Question 2 An oedometer (consolidation) test was performed on a clay sample 3 cm high, drained on both sides, and taken from mid-stratum shown below. Seventy percent consolidation was attained in 6.67 minutes. Find: (b) The time required to attain 70% consolidation of the clay stratum. (c) The magnitude of that settlement in that time. 4m Sand Surcharge 2m Sand Y = 18 kN/m² WT

Question 2 An oedometer (consolidation) test was performed on a clay sample 3 cm high, drained on both sides, and taken from mid-stratum shown below. Seventy percent consolidation was attained in 6.67 minutes. Find: (b) The time required to attain 70% consolidation of the clay stratum. (c) The magnitude of that settlement in that time. 4m Sand Surcharge 2m Sand Y = 18 kN/m² WT

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 9.7P

See similar textbooks

Similar questions

An oedometer test is performed on a 2 cm thick clay sample. After 5 minutes, 50% consolidation is reached. After how long a time in no. of days would the same degree of consolidation be achieved in the field where the clay layer is 3.70 m thick? Assume the sample and the clay layer have the same drainage boundary conditions (double drainage). a.17.15 b.234 c.564.3 d.119 With Free Body Diagram
A large oil storage tank 90 meters in diameter is to be constructed on the soil profile shown in the figure below. The average depth of the oil in the tank is 18 meters, and the specific gravity of the oil is 0.92. Consolidation test showed that the clay is normally consolidated with Ccε = 0.154, Crε = 0.0112, and σ'p = 260 kPa. Estimate the total consolidation settlement of the tank. Neglect any settlements in the sand (ρd,sand = 1.71 Mg / m3). Perform this estimation by: a. Assuming conditions at the mid-depth of the clay are typical of the entire clay layer. b. Dividing the clay layer into four thinner layers with a thickness of 5 meters each, computing the settlement of each thin layer, and summing up using the included equation for sc. Assume that σ'p = σ'vo when σ'vo > σ'p. Hint: the load applied by the tank is given by qo = ϒoilhoil
A site has 20 m of saturated clay (saturated density = 1.6 Mg/m3) over hard bedrock. The settlement analysis for the clay under a new structure forecast that the ultimate consolidation settlement will be about 0.2 m. After 9 months, 0.1 m of settlement has occurred. a) What will be the consolidation settlement after 3 years ( 1 yr = 365 days)? b) Estimate the time it will take for the ultimate consolidation settlement of 0.15m to occur? (Use T95 for your estimate) Provide your answer in years.
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?
An oedometer test is performed on a 2 cm thick clay sample. After 5 minutes, 50% consolidation is reached. After how long a time in no. of days would the same degree of consolidation be achieved in the field where the clay layer is 3.70 m thick? Assume the sample and the clay layer have the same drainage boundary conditions (double drainage).Show Diagram a.234 b.119 c.564.3 d.17.15
Q#2: (a). What is consolidation? Explain the concept of NCR and OCR with examples in your own words. (b). The results of a consolidation test on an undisturbed soil sampled at a depth of 10m below the Ground level are as follows: ϒsat = 16KN/m3, Pre consolidation pressure =90 KPA, ϒw = 10KN/m3. Calculate the over consolidation of soil and Type of consolidation soil.
Q#2: (a). What is consolidation? Explain the concept of NCR and OCR with examples in your own words. (b). The results of a consolidation test on an undisturbed soil sampled at a depth of 10m below the Ground level are as follows: ϒsat = 16KN/m3, Pre consolidation pressure =90 KPA, ϒw = 10KN/m3. Calculate the over consolidation of soil and Type of consolidation soil. Solve only part B
A 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.564.3
A 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%)
Refer to Figure Q3. Estimate the primary consolidation settlement in the clay layer. Given: Δ? = 85 ??/?2 ?1 = 2 ? ?2 = 4 ? ?3 = 6 ?. Soil characteristics are as follows (use appropriate relations):• Sand: ? = 0.65; ?? = 2.66• Clay: ?? = 54;? = 0.98; ?? = 2.74; ?'c = 150 ??/?2; ?? = 1/6 ?c
In a consolidation test the following data was obtained: Void ratio of the soil = 0.75; Specific gravity of the soil = 2.62; Compression Index = 0.1. The thickness of the compressible soil is 3 m. The increase in pressure at the center of the layer is 60 kN/m2. The preconsolidation pressure is 50 kN/m2. If the coefficient of consolidation is 2 × 10^–7 m2/s, determine the time in days for 90% consolidation. Assume one-way drainage. a. 333 b. 442 c. 346 d. 426 e. 342
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?