14. The soil profile consists of a 10 m layer of sand underlain by a 20 m layer of clay. The location of water table is 4 m from the ground surface. The unit weight of sand above the water table is 19.05 kN/m3 and below the saturated unit weight of sand is 20.11 kN/m3. The clay has a saturated unit weight of 18.73 kN/m3. a. Find the total stress at the bottom of clay. b. Compute the effective stress at the bottom of the clay. c. If the effective pressure at the bottom of sand is 81.9 kPa, what height above this point the water will rise in the piezometer.

14. The soil profile consists of a 10 m layer of sand underlain by a 20 m layer of clay. The location of water table is 4 m from the ground surface. The unit weight of sand above the water table is 19.05 kN/m3 and below the saturated unit weight of sand is 20.11 kN/m3. The clay has a saturated unit weight of 18.73 kN/m3. a. Find the total stress at the bottom of clay. b. Compute the effective stress at the bottom of the clay. c. If the effective pressure at the bottom of sand is 81.9 kPa, what height above this point the water will rise in the piezometer.

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 9.15P

See similar textbooks

Similar questions

Problem 1 A ground profile consists of 2 m of silty sand underlain by 3 m of clay. The ground water table is 3 m below the ground surface. The sand has a unit weight of 14 kN/m3. The clay has unit weight of 16 kN/m3 above the water table and 20 kN/m3 below the water table. a. Determine the total stress at bottom of the clay b. Determine the pore water pressure at the bottom of the clay c. Determine the effective stress at the bottom of the clay Problem 2 50 ft thick sand is underlain by 25 ft clay. The ground water table, initially at the ground surface, was lowered to a depth of 25 ft below the ground. After such lowering, the degree of saturation of the sand above water table was lowered to 20%. Saturated and dry unit weight of sand are 135 pcf and 116 pcf respectively. The saturated unit weight of clay is 120 pcf. a. What is the vertical effective pressure at the midheight of the clay layer before lowering of the water table in psf? b. What is the vertical effective pressure at the…
The soil profile consists of 5m sand underlain by 13 m layer of clay. The ground water table is at a depth 2.8 m below the surface. The sand has a unit weight of 19 kN per cu. Meter above the ground water table and the saturated unit weight below was 20 kN per cu. meter. The saturated unit weight of the clay is 15.7 kN per cu. meter. At a depth of 11 m determine the following:a. Total stressb. Pore water pressurec. Effective stress.....
1. A layer of saturated clay 4m thick is overlain by sand 5m deep. The water table being 3m below the surface. The saturated unit weights of the clay and sand are 19 and 20kN/m3, respectively. Above the water table, the dry unit weight of the sand is 17kN/m3a. Find the total stress at the bottom of the clay layer. b. Find the pore water pressure at the bottom of the clay layer. c. Find the effective stress at the bottom of the clay layer.
A ground profile consists of 2.0 meters silty sand underlain by 3.0 meters of clay. The ground water table is 3.0 meters below the ground surface. The sand has a unit weight of 14 kN/cu.meter. The clay has a unit weight of 16 kN/cu.meter above the water table and 20 kN/cu.meter below the water table. Determine the total soil stress at the bottom of the clay layer.
A 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 much
sand layer 5m thick is underlain with a thick layer of clay. the sand has a void ratio of 0.52 and specific gravity 2.64. The clay has a water content of 42% and specific gravity of 2.64. The ground water table is located 3 m below the ground surface. The sand above the water table is 30% saturated. a.) Determine the unit weight of the clay b.) Determine the total stress at a depth of 10 m below the ground surface. c.) Determine the effective stress at a depth of 10m below the ground surface.
A granular soil deposit is 4 m. thick and underlying it is a clay having a thickness of 5 m. There is a water table at the interface of the soil and the clay. Unit weight of sand is 15.6 kN/m and saturated unit weight of clay is 17.8 kN/m. O What is the effective stress at the bottom of the clay? O If the water table rises to the level of the soil surface, what is the effective stress at the bottom of the clay? O f the water is 3 m. above the soil surface, what is the effective stress at the bottom of the clay?
need fast please A soil profile consists of sand (6-m thick) which overlies a layer of clay (6-m thick). Ground water table is located at the interface of the sand and clay. The effective stress at the bottom of the clay layer was determined. If the water table rises to the top of the ground surface, what is the change in the effective stress (in kPa) at the bottom of the clay layer? For sand layer: Void Ratio = 0.88, Specific gravity = 2.75, Degree of Saturation = 0.79 For clay layer: Void Ratio = 0.99, Specific gravity = 2.86 Round off to two decimal places.
Dry Sand H, Groundwater Table Clay H2 Refer to the soil profile shown. Given H1 = 9.48 m., and H2 = 4.41 m. If the ground water table rises by 2.94 meters, determine the change in effective stress (numerical value only, in kPa) at the bottom of the clay layer. Properties of dry sand: Gs = 2.58, e = 0.67. Properties of clay: Gs = 2.74, e = 0.87. Round off to two decimal places.
A uniform soil deposit has a dry unit weight of 15.6 kN/m³ and a saturated unit weight of 17.2 kN/m³. The groundwater table is at a distance of 4 m below the ground surface. Point A is at a depth of 6 m below the ground surface. If the water table rises by 3.5 m, determine the change in effective stress at A. Indicate if it is maintained, increased or decreased.
A 1.5m thick layer of clay is located between 2 layers of sand. At the center of the clay layer, the total vertical stress is of 200 kPa and the pore pressure is 100 kPa. The increase in vertical stress caused by the construction of a structure, in the center of the layer will be 100 kPa. Assuming a saturated soil, Cr = 0.05, Cc = 0.3 and e = 0.9. Estimate the primary settlement of the clay, considered. - Normally consolidated soil - Pre-consolidated soil (OCR=2) - Pre-consolidated soil (OCR=1.5)
The soil profile was consists of 4 m sand at the top and 5 m clay at the bottom. The specific gravity of sand and clay is 2.65 and 2.67 respectively and the void ratio of sand and and clay is 0.61 and 0.48 respectively. The water table is located at the interface of sand and clay. Determine the following:a. Effective stress at the bottom of sand layer.b. Effective stress at the bottom of soil strata.c. the depth of water table from the ground so that the effective stress at the bottom of clay layer becomes 104 kPa.....