges and explains a model created using numerical analysis for geotechnical problem determination for the Abu Serga Church in Cairo, Egypt. Numerical and experimental analysis is used to characterize stress-strain analysis and subsoil deformation of the soft clay underneath the church.  |
| Abu Serga Church |
The subsoil is composed of plastic silty clay layers mixed with fine to medium sand layers and the groundwater table is at 1.8 m depth. The geotechnical properties are summarized in the table given below;
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| Geotechnical Characterization of the soil layers underneath the Abu Serga Church |
Church has a flood problem before a dam was constructed on the Nile River in 1971. But the floods caused loading and unloading of the subsoil for hundreds of years. the vertical effective stresses in the clay soil and its bearing capacity also changed with the rising and falling water table. Along with this problem, many cracks were observed on the superstructure of the church, because of the soil settlement and foundations movements undergoing a shear failure. A 3-dimensional model is implemented to analyze long-term creep deformations. To analyze the consolidation, a numerical model is produced based on assumptions, conditions, and simplifications. The main goal here is to find a suitable method for strengthening.
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| Differential vertical displacement patterns in the bearing silty clay soil. |
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3D Finite Element discretization of the PLAXIS model and deformed generated mesh.
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