Answered: Q3. The soil profile and data for the…

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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Transcribed Image Text:Font Paragraph Styles depths. The data are shown below. Assume that after construction of light slab on the surface, the soil suction goes to zero over the entire height of the active zone. Predict the free field heave that will occur after placement of the slab. Free field heave is the heave due only to change in suction with no change in effective stress. Unit weight Water content Swelling Pressure (kN/m?) Depth (m) Void ratio e Y (kN/m) (%) 2 4xx 17.5 0.59 12 4 4xx 17.9 0.54 14 5.5 4xx 18.2 0.6 16 7.5 4xx 18.8 0.63 18 ロ Q3. The soil profile and data for the (Q2) except that a large rigid raft foundation 16m square having a uniform load of 130 kN/m2 is placed on the surface. Predict the heave at the center of the foundation for the same final water content and suction conditions as Q2. Given that the stresses at different depth due to foundation applied stress in the table below. Depth m Δσ 4xx 3xx 2xx 5.5 1xx 7.5 2. 4.

Transcribed Image Text:Font Paragraph Styles Note: Swelling Pressure = 4xx kN/m2 where xx is the last number from student ID. Example for ID 118934, Xx is 34 thus, Swelling Pressure = 434 kN/m2 amd QI. An expanSIve soil profle has an active zone thickness of 6.0 m. A shallow foundation is to be constructed 1.5 m below the ground surface. A swelling pressure test provided the following data: Depth below ground surface m Swell under foundation, Sw 1.5 4 2.5 3 3.5 1.5 4.5 0.8 5.5 a. Estimate the total possible swell under the foundation. b. If the allowable total swell is 20 mm, what would be the necessary undercut? Q2. A soil profile at a site consists of a deep deposit of clay shale. The water content was observed to vary from 12% near the ground surface to about 20% at a depth of 9 m. Suction data indicated that the active zone is about 9 m. The swelling index as measured in the oedometer is 0.065. Swelling pressure was determined by constant volume oedometer tests at different depths. The data are shown below. Assume that after construction of light slab on the surface, the soil suction goes to zero over the entire height of the active zone. Predict the free field heave that will occur after placement of the slab. Free field heave is the heave due only to change in suction with no change in effective stress. Swelling Pressure (kN/m²) Unit weight Void ratio e 7 (kN/m) Depth (m) Water content (%) 2. 4xx 17.5 0.59 12

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