(From Chapter 7) 6. A sample of normally consolidated clay was obtained by a Shelby tube sampler from the midheight of a normally consolidated clay layer (see Figure 7-34). A consolidation test was conducted on a portion of this sample, the results of which are given as follows: FIGURE 7-34 Water Table 9 ft. square Sand and Gravel Unit Weight = 120 lb/ft³ Normally Consolidated Clay Unit Weight= 103 lb/ft³ Gravel and Sand Unit Weight = 125 lb/ft3 4.00 8.00 16.00 p (tons/ft²) 0.250 0.500 1.00 2.00 e Elevation 100 ft 1. Natural (initial) void ratio of the clay existing in the field (eo) = 1.80. 2. Pressure-void ratio relationships are as follows: 1.72 1.70 1.64 1.51 1.34 1.15 0.95 Elevation 94 ft Elevation 85 ft Elevation 76 ft A footing is to be constructed 6 ft below ground surface, as shown in Figure 7-34. The base of the footing is 9 ft by 9 ft, and it carries a total load of 200 tons, which includes the column load, weight of footing, and weight of soil surcharge on the footing. a. From consolidation test results, prepare an e-log p curve and construct a field consolidation line, assuming that point f is located at 0.4%. b. Compute the total expected primary consolidation settlement of the com- pressible clay layer.
(From Chapter 7) 6. A sample of normally consolidated clay was obtained by a Shelby tube sampler from the midheight of a normally consolidated clay layer (see Figure 7-34). A consolidation test was conducted on a portion of this sample, the results of which are given as follows: FIGURE 7-34 Water Table 9 ft. square Sand and Gravel Unit Weight = 120 lb/ft³ Normally Consolidated Clay Unit Weight= 103 lb/ft³ Gravel and Sand Unit Weight = 125 lb/ft3 4.00 8.00 16.00 p (tons/ft²) 0.250 0.500 1.00 2.00 e Elevation 100 ft 1. Natural (initial) void ratio of the clay existing in the field (eo) = 1.80. 2. Pressure-void ratio relationships are as follows: 1.72 1.70 1.64 1.51 1.34 1.15 0.95 Elevation 94 ft Elevation 85 ft Elevation 76 ft A footing is to be constructed 6 ft below ground surface, as shown in Figure 7-34. The base of the footing is 9 ft by 9 ft, and it carries a total load of 200 tons, which includes the column load, weight of footing, and weight of soil surcharge on the footing. a. From consolidation test results, prepare an e-log p curve and construct a field consolidation line, assuming that point f is located at 0.4%. b. Compute the total expected primary consolidation settlement of the com- pressible clay layer.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:(From Chapter 7)
6. A sample of normally consolidated clay was obtained by a Shelby tube sampler from the
midheight of a normally consolidated clay layer (see Figure 7-34). A consolidation test was
conducted on a portion of this sample, the results of which are given as follows:
FIGURE 7-34
Water Table
9 ft. square
Sand and Gravel
Unit Weight = 120 lb/ft³
Normally Consolidated Clay
Unit Weight = 103 lb/ft³
Gravel and Sand
Unit Weight = 125 lb/ft³
p (tons/ft²)
0.250
0.500
1.00
2.00
4.00
8.00
16.00
e
Elevation 100 ft
1.72
1.70
1.64
1.51
1.34
1.15
0.95
Elevation 94 ft
1. Natural (initial) void ratio of the clay existing in the field (eo) = 1.80.
2. Pressure-void ratio relationships are as follows:
Elevation 85 ft
Elevation 76 ft
A footing is to be constructed 6 ft below ground surface, as shown in
Figure 7-34. The base of the footing is 9 ft by 9 ft, and it carries a total load of
200 tons, which includes the column load, weight of footing, and weight of
soil surcharge on the footing.
a. From consolidation test results, prepare an e-log p curve and construct a
field consolidation line, assuming that point f is located at 0.4%.
b. Compute the total expected primary consolidation settlement of the com-
pressible clay layer.
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