Geotechnical Investigation Report - Water Reservoir - Geotechnical Engineering Assignment Help

Assignment Task:

Project Description:

A large water reservoir is going to be built in the U of Akron’s compus. This reservoir will be used for research purposes in the field of environmental and water resources engineering. This reservoir is a 16-feet deep pool consist of 6 walls. The location of this reservoir is presented in figure 1 (red-dashed zone). The contractor has requested a consuting geotechnical company to design a retainning wall to support the excavations.

You are the geotechnical engineer who is working in this consulting company. You have been asked to design the retaining wall located on NW1 wall of the reservoir. The length of the north-wall 1 (NW1) is 130 ft. Your main tasks has been defined as:

- Review the geotechnical investigation report and extract all the soil properties that are needed for designing the retaiting wall
- Two types of retaining wall must be considered: 1) a cantilever wall 2) a gravity wall
- For each type of retaining wall propose an initial dimensions (proportioning)
- Based on the porposed dimensions, design each type of reatining wall against overturning, sliding, and bearing capacity
- If the porposed dimensions are not satisfied, modify the dimensions and repeat the previous step until the proposed wall meet all the safety requirements. If the proposed dimensions are appeared to be larger than what is needed, reduce the dimension tos lower the final cost of the project.
- Report the final design (dimesions) of the two types of retaining wall. For each type also report the final cost required to build NW1 retaining wall. For this case, assume the cost of concrete is $160 per cubic feet (including the material, delivery, labor and construction cost)
- Based on the final cost of the two types, make your final suggestions (which type must be applied)

From the senior geotechnical engineer:

Design requirements:
- No surcharge on the surface
- No slope on the backfill
- The depth of retaining wall (D) is 4 ft. This makes the entire height of retaining wall equal to 20 feet (from the top stem to the bottom base).
- The friction and adhesion between the retaining wall and soil must be included in the calculations. If no value of wall friction and adhesion is reported in the geotechnical investigation report, make your own appropriate assumptions.
- You can either use Rankine or Coulomb’s theory
- The impact of ground water table must be considered for the backfill side (active pressure), but no need to count for ground water table in front of the wall (for the passive side).
- The retaining wall must be design for an empty reservoir (because in a full reservoir, the water pressure inside the pool will increase the safety of retaining wall)
- 1 ft of additional water table must be added to the GWT measured in the boring logs. The reason is that all the borings were performed during the dry season. 1 ft of additional water table is required to account for precipitations and runoffs.
- Start your initial design from the smallest dimensions, and increase them later as needed

Preparing the report:
The final report must be typed in MS word and have the following items and sections:

Cover letter 
Table of contents

1. Review of Geotechnical Investigation Report
(including the correlations between SPT and soil properties). In this section, the soil properties including the angle of friction, cohesion, unit weight and water table must be extracted and interpreted from the Geotech investigation report. The final interpreted properties must be reported in a table.

2. Cantilever wall
2.1. Initial proportioning (dimensions)
2.2. Check for overturning, sliding and bearing capacity
2.3. Adjusting the dimensions
2.4. Recheck for overturning, sliding and bearing capacity
2.5. Report the final design and cost

3. Gravity wall
3.1. Initial proportioning (dimensions)
3.2. Check for overturning, sliding and bearing capacity
3.3. Adjusting the dimensions
3.4. Recheck for overturning, sliding and bearing capacity
3.5. Report the final design and cost

4. Final suggested design (suggestions based on total cost of NW1 retaining walls)

Appendix 
Geotechnical Investigation Report

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