Principles of Foundation Engineering (MindTap Course List)
8th Edition
ISBN: 9781305081550
Author: Braja M. Das
Publisher: Cengage Learning
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Chapter 2, Problem 2.17P
To determine
Find the time taken for 50% consolidation for a clay layer.
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A clay soil specimen, 1.5 in. thick (drained on top only) was tested in the laboratory. For a given load increment, the time for 60% consolidation was 8 min 10 sec. How long will it take for 50% consolidation for a similar clay layer in the field that is 10-ft thick and drained on both sides?
An odometer test is carried out on a sample of clay 20 mm thick assumed to be fully saturated.
The time to reach 90 percent consolidation is 10.5 min. Estimate the following: (a) Time to reach
50 percent consolidation in odometer test (b) Time for a 9-m-thick layer of this clay to reach 90
percent consolidation assuming the same drainage conditions apply and it is subject to the same
load increment as in the odometer test.
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?
Chapter 2 Solutions
Principles of Foundation Engineering (MindTap Course List)
Ch. 2 - Prob. 2.1PCh. 2 - Prob. 2.2PCh. 2 - Prob. 2.3PCh. 2 - Prob. 2.4PCh. 2 - Prob. 2.5PCh. 2 - Prob. 2.6PCh. 2 - Prob. 2.7PCh. 2 - Prob. 2.8PCh. 2 - Prob. 2.9PCh. 2 - Prob. 2.10P
Ch. 2 - Prob. 2.11PCh. 2 - Prob. 2.12PCh. 2 - Prob. 2.13PCh. 2 - Prob. 2.14PCh. 2 - Prob. 2.15PCh. 2 - For a normally consolidated soil, the following is...Ch. 2 - Prob. 2.17PCh. 2 - Prob. 2.18PCh. 2 - Prob. 2.19PCh. 2 - Prob. 2.20PCh. 2 - Prob. 2.21PCh. 2 - Prob. 2.22PCh. 2 - Prob. 2.23PCh. 2 - Prob. 2.24PCh. 2 - Prob. 2.25PCh. 2 - Prob. 2.26PCh. 2 - Prob. 2.27P
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- THE FIGURE SHOWS A SOIL FORMATION OF 5M SAND AND 6M CLAY. THE GROUNDWATER TABLE IS 4M BELOW THE GROUND SURFACE. IF A FILL WITH A UNIT WEIGHT OF 17KN/M3 AND A HEIGHT 2M IS PLACED ON THE GROUND, FIND: A. THE PRIMARY CONSOLIDATION SETTLEMENT OF THE CLAY LAYER IF IT IS NORMALLY CONSOLIDATED WITH A COMPRESSION INDEX OF 0.38 AND A VOID RATIO OF 1.52.B. THE TOTAL CONSOLIDATION SETTLEMENT OF THE CLAY 5 YEARS AFTER THE COMPLETION OF PRIMARY CONSOLIDATION SETTLEMENT. TIME FOR COMPLETION OF PRIMARY SETTLEMENT IS 2 YEARS. SECONDARY COMPRESSION INDEX IS 0.02arrow_forwardA clay specimen with an initial height of 22 mm has been tested in an oedometer in the lab, allowing double-way drainage to occur. The clay specimen reached 80% of final consolidation after 25 min. How long would it take in days for the same clay with a thickness of 8 m in the field to reach 80% of its final consolidation if there are three permeable levels of sand, one sand layer overlying the clay, a second thin sand layer in the middle of the clay, and a third sand layer immediately below the clay? (Acceptable tolerance = 2%)arrow_forwardHow long will it take (in days) for a 3-foot clay layer in the field (double drained) to reach 60% consolidation? The coefficient of consolidation for the clay is 2.5 X 10-6 m2/min.arrow_forward
- A 20 mm-thick sample in a singly drained laboratory consolidation test reaches 75% consolidation in 5 houres . How long will it take to reach 75% consolidation for a 5 m-thick clay sandwiched between two sand layers in the field ?arrow_forward13. Situation 13 - The soil is acted upon by a uniformly distributed load ΔP = 60 kPa at the ground surface. a. Compute the settlement of the clay layer, in mm, caused by primary consolidation if the preconsolidation pressure of clay is 230 kPa. Use Cs = Cc/5. Round off to the nearest whole number. b. Compute the settlement of the clay layer, in mm, caused by primary consolidation if the clay is normally consolidated. Round off to the nearest whole number. c. Compute the settlement of the clay layer, in mm, caused by primary consolidation if the preconsolidation pressure of clay is 200 kPa. Use Cs = Cc/5. Round off to the nearest whole number.arrow_forwardSubject: Soil Mechanics Please prove a solution and diagram A 2.5 cm thick sample of clay was taken from the field for predicting the time of settlement for a proposed building which exerts a uniform pressure of 100 kN/m2 over the clay stratum. The sample was loaded to 100 kN/m2 and proper drainage was allowed from top and bottom. It was seen that 50 percent of the total settlement occurred in 3 minutes. Find the time in days required for 50 percent of the total settlement of the building, if it is to be constructed on a 6 m thick layer of clay which extends from the ground surface and is underlain by sand a. 120 b. 140 c. 130 d. 110arrow_forward
- A 3 m thick clay layer (single-drained) under surcharge loading underwent 60% primary consolidation in 30 days. Calculate the coefficient of consolidation for the clay. If the ultimate consolidation of 30 mm, calculate the settlement for 30 days.arrow_forwardA building is constructed on a site underlain by saturated clay, normally consolidated. The excess pore water pressures measured at the centre of the clay layer 6 months after construction are significantly lower than that anticipated by 1-D Terzaghi’s theory of consolidation. What could be the reasons for the observed underprediction in the excess pore water pressure dissipation? Select all options that applies. A.3-D flow of water within the soil B.The compression index assumed in design is incompatible with the soil conditions encountered in the field. C.The coefficient of consolidation assumed in design was over-estimated D.The coefficient of consolidation assumed in design was under-estimatedarrow_forwardA 3.2 m thick layer of saturated clay under a surcharge loading underwent 90% primary consolidation in 80 days with double drainage. 1.Determine the coefficient of consolidation for the pressure range. 2.For a 10 cm thick specimen of the said clay, how long will it take to undergo 90% consolidation in the laboratory for a similar pressure range?arrow_forward
- For a laboratory consolidation test on a clay specimen (drained on both sides) the following results were obtained: Thickness of clay soil= 25 mm; P_1 = 50 kPa; P_2 = 120 kPa; e_1 = 0.92; e_2 = 0.78; Time for 50% consolidation= 2.5 min. Tv = 0.197. Determine the coefficient of compressibility in m2/kN. a.2.56 x 10^-2 b.1.081 x 10^-3 c.1.23 x10 ^-5 d.1.31 x 10^-7arrow_forwardA laboratory sample of clay 2 cm thick took 15 min to attain 60 percent consolidation under a double drainage condition. What time (in days) will be required to attain the same degree of consolidation for a clay layer 3 m thick under the foundation of a building for a similar loading and drainage condition? a.17.15 b.119 c.234 d.564.3arrow_forwardA 3 m thick stratum (drained in two directions) of saturated Clay and under overburden, exhibited 90% primary consolidation in 75 days. Find the coefficient of consolidation of the clay for the pressure range. a) Take a 30 mm thick specimen, how long will it take for it to show 80% consolidation in the laboratory for a similar length of pressure, consider a two-way drain? b) If the specimen is 25 mm, time to reach 60% consolidation, with drainage in one direction?arrow_forward
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