1- Find the final consolidation settlement 2- Having the final consolidation settlement of (20) cm, find the void ratio corresponding to 50% consolidation.
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- 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‹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.8. Plot the consolidation curve for the data given below and determine the preconsolidation stress (o'c). Note: tsf = tons per square foot. tsf e 0.25 0.93 0.5 0.92 0.9 2 0.88 4 0.84 1 8 0.75 16 0.59 32 0.38 4 0.43 1 0.48 9. For the plot in problem 8, determine Cr and Cc.
- Consolidation test results are provided below, (Hint: C, or C = Ae / log(of/ai') ): 1.2 1.1 1- 0.9 Void ratio 0.8 0.7 0.6 0.5 0.4 1 10 100 1000 Vertical stress (kPa) (log scale) In some of the results an interval is provided. It ccan be possible to get a result between the given values Use the plot and find pre-consolidation pressure (past maximum vertical effective stress) pe' according to Casagrande's method. pe'= .kPa Seç. Find C, Seç. Find C.: Seç. If the tested soil sample is taken at a depth of 5m (ysat=18kN/m) where the groundwater table is located at the surface what is the Over Consolidation Ratio(OCR) (OCR= pclo vo) Seç. Initial height of the specimen is 22mm. What is the final height of the specimen when effective vertical stress is 650kPa? Hint: Use void ratio. Seç. (Result is in mm) What is the consolidation settlement of 2m thick clay layer if initial effective stress is 20kPa and final effective stress is 400kPa. Hint: Poc= Seç. [Ho/(1+einit)]x[C,log(p'/o'init) +…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 1.0The 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).
- Suppose that you are a Project Engineer on a Dam project. The volume of soil required at the dame site is Vd=100,000m3. The final void ratio (ed) is 0.80. Your boss, the Project Manager delegates to you the important decision of buying the earth fill from one of three suppliers. • Supplier X sells fill at OMR. 0.200/m3 with e = 0.90• Supplier Y sells fill at OMR. 0.120/m3 with e = 2.00• Supplier Z sells fill at OMR. 0.150/m3 with e = 1.60Evaluate and select the best supplier based on your knowledge about soil compaction.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 400A layer of soft clay 4 m thick under construction building, the overburden pressure over the center of the clay layer is 300 kPa, Cc = 0.5, G = 2.7, w = 50%. Final consolidation settlement if the increase in pressure due to construction of 100 kPa Pease answer correct and fast but no wrong answer
- 9. 8.5m compacted fill is to be placed over the soil profile. Cosnolidation tests are done on samples from point A and point B and produce the following results. Compute the ultimate consolidation settlement due to the weight of this fill in INCHES. 2.0 m Cc 7.0 m 18.0 m Cr 8.5m eo o P1010101010- Sample A 0.25 0.08 0.66 101 kPa Proposed fill = 20.3 kN/m³ Y= 18.3 kN/m³, Y = 19.0 kN/m³ y=19.5 kN/m³ 10.0 Glacial till 4.0 Sample B 0,20 0.06 0.45 510 kPa B Stiff silty clay (CL) Very stiff clay (CL)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°+Q2: For the soil profile and loading condition shown in Fig. (2). Find: a) Final consolidation settlement. b) Time required for the settlement to be (42) mm. c) The settlement after 2 years. 2 m 3 m 8 m Surcharge Aq=100 kPa Sand y=19.5 kN/m³ Sand Ysat 21 kN/m³ Clay Ysat = 19 kN/m³ eo=0.85 C₁ = 0.04 p=200 kN/m² Ce=0.2 C₁ = 3.4 m²/yr Rock