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Question 9.7: If a deposit at a site happens to be a saturated overconsoli...

If a deposit at a site happens to be a saturated overconsolidated clay with a value of q_{c}=8.8 MN / m ^{2}, determine the unconfmed compressive strength of clay given p_{0}=127 kN / m ^{2}

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Per Eq (9. 14)

 

q_{c}=N_{k} c_{u}+p_{0} \text { or } \quad c_{u}=\frac{q_{c}-p_{o}}{N_{k}} (9.14)

 

c_{u}=\frac{q_{c}-p_{o}}{N_{k}} \text { or } q_{u}=\frac{2\left(q_{c}-p_{o}\right)}{N_{k}}

 

Assume N_{k}=20. Substituting the known values and simplifying

 

q_{u}=\frac{2(8800-127)}{20}=867 kN / m ^{2}

 

If we neglect the overburden pressure p_{0}

 

q_{u}=\frac{2 \times 8800}{20}=880 kN / m ^{2}

 

It is clear that, the value of q_{u} is little affected by neglecting the overburden pressure in Eq. (9.14)

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