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6. A rectangular footing 6x3 m carries a uniform pressure of 300 KN/m2 on the surface of of a soil mass. Determine the vertical stress at a depth of 4.5 m below the surface on the center line 1.0 m inside the long edge of the foundation.

6. A rectangular footing 6x3 m carries a uniform pressure of 300 KN/m2 on the surface of of a soil mass. Determine the vertical stress at a depth of 4.5 m below the surface on the center line 1.0 m inside the long edge of the foundation.

Fundamentals of Geotechnical Engineering (MindTap Course List)
Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter17: Settlement Of Shallow Foundations
Section: Chapter Questions
Problem 17.11P
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2 m 3 m 3 m 1 m 5. Refer to Prob. 3. Determine the vertical stress at a depth of 2.5 m below point E in Fig. Prob. 3. All the other data given in Prob. 3 remain the same. 6. A rectangular footing 6x3 m carries a uniform pressure of 300 KN/m2 on the surface of of a soil mass. Determine the vertical stress at a depth of 4.5 m below the surface on the center line 1.0 m inside the long edge of the foundation. 7. A tower is founded on a circular ring type foundation. The width of the ring is 4 m and its internal radius is 8m. Assuming the distributed load per unit area as 300 KN/m2, determine the vertical pressure at a depth of 6 m below the center of the foundation. The footing is founded at a depth of 2.5m below the ground surface. 8. The L-shaped area shown in figures carries a 96KN/m2 uniform load. Find the vertical increment due to the structure load at a depth of 8m below comers A and E. Sm 4m 6.5m 4m E- 9. The plan of a rectangular loaded area is shown in the figure. The uniformly distributed load on the flexible area, q is 90KN/m2. Determine the vertical stress increase oz at a depth of Z =2m below points A, B and C. cil Engineering Departoment Page 2 Ambo university, HHC, soil mechanics-1| Assignment #1 4m 2m B 0.8m 1.6m 2m 10. A triaxial test was conducted on a granular soil under CD condition. The sample failed when the effective minor principal stress was 150 KN/m2 and the principal effective stress ratio was 4.2. Determine d and the deviator stress at failure analytically. Draw the Mohr stress circle and the Mohr strength envelope. The specimen was tested under CU condition with the total cell pressure held constant at 150 KN/m2. The pore pressure at failure was 80KN/m2. Determine both analytically and graphically, the major principal stress (effective) at failure, the total deviator stress at failure and ou if the same specimen is tested in the CU test but at a cell pressure of 250KN/m2, what will be the pore pressure at failure? 1. A sandy soil has a drained angle of friction of30°. In a drained triaxial test on the same soil, the deviatoric stress at failure is 280kN/m2. (4%) a. Determine the minor and major principal stresses. b. Determine the normal stress and shear stress on the failure plane. II
Transcribed Image Text:2 m 3 m 3 m 1 m 5. Refer to Prob. 3. Determine the vertical stress at a depth of 2.5 m below point E in Fig. Prob. 3. All the other data given in Prob. 3 remain the same. 6. A rectangular footing 6x3 m carries a uniform pressure of 300 KN/m2 on the surface of of a soil mass. Determine the vertical stress at a depth of 4.5 m below the surface on the center line 1.0 m inside the long edge of the foundation. 7. A tower is founded on a circular ring type foundation. The width of the ring is 4 m and its internal radius is 8m. Assuming the distributed load per unit area as 300 KN/m2, determine the vertical pressure at a depth of 6 m below the center of the foundation. The footing is founded at a depth of 2.5m below the ground surface. 8. The L-shaped area shown in figures carries a 96KN/m2 uniform load. Find the vertical increment due to the structure load at a depth of 8m below comers A and E. Sm 4m 6.5m 4m E- 9. The plan of a rectangular loaded area is shown in the figure. The uniformly distributed load on the flexible area, q is 90KN/m2. Determine the vertical stress increase oz at a depth of Z =2m below points A, B and C. cil Engineering Departoment Page 2 Ambo university, HHC, soil mechanics-1| Assignment #1 4m 2m B 0.8m 1.6m 2m 10. A triaxial test was conducted on a granular soil under CD condition. The sample failed when the effective minor principal stress was 150 KN/m2 and the principal effective stress ratio was 4.2. Determine d and the deviator stress at failure analytically. Draw the Mohr stress circle and the Mohr strength envelope. The specimen was tested under CU condition with the total cell pressure held constant at 150 KN/m2. The pore pressure at failure was 80KN/m2. Determine both analytically and graphically, the major principal stress (effective) at failure, the total deviator stress at failure and ou if the same specimen is tested in the CU test but at a cell pressure of 250KN/m2, what will be the pore pressure at failure? 1. A sandy soil has a drained angle of friction of30°. In a drained triaxial test on the same soil, the deviatoric stress at failure is 280kN/m2. (4%) a. Determine the minor and major principal stresses. b. Determine the normal stress and shear stress on the failure plane. II
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