Problem No. 1 A circular foundation 2 m in diameter is shown in Figure. A normally consolidated clay layer 5 m thick is located below the foundation. Determine the primary consolidation settlement of the clay. 1m Circular foundation diameter, B= 2 m 10.5 m 0,5 m q=150 kN/m² ↓ Sand G.W.T. Y=17 kN/m³ Sand Ysat = 19 kN/m³ Normally consolidated clay H₁=5 m Ysat 18.5 kN/m³ Ce=0.16 €0=0.85

Problem No. 1 A circular foundation 2 m in diameter is shown in Figure. A normally consolidated clay layer 5 m thick is located below the foundation. Determine the primary consolidation settlement of the clay. 1m Circular foundation diameter, B= 2 m 10.5 m 0,5 m q=150 kN/m² ↓ Sand G.W.T. Y=17 kN/m³ Sand Ysat = 19 kN/m³ Normally consolidated clay H₁=5 m Ysat 18.5 kN/m³ Ce=0.16 €0=0.85

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

Problem No. 1
A circular foundation 2 m in diameter is shown in Figure. A normally consolidated clay layer 5 m thick
is located below the foundation. Determine the primary consolidation settlement of the clay.
1m
Circular foundation
diameter, B= 2 m
10.5 m
0,5 m
q=150 kN/m²
↓
Sand
G.W.T. Y=17 kN/m³
Sand Ysat = 19 kN/m³
Normally consolidated clay
H₁=5 m Ysat 18.5 kN/m³
Ce=0.16
€0=0.85

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A circular foundation 2m in diameter is shown in the figure below. A normallyconsolidated clay layer 5m thick is located below the foundation. Determine the consolidation settlement of the clay. 1- method 2:1 2- consolidation settlement Cc method
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Q: A consolidated-drained tri-axial test was conducted on a normally consolidated clay. The results are as following: confining stress, G3 = 150 kN/m² and deviator stress, (Aod)t = 150 kN/m². i) Determine angle of friction, q; ii) Determine angle 0 that the failure plane makes with the major principal plane; iii) Find the normal stress and the shear stress ty on the failure plane; and iv) Determine the effective normal stress on the plane of maximum shear stress. Express your results in two decimal places.
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11.19 Refer to Figure 11.45. A square footing, 2 x 2 m in size, supports a column load of 300 kN. The soil characteristics are given in the figure. Field monitoring indi- cated that the foundation settlement was 19 mm during the first 12 months. a. Estimate the average stress increase in the clay layer due to the applied load. b. Estimate the primary consolidation settlement. c. What is the degree of consolidation after 12 months? d. Estimate the coefficient of consolidation for the pressure range. e. Estimate the settlement in 24 months. 300 kN 1m 2m x 2 m Ya = 14 kN/m3 I m Yu = 17 kN/m 24% G, = 2.74 LL = 46 2 m o'= 40 kN/m² C, = 1/5C. Sand Clay Figure 11.45 O Cengrge learring 2014