Soil Mechanics Questions and Answers – Consolidation Process – 3

This set of Soil Mechanics online quiz focuses on “Consolidation Process – 3”.

1. For an ordinary clay of medium to low sensitivity, the value of C_c corresponding to the field consolidation line is roughly equal to __________ the compression index of remolded sample.
a) 1.3
b) 2.3
c) 3.3
d) 4.3
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2. The C_c for ordinary clay of medium to low sensitivity, the value of C_c corresponding to the field consolidation line is given by ______
a) C_c=0.009(w_L-10%)
b) C_c=0.007(w_L-10%)
c) C_c=0.007(w_L-20%)
d) C_c=0.007(w_L-30%)
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3. The equation for pre-compressed soil given by Hough (1957) is ______
a) C_c=0.009(w_L-10%)
b) C_c=0.007(w_L-10%)
c) C_c=0.3(e₀-0.27)
d) C_c=0.007(w_L-30%)
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4. The coefficient of compressibility a_v is given by _____________
a) \(a_v=-\frac{e_0}{∆σ’}\)
b) \(a_v=-\frac{∆σ’}{∆e}\)
c) a_v=-∆e
d) \(a_v=-\frac{∆e}{∆σ^{‘}}\)
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5. For a given difference in pressure, the value of a_v _______ as pressure increases.
a) increases
b) decreases
c) is same
d) becomes unity
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6. The coefficient of volume change m_v is also known as ______________
a) coefficient of compressibility
b) coefficient of volume compressibility
c) compression index
d) expansion index
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7. The coefficient of volume change m_v is given by ______
a) \(m_v= \frac{1}{∆σ’} \)
b) \(m_v= \frac{-∆e}{1+e_o} \)
c) \(m_v= \frac{-∆e}{1+e_o} \frac{1}{∆σ}\)
d) \(m_v= \frac{-∆e}{1+e_o} \frac{1}{∆σ’} \)
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8. The relation between mv and a_v is __________
a) \(m_v=\frac{a_v}{e_0} \)
b) \(m_v=\frac{a_v}{1+∆σ’} \)
c) \(m_v=\frac{a_v}{1+e_0} \)
d) \(m_v=\frac{1}{e_0}\frac{a_v}{1+e_0} \)
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9. When the soil is laterally confined, the changes in volume is ______
a) proportional to change in thickness ∆H
b) inversely proportional to change in thickness ∆H
c) equal to change in thickness ∆H
d) does not depend upon the thickness
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10. The coefficient of volume change with respect to thickness is given by ______
a) \(m_v= H\frac{1}{∆σ’} \)
b) \(m_v= \frac{-∆H}{H_0} \)
c) \(m_v= \frac{-∆H}{H_0}\frac{1}{e}\)
d) \(m_v= \frac{-∆H}{H_0}\frac{1}{∆σ’} \)
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11. The change in thickness due to pressure increment is given by ______
a) ∆H = -m_v H_o ∆σ’
b) ∆H = -m_v ∆σ’
c) ∆H = -m_v H_o
d) ∆H = -H_o ∆σ’
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12. The minus sign in the change expression for change in thickness ∆H = -m_v H_o ∆σ’ denotes ______
a) thickness decreases with increase in pressure
b) thickness decreases with decrease in pressure
c) thickness increases with increase in pressure
d) thickness does not changewith increase in pressure
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13. The consolidation settlement can be computed by ______
a) using coefficient of volume change only
b) using voids ratio only
c) using both Using coefficient of volume change and voids ratio
d) using compression index only
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14. The consolidation settlement ρ_f for a soil stature of thickness H that has fully consolidated index, a pressure increment ∆σ’ with respect to m_v is given by ____________
a) ρ_f=m_v H
b) ρ_f=H∆σ’
c) ρ_f=m_v H∆σ’
d) ρ_f=m_v ∆σ’
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15. In practical case under a finite surface loading the intensity σ’ ______ with depth of layer.
a) decreases
b) increases
c) remains constant
d) has negligible effect
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