5. A large (200-ft-square) structure is to be built on a downtown site where subsurface condi- tions are as shown in Figure 10.23. The structure foundations are to be placed on the sur- face 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 pro- posed extend to within 5t of the sidewalk line. Propose a method for supporting the exca- vation walls. Use sketches and justify your assumptions. 6. Repeat Problem 5, assuming that the structure is to be founded on the rock. Stiff clay 26 Dense medium sand 40 Limestone Figure 10.23 Soil profile for Problem 5. 50 Depth, feet
5. A large (200-ft-square) structure is to be built on a downtown site where subsurface condi- tions are as shown in Figure 10.23. The structure foundations are to be placed on the sur- face 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 pro- posed extend to within 5t of the sidewalk line. Propose a method for supporting the exca- vation walls. Use sketches and justify your assumptions. 6. Repeat Problem 5, assuming that the structure is to be founded on the rock. Stiff clay 26 Dense medium sand 40 Limestone Figure 10.23 Soil profile for Problem 5. 50 Depth, feet
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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solve problem 6 in the image provided.
Transcribed Image Text:5. A large (200-ft-square) structure is to be built on a downtown site where subsurface condi-
tions are as shown in Figure 10.23. The structure foundations are to be placed on the sur-
face 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 pro-
posed extend to within 5t of the sidewalk line. Propose a method for supporting the exca-
vation walls. Use sketches and justify your assumptions.
6. Repeat Problem 5, assuming that the structure is to be founded on the rock.
Stiff clay
26
Dense medium sand
40
Limestone
Figure 10.23 Soil profile for
50
Problem 5.
Depth, feet
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