Soil Mechanics - Compressibility of Soil, Consolidation & Compaction

1. Time factor {T_v} = 1.781 - 0.933(100 - U\% )  for
(a) U > 50%
(b) U ≤ 60%
(c) U > 60%
(d) U ≤ 50%

2. The time required for a soil to reach a given degree of consolidation is directly proportional to
(a) cube of drainage path
(b) drainage path
(c) square of drainage path
(d) coefficient of consolidation

3. The time required for a soil to reach a given degree of consolidation is inversely proportional to
(a) time factor
(b) coefficient of consolidation
(c) drainage path
(d) square of drainage path

4. Oedometer is used for
(a) permeability test
(b) shear strength test
(c) seepage test
(d) consolidation test

5. In a soil sample of a consolidometer test, pore water pressure is
(a) minimum at the centre
(b) maximum at the top
(c) maximum at the bottom
(d) maximum at the centre (IES 1993)

6. Coefficient of consolidation is determined by
(a) Casagrande’s Logarithm of time fitting method
(b) Taylor’s square root of time fitting method
(c) both (a) and (b)
(d) neither (a) nor (b)

7. When the effective stress is plotted against vertical strain(or percent consolidation), the slope of the curve is called
(a) compression index
(b) coefficient of compressibility
(c) coefficient of permeability
(d) coefficient of volume compressibility(mv)

8. The relation between coefficient of consolidation({C_v}) and coefficient of permeability (k) is
(a) {C_v} = \frac{{k(1 + {e_0})}}{{{a_v}}}.{\gamma _w} 
(b) {C_v} = k.{m_v}.{\gamma _w}  
(c) both (a) and (b)
(d) neither (a) nor (b)
Where {m_v} is coefficient of volume change(or coefficient of volume compressibility) and  {a_v} is coefficient of compressibility.

9. The unit of coefficient of volume compressibility({m_v}) is
(a) kN/m
(b) kN²/m
(c) m/kN
(d) m²/kN

10. The unit of coefficient of compressibility({a_v}) is
(a) kN/m
(b) kN²/m
(c) m/kN
(d) m/kN²

Answers

    1. (c)    2. (c)    3. (b)    4. (d)    5. (b)
    6. (c)    7. (d)    8. (c)    9. (b)    10. (b)

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