A foundation with dimensions BxL supporting a column load, P. The foundation rests on a sandy soil underlain by a clay layer (consolidation test result in Problem 2). • Estimate the primary consolidation settlement of the clay due to the foundation load. • What is the void ratio at the end of primary consolidation? • Calculate the secondary Consolidation settlement after 6 years knowing that the primary consolidation settlement took 2.5 years. Given: P = 350 kN, B = L = 2.5 m, D= 2 m, H₁= 3 m, and H₂=4.5 m. The soil properties are as follows: Sand: ya = 16.4 kN/m³; Ysat = 18.8 kN/m³ Clay: Ysat = 17.6 kN/m³; eo = 0.82, Ca=0.02 D₁ GWT--!. BXL Ysat Clay Ysat Sand Yd Sandy gravel H₁

A foundation with dimensions BxL supporting a column load, P. The foundation rests on a sandy soil underlain by a clay layer (consolidation test result in Problem 2). • Estimate the primary consolidation settlement of the clay due to the foundation load. • What is the void ratio at the end of primary consolidation? • Calculate the secondary Consolidation settlement after 6 years knowing that the primary consolidation settlement took 2.5 years. Given: P = 350 kN, B = L = 2.5 m, D= 2 m, H₁= 3 m, and H₂=4.5 m. The soil properties are as follows: Sand: ya = 16.4 kN/m³; Ysat = 18.8 kN/m³ Clay: Ysat = 17.6 kN/m³; eo = 0.82, Ca=0.02 D₁ GWT--!. BXL Ysat Clay Ysat Sand Yd Sandy gravel H₁

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter2: Geotechnical Properties Of Soil

Section: Chapter Questions

Problem 2.14P

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A 7 ft layer of clay is buried beneath a 10 ft layer of compact granular soil. Compact sand underlies the clay. The layer of granular soil is composed of material having a unit weight of 130 pcf. The clay unit weight is 105 pcf. A lab consolidation test on a sample of the clay indicates a compression index of 0.40 and a natural void ratio of 1.30. A planned building loading will cause a 550 psf stress increase at the middle of the clay layer. What amount of primary consolidation occurs in the clay layer for the indicated conditions? How much primary consolidation of the clay layer would result if the groundwater table was at the ground surface and all other conditions are the same? How much primary consolidation would occur if the clay was an overconsolidated material, the past maximum pressure was 2,000 psf, and the swell index Cs is 0.10 and the water table is deep.
A square foundation, 2.5x2.5m in size, supports a column load of 478 kN. The soil characteristics are given in the following figure. Field monitoring indicated that the foundation settlement was 46mm at the end of 2 years. (a) Estimate the average stress increase in the clay layer due to the applied load. (b) Estimate the primary consolidation settlement. (c) What is the degree of consolidation after 2 years? (d) Estimate the coefficient of consolidation for the pressure range. (e) Estimate the settlement in 3 years.
KINDLY GET THE REAL ANSWER WITH EXPLAIN STEP Given that B =1 m, L = 3 m, and Q = 110 kN, the soil characteristics given in the figure are Cs = 1/5 Cc, Ꝺ’c= 40 kN/m2. Field monitoring indicated that the foundation settlement was 19 mm during the first 12 months. Estimate the average stress increase in the clay layer due to the applied load. Estimate the primary consolidation settlement. What is the degree of consolidation after 12 months? Estimate the coefficient of consolidation for the pressure range. Estimate the settlement in 24 months.
Given that B =1 m, L = 3 m, and Q = 110 kN, the soil characteristics given in the figure are Cs = 1/5 Cc, Ꝺ’c= 40 kN/m2. Field monitoring indicated that the foundation settlement was 19 mm during the first 12 months. Estimate the average stress increase in the clay layer due to the applied load. Estimate the primary consolidation settlement. What is the degree of consolidation after 12 months? Estimate the coefficient of consolidation for the pressure range. Estimate the settlement in 24 months.
For a certain loading condition, a saturated clay layer under goes 40% consolidation in a period of 178 days. What would be the additional time required for further 20% consolidation to occur?
An oedometer (consolidation) test is performed on a normally consolidated clay stratum that is 8.5 feet thick, and it found that the clay's initial voids ratio was e_0 = 0.8 and its primary compression index is C_c = 0.28. The in-situ stress at mid-clay layer is p_0 = 2, 650 psf, and the building exerts a pressure through its mat foundation of 970 psf. The secondary compression index C_ alpha = 0.02. The time of completion of the primary settlement is approximately 18 months. What is the total consolidation of the 8.5 foot clay stratum 5 years after the primary consolidation?
2. Why is that after the full consolidation of soil, its total effective stress will be equal to its effective stress?
In a laboratory compression test, the void ratio changes from 1.55 to 1.36 as loading increases through the range from 2,000 to 4,000 psf.(a) What is the value of the coefficient of compressibility for these conditions?(b) What is the compression index for this loading range?
STATEMENTS: A - an increase in volume is expected in 2:1 expanding type of clay when wet/saturated with water. B - cracking is expected when an expanding type of clay dries. A- both statements are trueB- neither statements are trueC- only statement A is true D- only statement B is true
A building is to be constructed on a 6 m thick stratum of the clay for which consolidation data are given in Problem 1. (a) The average in-situ void ratio of this clay stratum is 0.91 and initial effective vertical stress on this clay stratum is 200 kPa. Given that the average stress in the clay after construction of the building is 300 kPa, estimate the decrease in the thickness of the clay stratum caused by full consolidation under the building load; (b) What would the decrease in the thickness of the clay stratum be if the initial effective stress on this clay stratum were 50 kPa? The initial void ratio is also assumed to be 0.91. (c) Show on the e-logo' plot of Problem 1 the values of Ae used for making the estimates in (a) and (b). Pressure (kPa) Void ratio 0.791-0.719 0.878 – 0.691 C. log(1280/320) 3D 0.31, С. ~ =0.06, oc'= 220 kPa 20 0.958 log(320/20) 40 0.948 80 0.938 160 0.92 320 0.878 PROBLEM#1 640 0.789 1280 0.691 320 0.719 80 0.754 20 0.791 1 0.89
Problem 4: A building is to be constructed on a 6 m thick stratum of the clay for which consolidation data are given in Problem 3. (a) The average in-situ void ratio of this clay stratum is 0.91 and initial effective vertical stress on this clay stratum is 200 kPa. Given that the average stress in the clay after construction of the building is 300 kPa, estimate the decrease in the thickness of the clay stratum caused by full consolidation under the building load. (b) If the initial effective stress on this clay stratum were 50 kPa and the average stress in the clay after construction of the building is still 300 kPa, what would the decrease in the thickness of the clay stratum be? The initial void ratio is also assumed to be 0.91.
At a building site, a 3-m-thick clay layer is overlain by a stratum of sand and bounded on the bottom by rock. Calculations indicate that foundation settlement due to primary compression (consolidation) will be 40 mm. The coefficient of consolidation for the clay is 0.055 m2/month.(a) Determine the time period for 90 percent of the primary compression settlement to occur.(b) Indicate the settlement expected one year after construction.