Geotechnical Design: Analysis and Simulation of Soil Mass

Geotechnical design 1
GEOTECHNICAL DESIGN
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Geotechnical design 2
Introduction
This study deals with the stresses and displacements in a soil mass due to the applied
loading. The analysis and simulation of this case is three dimension. For the case of two
dimensions, the normal stresses and shear stresses in the x and z directions, where the rate of
changes of the normal stresses are ∂ σ x /∂ x , ∂ σ z /∂ z and shear stressesare ∂ τ xz /θx and θ τ zx /θz
(Smith, 2014). By the equating moments about the axis. Due to the applied loading, the soil mass
will be displaced relative to the axes and to one another.
The ground initial conditions the soil is soft clay and underneath the plastic marl. The
water table is 6m below the datum. Granular fill is added and compacted to a depth of 1m. A
flexible steel base is placed in day 2 and the tank is welded on the next day. Then fill with water
up to 70% for the next 7 days.
The software used to perform the analysis and simulation should perform Finite Element
Analysis (FEA) and Numerical Analysis. In this case, the recommended one is Geostudio.
Geostudio is suitable to perform and simulate the geotechnical analysis. It performs the stress
deformation, initial state analysis, couple stress or the pore water Pressure, stress redistribution,
Volume change, seepage analysis, dynamic analysis, and slope stability analysis (Yamin, et al,
2017).
Objectives
 Determine and drawing the settlement diagram under the foundation.
 Determine and draw the changes in stresses
 Draw the excess pore water pressure diagram

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Literature Review
We are required to perform a stress-deformation in consideration of pore-water pressure
and without that is from the applied loads. The computation of these changes are below the
flexible foundation of a circular tank with water.
Deformation Analysis
For the purpose of deformation analysis in the Geostudio is perform by the SIGM/W. the
deformation can be due to foundations, embankments, excavations and tunnels (Barnes, 2016).
The case study is a water-filled tank on a flexible foundation on the ground surface.
The Excess pore-water pressures
The effect of couple stresses will be considered due to the fill placement and even in
some cases the applied loading (Chehade & Shahrour, 2008). For the slope stability
consideration, the excess pore-water pressures computations done by the SIGMA/W from the
import into SLOPE/W. the bilateral collaboration of SLOPE/W and SIGMA/W allows the slope
stability analysis and couple stresses to be performed with ease.
Stage construction
Most of the soil regions are constructed at different stages. The Geostudio provides a
feature that allows different stages to be processed over time in a single project file. This is
achieved by automatically linking multiple analyses together on a single continuum time.
Modeling in Geotechnical Engineering
In this field, numerical models are considered over the physical modeling since the setup
is quicker (Barnes, 2016) and (Paice, et al 1996). The modeling will provide information and

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results at any point within the cross-section and accommodate a wide variety of boundary
conditions. According to Professor Burland, he emphasized on the three fundamental
components of soil mechanics which are the ground profile, the soil behavior and modeling
(Indraratna, et al., 2015). The relations of these components are illustrated with the following
Figure 1: Soil mechanic triangle (Indraratna, et al., 2015)
The soil behavior component is gotten by performing laboratory test, in situ and field test.
The profile involves the site characterization while modeling may be conceptual, analytical and
simulation (Indraratna, et al 2015).
Methodology
The problem is a three-dimension, therefore being symmetric about a vertical axis the
analysis will be performed with a two-dimensional finite mesh.