Your task is to construct a braced cut for a potential subway. The excavation ar
ID: 1866635 • Letter: Y
Question
Your task is to construct a braced cut for a potential subway. The excavation area that you will need to create is 25 feet deep and 50 feet wide. The excavated material is stiff sandy silt with a coefficient of permeability, K, of 3.5 x 10-6 m/sec. The unit weight of the soil is 98 pcf. The depth of the water table is at 20 feet. You may assume that the soil is uniform throughout the project. For this project determine the following:
1. Location and number of well points that are required.
2. Provide a drawing of your solution, both in plan and profile.
3. What will be the load on the sheeting for the excavation? You should determine the location of the centroid of the load on the back of the sheeting.
4. Design the sheeting. (You may wish to consult the OSHA regulations for assistance)
Explanation / Answer
The area of excavation = 25 x50 = 1250.
1. Since the soil is uniform over the area, 1 borehole can be taken to furnish the geo-technical report.The location will be at the centroid of the 50 feet x 50 feet.
2. Plan
3. Load on sheeting =
35 x 35 x 98 = 120.050 pcf
4.
Bore hole -Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.