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4. A 25-ft-diameter concrete caisson is to be sunk to the rock surface shown in Figure 5.17 at a depth of 50 ft. Describe, using sketches where appropriate, how you would do it, and what problems you might encounter. 5. A large (200-ft-square) structure is to be built on a downtown site where subsurface conditions are as shown in Figure 10.27. The structure founda- tions are to be placed on the surface of the dense sand. A 4-ft-deep gravel fill is then to be placed above the sand to support the basement floor. Streets and sidewalks surround the property. The structure walls proposed extend to within 5 ft of the sidewalk line. Propose a method for support- ing the excavation walls. Use sketches and justify your assumptions. Stiff clay 6. Repeat Problem 5, assuming that the structure is to be founded on the rock. Dense medium sand 40 Limestone 50 FIGURE 10.27 Soil profile for problem 5. Depth, feet

4. A 25-ft-diameter concrete caisson is to be sunk to the rock surface shown in Figure 5.17 at a depth of 50 ft. Describe, using sketches where appropriate, how you would do it, and what problems you might encounter. 5. A large (200-ft-square) structure is to be built on a downtown site where subsurface conditions are as shown in Figure 10.27. The structure founda- tions are to be placed on the surface of the dense sand. A 4-ft-deep gravel fill is then to be placed above the sand to support the basement floor. Streets and sidewalks surround the property. The structure walls proposed extend to within 5 ft of the sidewalk line. Propose a method for support- ing the excavation walls. Use sketches and justify your assumptions. Stiff clay 6. Repeat Problem 5, assuming that the structure is to be founded on the rock. Dense medium sand 40 Limestone 50 FIGURE 10.27 Soil profile for problem 5. Depth, feet

Fundamentals of Geotechnical Engineering (MindTap Course List)
Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter15: Retaining Walls, Braced Cuts, And Sheet Pile Walls
Section: Chapter Questions
Problem 15.24P
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4. A 25-ft-diameter concrete caisson is to be sunk to the rock surface shown in Figure 5.17 at a depth of 50 ft. Describe, using sketches where appropriate, how you would do it, and what problems you might encounter. 5. A large (200-ft-square) structure is to be built on a downtown site where subsurface conditions are as shown in Figure 10.27. The structure founda- tions are to be placed on the surface of the dense sand. A 4-ft-deep gravel fill is then to be placed above the sand to support the basement floor. Streets and sidewalks surround the property. The structure walls proposed extend to within 5 ft of the sidewalk line. Propose a method for support- ing the excavation walls. Use sketches and justify your assumptions. Stiff clay 6. Repeat Problem 5, assuming that the structure is to be founded on the rock. Dense medium sand 40 Limestone 50 FIGURE 10.27 Soil profile for problem 5. Depth, feet 26
Transcribed Image Text:4. A 25-ft-diameter concrete caisson is to be sunk to the rock surface shown in Figure 5.17 at a depth of 50 ft. Describe, using sketches where appropriate, how you would do it, and what problems you might encounter. 5. A large (200-ft-square) structure is to be built on a downtown site where subsurface conditions are as shown in Figure 10.27. The structure founda- tions are to be placed on the surface of the dense sand. A 4-ft-deep gravel fill is then to be placed above the sand to support the basement floor. Streets and sidewalks surround the property. The structure walls proposed extend to within 5 ft of the sidewalk line. Propose a method for support- ing the excavation walls. Use sketches and justify your assumptions. Stiff clay 6. Repeat Problem 5, assuming that the structure is to be founded on the rock. Dense medium sand 40 Limestone 50 FIGURE 10.27 Soil profile for problem 5. Depth, feet 26
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