- B) A 6 m thick of stiff saturated clay with ysat. - 18.9 kN/m² is underlain by layer of the sand , the sand is under the artesian pressure, the saturated weight density of clay lay determine the factor of safety against the heaving of clay layer at the bottom of excavation 4.05 m 6 m 3.75 m

- B) A 6 m thick of stiff saturated clay with ysat. - 18.9 kN/m² is underlain by layer of the sand , the sand is under the artesian pressure, the saturated weight density of clay lay determine the factor of safety against the heaving of clay layer at the bottom of excavation 4.05 m 6 m 3.75 m

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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Y=15kN/m²³ Y=12.5 kN/m³ 0 p = 150 kPa e₁ = 0.95 KON.C.=0.57 m = 0.4 Y = 27.5 kN/m³ sand 9m Clay [ Bedrock * ↑ 3m ↓ 18m 5m ↓↓↓ A) What is the total vertical stress, o (in kPa) at the mid point of the clay layer? B) What is the pore water pressure, u linkPa) at the midpoint of the clay layer? c) What is the effective vertical Stress, o'v (in kPa) at the midpoint of the clay layer D) What is the over consolidated Ratio (OCR) at the midpoint of the clay layer? E) What is the total horizontal Stress (inkPa) at the midpoint of the clay layer?
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A uniform surcharge of 32kN/m² has been applied on the horizontal ground surface lying 8m above the top of a 4m thick, saturated clay layer. Above the clay is sand (Unit weight of sand=18KN/m2), and below the clay (Unit weight of clay=20kN/m) lied impervious rock. The final consolidation settlement in the clay layer has been calculated as 24mm. The point P lies 1.0m below the top of the clay layer. The coefficient of consolidation of the clay is 1.6m2/year. (Remainder Ty=C,.t/d). Just write the answers, no need to show calculations. a) What is the degree of consolidation at point P, when the pore pressure at P is 68kPa? b) How many years are required for 50% average degree of consolidation in the clay layer, if the relevant time factor is 0.196.? C) What is the effective stress at the middle of the sand layer immediately after the application of surcharge, if the drained and saturated unit weights of the sand are 16kNm3 and 18kN/m3, respectively. d) What is the increase in effective…
Fground surface Y-15.6 kN/m Year-16.6 KN/m 4 m waler table Clay 5 m Y=17,8 kN/m Compute the effective stress at the bottom of the clay. a) 120.53 kPa b) 102.35 kPa e) 112.65 kPa d) 121.56 kPa If the water table rises to the level of the soll surface, what is the effective stress at the bottom of the clay? a) 66.55 kPa b) 78.11 kPa c) 67.11 kPa d) 48.19 kPa
1 b solve.
Find h ?if the effective stress at bottom=200.85 kN/m². clay Y=18 kN/m³ @=12% 3m 3m 4m Silt G-2.71 S= 70% e = 0.6 Silt Capilary layer.zone Sand RF 72% n = 33% G= 2.68 max = 0.75 e
A 6 m. layer of clay is underlain by a layer of sand 4 m. in thickness. Due to the weight of soil above the mid-height of the clay it produces at geostatic pressure of 50 kPa. Void ratio of clay = 1.20 Compression index, Cc = 0.20 Determine the primary consolidation settlement if an additional stress of 28 kPa is applied to the constructed structure above the layers of soil.
Y=15kN/m³ 몰 Y = 12.5 kN/m³ 0 p = 150 kPa e.= 0.95 C₁ = 0.62 Cv=0.135 Y=27.5 kN/m³ sand 9m Clay Bedrock 25,000 KN ↑ 3m 18m ↑ 5m ↓ A) What is the induced stress so (in kPa) at the midpoint of the clay layer from the point load? B) What is the change of void ratio, se, in the clay layer because of the point load. c) Calculate the settlement (in the nearest cm) at the clay layer because of the point load. Use the one layer approach. D) while the one-layer approach is not accurate to represent the distributed stress from the point load, how many layers would be proper?
20. A 17-m thick soil has water table 4 m. below the ground surface. The soil has a void ratio of 0.53 and specific gravity of 2.65. Above the water table, the soil has a degree of saturation equal to 40.67%. Direct shear test conducted on the soil shows that the an angle of internal friction of 26.04° and cohesion of 17.17 kPa. What is the potential shear strength (in kPa) on a horizontal plane at a depth of 9 m. below the ground surface? Round off to two decimal places.
Compute the settlement of the clay layer caused by primary consolidation if the pre consolidation pressure of the clay is 96kPa. use approximate method for average vertical stress.
Effective Stresses in Soil Problem 3. A 4m thick of clay is overlain by 4m thick of sand. The ground water table is 1m below the natural grade line. Clay and sand have saturated unit weights of 19.5 and 17.3 kn/m³ respectively. Sand above the water retains water content of 30%. LL and void ratio of clay are respectively 60% and 27.3%. Specific gravity of sand solid is 2.7. 1. Find the compression index. 2. Find the moist unit weight of sand above the water table. 3. Find the effective soil pressure at mid clay layer.
(c) The soil profile at a site consists of 2 m of clay (G, = 2.7, e = 0.5) overlying a deep deposit of gravel (G, = 2.55, e = 1.0). If the water table is at the top of the clay, determine the depth at which the effective vertical stress is 100 kPa.