The figure below gives the plot of void ratio versus pressure data from a consolidation test. 0.90 0.85 0.80 0.75 0.70 는.65 0.60 0.55 0.50 0.45 0.40 10 100 1000 10000 Effective consolidation pressure (kPa) (a) Determine the compression and swell indices, Ce and Cs. (b) Determine pre-consolidation pressure (o-')

The figure below gives the plot of void ratio versus pressure data from a consolidation test. 0.90 0.85 0.80 0.75 0.70 는.65 0.60 0.55 0.50 0.45 0.40 10 100 1000 10000 Effective consolidation pressure (kPa) (a) Determine the compression and swell indices, Ce and Cs. (b) Determine pre-consolidation pressure (o-')

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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Concept explainers

Calculation of Settlement

The vertical displacement of the structural foundation due to the loading from the superstructure is known as settlement. It is due to the reduction of air voids present in the soil. The amount of vertical displacement depends on the bearing capacity of the soil on which the foundation is laid. The effect of the settlement depends on the magnitude of settlement, uniformity, and the structural design of the structure. The maximum allowable settlement for residential and office buildings should be less than 18 mm, for industrial buildings, it is 38 mm and for commercial buildings, it is 25 mm.

Question

2. The figure below gives the plot of void ratio versus pressure data from a consolidation test.
0.90
0.85
0.80
0.75
0.70
9.65
0.60
0.55
0.50
0.45
0.40
10
100
1000
10000
Effective consolidation pressure (kPa)
(a) Determine the compression and swell indices, Ce and C.
(b) Determine pre-consolidation pressure (6.')
1
Void_ratio,

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Kindly answe the question in the image given below (Q3)
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Q: For the soil profile shown in figure. Determine the: a) Final consolidation settlement. b) Time (in month) required for 50% consolidation. c) Time (in month) required for the settlement to be (32) mm. d) Effective stress at the mid of the clay layer immediately after applying the load. e) Pore water pressure at the mid of the clay at the end of consolidation. f) Time (in month) required for full consolidation. g) value of maximum preconsolidation pressure (õp)at which the clay is considered as normally consolidated clay. Note: use yw= 10 kN/m³ Surcharge Aq.= 60 kPa El. 0 XXX Sand y= 15 kN/m³ El. -3 m Sand y= 17 kN/ m³ El. -6 m Clay Y. = 19.5 kN/m³ e = 0.81 C, = 1.5 m²/ yr O.C.R =1.6 C. = 0.15 C, = 0.02 El. -10 m Sand
Q₂/ From the result which obtained from consolidation test on a sample of clay soil at depth (3.5 m). Show if the soil is (N.C.C) or (O.C.C), if you know: (y sat = 18.82 kN/m³). Pressure Void ratio 0 0.903 25 0.865 50 0.843 100 0.795 200 0.730 400 0.651 800 0.555 1600 0.468 400 0.501 100 0.547 25 0.583 0 0.612
Please solve fully and please make sure the answer to the second part is in time units of years. Thank you
Estimate the total consolidation settlement (primary & secondary) after 2 years and 3 months after the completion of primary consolidation settlement of an over consolidated clay layer under the bridge pier as shown below. The pier's dimensions are (2 m x 3 m). Use Yw= 10 kN/m³ and note that the time for completion the primary consolidation is 3 years. | Qo= 960 kN G.W.L 1m Sand Ya=16.5 kN/m 2 m Ysat = 18 kN/m³ Silty Sand Ya=17.5 kN/m 3 m Ysat = 18.5 kN/m3 Clay Ya=20 kN/m , Ysat = 21 kN/m3 e, = 0.6 , Ae=0.04 , o= 78.3 kN/m2 4 m Cc= 0.4, Cs= 0.1, Ca= 0.02
Q# 2. The following are the results of a consolidation test on a sample of a clayey soil Pressure, o' (kN/m²) 1.116 25 1.108 50 1.055 100 0.962 200 0.845 400 0.755 800 0.65 1600 0.658 800 0.675 400 0.685 200 a Plot the e, log o' curve. b. Using Casagrande's method, determine the pretonsolidation pressure. Calculate the compression index, C, and the ratio of C/C. C. (Note: Use excel for calculation and drawing. Discuss the details in your own words.)
13. Situation 13 - The soil is acted upon by a uniformly distributed load ΔP = 60 kPa at the ground surface. a. Compute the settlement of the clay layer, in mm, caused by primary consolidation if the preconsolidation pressure of clay is 230 kPa. Use Cs = Cc/5. Round off to the nearest whole number. b. Compute the settlement of the clay layer, in mm, caused by primary consolidation if the clay is normally consolidated. Round off to the nearest whole number. c. Compute the settlement of the clay layer, in mm, caused by primary consolidation if the preconsolidation pressure of clay is 200 kPa. Use Cs = Cc/5. Round off to the nearest whole number.