Question: What analysis methods do you include in DeepEX software?
DeepEX software offers a comprehensive suite of analysis methods for evaluating deep excavations, catering to diverse engineering needs. The versatility of the software lies in its inclusion of three fundamental methods: the conventional Limit Equilibrium Method (LEM), the Non-linear Analysis method with elastoplastic Winkler springs (NL), and the Finite Element Analysis method (2D and 3D FEM). This unique feature empowers users to assess deep excavation models using various recognized approaches, effectively addressing and surmounting potential method limitations.
Fig.: Analysis method selection in DeepEX model wizard
- Limit Equilibrium Method (LEM)
In the LEM, walls undergo analysis independently. The software meticulously computes soil, water, seismic, and external surcharge diagrams on the wall through multiple implemented methods. It performs a comprehensive beam analysis, calculating applied moment, shear, and displacement diagrams, along with determining support reactions. Notably, the fixed supports and independent stages make it particularly suitable for scenarios involving multiple supports, although resulting deflections may not precisely represent complex cases.
Fig.: Braced excavation – LEM analysis results in DeepEX
- Non-Linear Elastoplastic Analysis (NL)
Utilizing an elastoplastic analysis approach with Winkler springs on active and passive sides, NL considers the initial geostatic stage with no excavation. Displacements, wall bending moments, and other parameters depend on construction staging, soil characteristics, and support elasticity.
- Combination Method (LEM+NL)
This method combines the strength of both LEM and NL. Initially, walls are analyzed using the limit-equilibrium approach, and wall embedment safety factors are stored. Subsequently, an elastoplastic analysis is conducted, yielding comprehensive results such as wall moments, deflections, shear force diagrams, and support reactions.
Fig.: Braced excavation – Non-Linear analysis results in DeepEX
- Finite Element Analysis (FEM)
DeepEX's optional Finite Element Analysis (FEM) module provides an advanced capability to perform FEM analysis on any model within the software. This analysis considers all construction stage effects and facilitates the modeling of full soil-structure interaction. The software employs 6-node triangular finite elements with quadratic shape functions to simulate soil, handling all stiffness calculations and aiding in the estimation of FEM analysis parameters.
Fig.: Braced excavation – 2D FEM analysis results in DeepEX
Fig.: Braced excavation – 3D FEM analysis results in DeepEX
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