A 12 m depth of sand layer has a dry unit weight of 18 kN/m' and submerged unit weight of 11 kN/m' overlies a 7 m layer of normally consolidated clay below which is an impermeable stratum. The properties of clay layer are (Gs= 2.76, w=40.5%, L.L= 48%, c, 1x10² cm²/sec). The water table was 5 m below natural ground surface. The average increase in pressure at the center of the clay layer is 120 kN/m² due to the weight of a building that constructed on ground surface. Determine: 1- The expected total primary consolidation settlement. 2- Time required for ultimate consolidation settlement. 3- Excess p.w.p at point located 1.75 m below the surface of clay layer after 6 months of applying loading. B

A 12 m depth of sand layer has a dry unit weight of 18 kN/m' and submerged unit weight of 11 kN/m' overlies a 7 m layer of normally consolidated clay below which is an impermeable stratum. The properties of clay layer are (Gs= 2.76, w=40.5%, L.L= 48%, c, 1x10² cm²/sec). The water table was 5 m below natural ground surface. The average increase in pressure at the center of the clay layer is 120 kN/m² due to the weight of a building that constructed on ground surface. Determine: 1- The expected total primary consolidation settlement. 2- Time required for ultimate consolidation settlement. 3- Excess p.w.p at point located 1.75 m below the surface of clay layer after 6 months of applying loading. B

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Layer No. Thickness, H Soil Parameters 4.1 m e = 0.52, Gs = 2.62 e = 0.56, Gs = 2.65 w = 20%, e = 0.51 2.5 m 3 2.6 m Layer 1 Layer 2 Layer 3 O Dry sand Sand E Clay O Rock If groundwater table is x = 0.25 m above point B (use yw = 9.81 kN/m3), determine: a. The effective stress at point D. b. If the effective stress at point D is lowered by 10 kPa, what is the newelevation (new x) of groundwater table measured from point B?
SITUATION 6: A deposit of clay underlain a 4.5 m thick sand. Degree of saturation of sand is 37% and void ratio is 0.52. Moisture content of clay is 42%. Natural ground water table is located at 2m below the Natural ground surface. Assume that specific gravity of sand and clay are both. equal to 2.65.. 15. Compute the unit weight of sand above water table. a. 17.345 kN/m² b. 19.345 kN/m 18.345 kN/m³ d. 20.345 kN/m³ 16. Compute the total pressure at point 10m below the ground surface. a. 163.925 kPa c. 193.925 kPa 173.925 kPa 183.925 kPa 17. Compute the effective pressure at point 10 m below the ground surface. 105.445 kPa b. 106.445 kPa d. 108.445 kPa c. 107.445 kPa
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A dense silt layer has the following properties: e=0.30, D10=10µm and capillary constant = 0.20cm2 Free ground water level is 8m below the ground surface. Determine the vertical effective stress (kPa) at 5m depth (point A). Assume unit weight of solids = 26.5 KN/m3 and that the soil above the capillary rise and ground surface is partially saturated at 50%.
ASAP
Dry sand; e = 0.55 G, = 2.66 3 m Water table 15 m. Sand G, = 2.66 e = 0.48. 5 m Clay w = 34.78% G, = 2.74 D Rock Figure P2.12 2.13 For a normally consolidated clay layer, given: Thickness 3.7 m Void ratio = 0.82 Liquid limit 42 Average effective stress on the clay layer 110 kN/m2 How much consolidation settlement would the clay undergo if the average effective stress on the clay layer is increased to 155 kN/m2 as the result of the construction of a foundation?
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A three-layer soil has the following properties: Layer 1: k = 2.57 x 10^-3 cm/s, H = 3.6 m. Layer 2: k = 1.7 x 10^-2 cm/s, H = 4.63 m. Layer 3: k = 3.19 x 10^-3 cm/s, H = 4.81 m. Determine the equivalent vertical coefficient of permeability of the soil arrangement. Layer 1 is on top of layer 2 while layer 2 is on top of layer 3.
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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%.