Reference no: EM132223689

Simulate a Fixed-ring consolidation test on a clay sample for both loading and unloading stages using Geostudio Sigma/W package. Assume the following.

Sample diameter: 75 mm
Sample Height: 20 mm
Bulk Unit weight of the sample: 19 kN/m³
Cohesion: 40 kPa
Internal Friction angle: 24°
Dilation angle: 0°
Module of Elasticity (E): 10 MPa
Poisson Ratio: 0.334
Permeability in the saturated condition: 1E-12 m/sec
Loading stages: Day 1: 12.5 kPa, Day 2: 25, Day 3: 50 kPa, Day 4: 100 kPa, Day 5:
200 kPa
Unloading stages: Day 6: 100 kPa. Day 7: 50 kPa, Day 8: 25 kPa

If you require more parameters, assume a reasonable value and state it in your solution.

Hints:

• Use a material category of Effective Parameters with PWP change for the consolidation test;

• Use Elastic-Plastic (PWP change) Material model to simulate the clay;

• Define a step loading boundary function to apply the surface loading;

• Assume an isotropic clay

• Create one analysis for each day and set the new analysis as a child of the previous analysis; and

• Please note that the water table is always at the top of the sample.

Use the following hydraulic conductivity and volumetric water content functions:

Tasks

Model the above problem using Geostudio 2018 prepare a report with the following components:

a) Model Geometry

b) Model Materials

c) Boundary conditions and analysis type

d) The shape of the deformed sample

e) Draw a graph of the displacement of the top centre of the sample with time (day)

f) Draw a graph of the excess pore-water pressure at the mid-layer centre of the sample over time (day).

g) Draw a graph of the effective stress at the mid-layer centre of the sample over time (day).

The report must be submitted in the current MS Word file including the answers to the above questions.

You should also upload your Geostudio into a Google drive and add the link to the report.