H= Co settlement occurred in the first of 5 minutes, for the same consolidation of drainage, how long is required for A consolidation test on sample of clay of 2.4 cm thick indicate that half of the ultimate consolidation U=30 building on 8 m layer of same clay to experience half and 30% of consolidation.

H= Co settlement occurred in the first of 5 minutes, for the same consolidation of drainage, how long is required for A consolidation test on sample of clay of 2.4 cm thick indicate that half of the ultimate consolidation U=30 building on 8 m layer of same clay to experience half and 30% of consolidation.

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter9: Consolidation

Section: Chapter Questions

Problem 9.3P

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A 8ft clay layer reaches 100% consolidation in 13 years and has a natural water content of 75%, what is the secondary compression settlement in the soil if the building life is expected to be 45 years. Report your answer to three decimal places and in inches. Coefficient of Secondary Compression, Ca 0.04 0.03 0.02 0.01 Type your answer... wy 50 Average Ca for Completely Remolded Samples Falls in This Zone 100 150 200 Natural Water Content, % FIGURE 7-21 Coefficient of secondary compression; C = ratio of decrease in sample height to initial sample height for one cycle of time on a logarithmic scale following completion of primary consolidation. Source: U.S. Department of the Navy (1971). Range Undisturbed Samples: Ca in Range of Virgin Compression Cain Range of Recompression Lies Below This Upper Limit 250 300 350 400
3-lf the time needed for 50% consolidation of a 2-in clay specimen (single drainage) in the laboratory=2 min, how many days will it take for a 12-ft thick clay layer (with sand on top, and bottom) in the field to undergo 90% consolidation under the same pressure increment?
The results of a laboratory consolidation test on a clay sample are given below: Pressure, p (kN/m²) Void ratio, e 23.94 1.112 47.88 1.105 95.76 1.080 191.52 0.985 383.04 0.850 766.08 0.731 (43) a) Draw an e-log p plot. (44) b) Determine the pre-consolidation pressure, p. . (45) c) Find the compression index, Ce. Appendix For ø=35°, N¸=57.8, N,=41.4, and N,=41.1. o,'=0;'tan²| 45°+ +2c tan| 45°+
‹ample 9.1: Following results were recorded from a consolidation test on a specime turated clay, each load being maintained constant for 24 hours before the addition o ext increment.
ANSWER MUST BE: (a) t50 = 8.37 years, (b) t90 = 35.96 years, (c) U ≈ 17%, (d) U ≈ 39% A clay specimen was tested in a laboratory consolidation device, whichwas 12.7 mm (½ in.) thick and the top and the bottom boundaries weredrained. A 50% consolidation time on the specimen was obtained as28.4 minutes. Determine the following:(a) Time for 50% consolidation in the field with this soil with a 2.5 mthickness where only the top layer is drained (b) Time for 90% consolidation in the field with this soil with a 2.5 mthickness where only the top layer is drained (c) For the same field condition above, at the end of 1 year after theplacement of load, how much primary consolidation settlementoccurs relative to its final amount of the settlement? (d) The same question as in (c), but at the end of 5 years
How long will it take to achieve 50% consolidation for a 6ft clay layer in double drainage conditions? The coefficient of consolidation for the clay is 3.16 x 10^-3 in^2/min? Percent Primary Consolidation, U% 0 10 20 30 40 50 60 70 80 90 100 0 0.1 0.612 years 2.11 years 0.2 0.3 0.4 0.5 Time Factor, T FIGURE 7-17 Time factor as a function of percentage of consolidation (Teng, 1962). 0.6 0.7 U(%) 10 20 30 40 50 60 70 80 90 95 99 99.9 100 0.8 T, 0.0077 0.0314 0.0707 0.126 0.196 0.286 0.403 0.567 0.848 1.13 1.78 2.71 Infinity 0.9 1.0
The data in Table 1 shows the results from a consolidation test conducted on a specimen of clay. Table 1. Results from the consolidation test o'(kPa) e 50 100 200 400 800 400 200 100 200 400 800 1600 1.63 1.6 1.55 1.39 1.22 1.24 1.28 1.33 1.31 1.28 1.21 1.07 Draw the e-log o' graph. • Determine the compression index (Cr). a)Determine the recompression index (Cr).
Q: For the soil profile shown in figure. Find: a) Final consolidation settlement. b) Time required for 60% consolidation. c) Pore water pressure after 18 months. d) Piezometer reading above point (A) immediately after applying the load. Surcharge Aq.= 100 kPa Sand y=15kN/m’ 7kN/ m® Piezometer t AT ol g thefity i
A 6ft clay layer reaches 100% consolidation in 10 years and has a natural water content of 75%, what is the secondary compression settlement in the soil if the building life is expected to be 42 years. Report your answer to three decimal places and in inches. Coefficient of Secondary Compression, Ca 0.04 0.03 0.02 0.01 0 50 Type your answer... DIRTY 100 Average C for Completely Remolded Samples Falls in This Zone 150 200 Natural Water Content, % FIGURE 7-21 Coefficient of secondary compression; C = ratio of decrease in sample height to initial sample height for one cycle of time on a logarithmic scale following completion of primary consolidation. Source: U.S. Department of the Navy (1971). Range Undisturbed Samples: Ca in Range of Virgin Compression Ca in Range of Recompression Lies Below This Upper Limit 250 300 350 400
A 3-m thick layer of saturated clay (two-way drainage) under a surcharge loadingunderwent 90% primary consolidation in 100 days. The laboratory test’s specimenwill have two-way drainage.a. Find the coefficient of consolidation of clay for the pressure range. b. For a 25 mm. thick undisturbed clay specimen, how long will it take to under-go 80% consolidation in the laboratory for a similar pressure range?
A consolidated drained tri-axial test was conducted on a normally consolidated day. The results were as foHows: 03 = 300 kPa (confining pressure) Deviators stress = 300 kPa o Compute the angle of shearing resistance. e Compute the angle that the failure plane makes with the major principal. stress. Compute the shear stress on the failure plane.
A new building is planned upon the site shown below. Assume that the clay solids have a specific gravity of 2.67. Find the primary consolidation settlement if the clay is normally consolidated. 4p = 1 ksf Sand 8 feet y= 110 pcf, Water Table 7 feet Ysar = 115 pcf Clay 17 feet w = 34%, LL = 50%, ysar = 120 pcf