Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 9, Problem 9.15P
To determine
Calculate the additional consolidation settlement caused by the lowering of the water table.
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PROBLEM 1: A layer of sand 4.5m thick with
specific gravity of 2.60, degree of saturation
of 85%, and porosity of 41.18% with a 5 m thick
of clay with specific gravity of 2.65 and a
water content of 0.28. Ground water table is
located at the interface of the two soils.
Compute the depth below the ground surfac
would the effetive stress be 100kPa.
B. Compute the effective stress at a depth 8m
below the ground surface.
C. Compute the depth of excavation required to
reduce the effective stress by 60 kPa
2. Solve and show solution.
A soil layer consists of 4 meters upper dry sand with a void ratio of 0.45 and a specific gravity of 2.70. The lower 3 meters is clay having a void ratio of 0.9 and a specific gravity of 2.75. The ground water table is 4 meters below ground surface. Compute a) effective stress at 4 meters below ground surfaceb) effectivestress at the bottom of the clay layer c) effective stress at 6 meters below ground surface.
Chapter 9 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- Refer to Figure 11.41. 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. 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 12 months? d. Estimate the coefficient of consolidation for the pressure range. e. Estimate the settlement in 24 months. Answer must be: A. 6.33 B. 32.82 C. 57.89 D. 0.0013 E. 25.66arrow_forwardMy soil has the following profile with depth: 0-10 ft gammat = 115 pcf 10-30 ft gammasat = 98 pcf 30-55 ft gammasat = 110 pcf where gamma is the unit weight The water table is at a depth of 10 ft. Plot the total stress, effective stresses, and pore pressure versus depth. Show the calculations, and assume there is no capillarity.arrow_forwardThe soil profile at a site consists of 10 m of gravelly sand underlain by a soft clay layer. The water table lies 1 m below the ground level. The moist and saturated unit weights of the gravelly sand are 17.0 kN/m3 and 20.0 kN/m3, respectively. Due to some ongoing construction work, it is proposed to lower the water table to 3 m below the ground level. What will be the change in the effective stress on top of the soft clay layer?arrow_forward
- For a normally consolidated soil, the following is given: Determine the following: a. The compression index, Cc. b. The void ratio corresponding to pressure of 200 kN/m2arrow_forwardA square footing supporting a new building applies a uniform pressure of 200 kPa on the ground surface. The water table is at the ground surface and the site is underlain by a homogeneous sand deposit. Based on the bulbs of pressure developed below the footing depicted in the figure below, calculate the vertical total stress in kPa at point C (acceptable tolerance = 2%).arrow_forwardA ground profile consists of 2m silty sand underlain by 3m of clay. The ground water table is 3m below the ground surface. The sand has a unit weight of 14kN/cum. The clay has a unit weight of 16kN/cum above the water table and 20kN/cum below the water table. Determine the Total stress at the surface of the water table (kPa). Determine the effective stress at the bottom of the clay layer (kPa). Determine the effective stress 1m from the bottom of the clay layer (kPa). Please answer this asap. For upvote. Thank you very mucharrow_forward
- I need the answer as soon as possiblearrow_forward4. please give correct answerarrow_forwardA decision has been made to consolidate the clay before the site development by applying an additional sand layer 1m thick (γ = 15kN/m^3) at the top.• What is the effective stress in the mid-layer of clay before and after the surcharge has been applied?• If the soil profile was dewatered by 1.8m while the surcharge is applied, what is the effective stress in the mid -layer of clay instead?• If a point load of 200kN was applied instead of the surcharge (and no dewatering occurred), what is the effective stress at a point 3.4m away and 1.8m deep into the profile?Final answer(s) should be in 3 decimal places.arrow_forward
- Determine the total vertical stress, pore water pressure, and the effective stress of the soil mass at the Centre of the clay layer and at the Centre of the sand layer for the conditions stated below.arrow_forwardA loose, saturated sand has a saturated unit weight, Ysat, of 120 lbs/ft3. For a point 10 feet deep in the ground below the horizontal ground surface (assuming the groundwater table is at the ground's surface): a) Draw the total and effective stress circles. b) What are the total and effective stresses on a plane measured 30° counterclockwise from horizontal?arrow_forwardgeotech. engineering A Thick layer of clay underlies a sand formation having a thickness of 4m. the groundwater is located 2m below the ground surface. The specific gravity of sand and clay is 2.65 with sand having an average void ratio of 0.52. the clay has a water content of 42%. Degree of saturation above the water table is 0.37. a. Compute the moist unit weight of the sand b. Total stress at a depth 10 m below the ground surface c. Effective stress at a depth of 10 m below the ground surfacearrow_forward
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