# Dynamic Study of Soil Parameters

For any foundation work it is very much necessary to study the mechanical parameter of soil before the concreting starts. To study the parameters on the deep foundation works,

first any site with the deep foundational pit is taken as reference example and orthogonal test method, finite difference method, and BP neural network method are used synthetically to determine the data.

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The project will conduct overall inversion for the soil mechanics parameters of each layer by means of layer-by-layer inversion, which reduces the interference of interaction between layers on back analysis research, avoid the difficulty that multi-layer soil parameters conduct back analysis research at the same, and greatly improve the efficiency of back analysis. In a layer-by-layer inversion, select the displacements at different depths of the underground continuous wall for back analysis research, which gives consideration to the verification of upper soil parameters and ensure the correctness of soil mechanics parameter in layer-by-layer inversion

## Project Description:

Foundation pit at any place is taken as the study object if the pit taken is in the sub-station that can be best because the load coming from the above ground will also be studied and if not it is feasible to take any deep pit. The foundation work construction excavates the earthwork by section and layer, and open cut method is used for construction. Foundation pit excavated in a layer and the elevation of each layer is noted down.

Numerical simulation computation model: FLAC3D software is used to establish a 3-D numerical model for the deep pit of the taken example problem. Supporting structure, the additional load on the ground, excavation of foundation and boundary conditions are fixed.

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## Project Implementation:

The implementation of this project starts with following simple steps:

1. Computational domain range like depth, width and length, analog unit like 8 node solid unit for soil and steel uses 3 node unit for simulation is used.
2. Boundary Constraints like X=0 or X= 110 in the long side direction of pit and Y=0 or Y=100 in the short side direction and Z directions are fixed.
3. Materials Models like Isotropic models are used in the software.
4. Initial calculation parameters are divided like the layers are summed up in 3 or 4 layers.
5. BP Network learning sample -The soil parameters like Elastic Modulus , Poisson ratio, Internal Friction and angle of internal friction are simulated for different layers in software.
6. Displacement of filling the layers back analysis is also run. It includes the silt layer analysis and clay layer analysis.
7. Internal forces analysis and analysis of soil & support structure are run.
8. BP neural network can determine the non-linear relationship between underground pit wall and soil mechanics parameter and this makes it advantageous over other.

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###### Dynamic Study of Soil Parameters
Skyfi Labs Last Updated: 2021-05-28

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