Situation 2 The water table in an 8 m thick silty sand deposit lies at a depth 3 m below the ground level. The entire soil above the water table is saturated by capillary water and the saturated unit weight is 18.8 kN/m³. 7. Calculate the effective stress at the ground surface in kPa. C. 14.72 D. 0 8. A. B. 29.43 7.36 Calculate the effective stress at the water table. A. 26.97 B. 85.83 C. 0 D. 56.40

Situation 2 The water table in an 8 m thick silty sand deposit lies at a depth 3 m below the ground level. The entire soil above the water table is saturated by capillary water and the saturated unit weight is 18.8 kN/m³. 7. Calculate the effective stress at the ground surface in kPa. C. 14.72 D. 0 8. A. B. 29.43 7.36 Calculate the effective stress at the water table. A. 26.97 B. 85.83 C. 0 D. 56.40

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter8: Stresses In A Soil Mass

Section: Chapter Questions

Problem 8.12P

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A layer of sand 5 meters deep overlies a thick bed of clay. calculate the vertical, horizontal, effective stresses and pore water pressure on horizontal planes to a depth of 9 meters below the ground surface in the following cases: a. If the water table is at the ground level. b. If the water table is at 2 meters below ground level and the sand above is dry. c. If the water table is at the top of the clay and the sand dry. For Sand: ysat at = 20.9kN / (m ^ 3); vdry = 17.4kN / (m ^ 3) For Clay : ysat t = 17.8kN / (m ^ 3) The coefficient of lateral earth pressure is 0.5.
a) Determine the effective stress at the bottom of the layer (Ans. 97.68 kPa) b) If the water table rises to the top of the ground surface, what is the change in the effective stress at the bottom of the clay layer. (Ans. 26.32 kPa) c) How many meters must the ground water table rise to decrease the effective stress by 14 kPa at the bottom of the clay. (Ans. 2.13 m)
If the water table was found in the interface of clay and sand instead (at 5m depth), graph the effective stress diagram of the profile. Consider a 2.5m capillary rise and S = 85% in that capillary zone. The properties of the first clay layer apply to the entire zone above the capillary zone. For specific gravity, Gs = 2.68.
4. A 10 m thick layer of shift, saturated clay is underlain by a layer of sand. The sand is under artesian pressure. (see picture below) Calculate the max depth of cut H, that can be made in the clay. (Answer: 6.9 m) Calculate the effective stress of A. (Answer: 58.9 kPa) Calculate the effective stress of B. (Answer: 19.225 kPa)
What is the intensity of active earth pressure at a depth of 10.0 m in dry sand with an angle of shearing resistance of 30 degrees and unit weight of 18kN /m ^ 3 ?
31 A sand layer 7 meters high overlies a clay layer that is 8 meters high. Ground water table is at the interface of sand and clay. The unit weight of sand is 17.98 kN/m3, saturated unit weight of clay is 19.74 kN/m3, void ratio of clay is 0.78, LL = 42. Determine the settlement (in mm) of the consolidating layer for a stress increase of 52.28 kPa.
A dense silt layer has the following properties.void ratio = 0.30eff. Diameter ?10 = 10??capillary constant (c)=0.20 cm²Groundwater level is 8.0m below the ground surface 1. Calculate the height of capillary rise in the silt. 2. Calculate the vertical effective stress in kpa at 5m depth, assume ?? = 26.5 ??/?³and that the soil above the capillary action rise and ground surface is partially saturated at 50%. 3. Calculate the effective vertical stress at 10m depth assuming ?? = 26.5 ??/?³and that the soil above the capillary action rise and ground surface is partially saturated at 50%.
A dense silt layer has the following properties: e =0.406 D10= 10.1 um Capillary constant = 0.209 sq.cm Free ground water level is 8m below the ground surface. 1.) Find the height of capillary rise in the siltin meters. 2) Find the vertical effective stress at 6m depth. Assume ys = 26.51 kn/m3 and the soil above capillary action rise and ground surface is partially saturated at 79%.
A soil stratum has two layers a 4m-thick dry sand underlain by a 5m–thick saturated sand. Dry unitweight and saturated unit weight of sand are respectively 16.21 KN/m3 and 20.88 KN/m3. a. What is the total stress at the bottom of the soil stratum?
In a clayey sandy silt deposit, the water table is 3.5 m below the surface, but the sand to a height of 1.5 m above the water table is saturated by capillary water. The top 2 m of sand can be assumed to be dry. The saturated and dry unit weights of the soil are 19.5 kN/m^3 and 18.0 kN/m^3, respectively. Calculate the effective vertical stress at 8 m below the surface. Express answers in kPa rounded to the first decimal place.
36.) A sand layer 6 meters high overlies a clay layer that is 5 meters high. Ground water table is at the interface of sand and clay. The unit weight of sand is 17.02 kN/m3, saturated unit weight of clay is 19.01 kN/m3, void ratio of clay is 0.59, LL = 42. Determine the settlement (in mm) of the consolidating layer for a stress increase of 51.11 kPa. Round off to three decimal places.
Effective Stress in Soil Problem 1. The water table in a certain deposit of soil is at a depth of 2m below the ground surface. The soil consists of clay up to depth of 4m from the ground and below which lies sand. The clay soil is saturated even above the water table: Clay strata: ? = 30%,?? = 2.72 Sandy Strata: ? = 26%, ?? = 2.64 1. Compute the total pressure. 2. Compute the pore water pressure. 3. Compute the effective stress pressure at a depth of 8m below the ground surface