Question: Ques 2 ( 4 0 P ) . For a foundation construcation 8 m of excavation is made in middle - stiff clayey soil. The

Ques

2 (40

) .

For a foundation construcation

8 m

of excavation is made in middle

-

stiff clayey soil. The groundwater is at the surface but it keeps at the bootom level of excavation within the excavation zone. Saturated unit weight is

18 k \frac{N}{m^{3}}

and undrained shear strength is

70 k \frac{N}{m^{3}}

for the clay. Excavation witdh is

25 m

and length is

30 m .

There exist a stiff clay layer

4 m

below the excavation surface level and undrained shear strength for that is

120 k \frac{N}{m^{3}} .

Considering excavation geometry and soil profile, compute factor of safety aginst basal heave according to Terzaghi' s method and Bjerrum and Eide's method, respectively.

Ques 2 ( 4 0 P ) . For a foundation construcation

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