A square foundation is 3mx3m in plan. The soil supporting the foundation has a friction angle of Phi =21 degrees and C= 22 KN/m^2. The depth of foundation (Df) is 1.8 m and general shear failure occurs in the soil. If the water table is located at a depth of 2.5 m from the ground surface. Use the unit weight of soil (gamma) above the water, table as 17.5 KN/m^3 and the saturated unit weight of soil (gamma_Sat) is 19.5 KN/m^3. Use FS=4; Determine the maximum allowable load on the foundation using VESIC's Recommendations for water table correction.

A square foundation is 3mx3m in plan. The soil supporting the foundation has a friction angle of Phi =21 degrees and C= 22 KN/m^2. The depth of foundation (Df) is 1.8 m and general shear failure occurs in the soil. If the water table is located at a depth of 2.5 m from the ground surface. Use the unit weight of soil (gamma) above the water, table as 17.5 KN/m^3 and the saturated unit weight of soil (gamma_Sat) is 19.5 KN/m^3. Use FS=4; Determine the maximum allowable load on the foundation using VESIC's Recommendations for water table correction.

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter6: Shallow Foundations: Ultimate Bearing Capacity

Section: Chapter Questions

Problem 6.21P: Consider a continuous foundation of width B = 1.4 m on a sand deposit with c = 0, = 38, and = 17.5...

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Foundation construction

Question

A square foundation is 3mx3m in plan. The soil supporting the foundation has a
friction angle of Phi =21 degrees and C = 22 KN/m^2. The depth of foundation (Df) is
1.8 m and general shear failure occurs in the soil. If the water table is located at a depth
of 2.5 m from the ground surface. Use the unit weight of soil (gamma) above the water,
table as 17.5 KN/m^3 and the saturated unit weight of soil (gamma_Sat) is 19.5
KN/m^3. Use FS=4;
Determine the maximum allowable load on the foundation using VESIC's
Recommendations for water table correction.

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Step 1: Given:

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Step 2: Calculate the effective unit weight of soil below the water table:

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Step 3: Calculate the effective overburden pressure (sigma') at the depth of the foundation:

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Step 4: Calculate the corrected cohesion (C'c):

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Step 5: Calculate the corrected angle of internal friction (phi'):

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Step 6: Calculate the corrected bearing capacity factor (Nc'):

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Step 7: Calculate the corrected bearing capacity (q_ult'):

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Step 8: Calculate the maximum allowable load (Q_ult):

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