Earth Pressure Theories – MCQ
1. Depth of tensile zone near the surface of a cohesive fill is –
a) [latex] (c/\gamma )/ N\phi [/latex]
b) [latex] (\gamma/c )/ N\phi [/latex]
c) [latex] (2c/\gamma )/ N\phi [/latex] ✅
d) [latex] (2c/\gamma )/ (1/ N\phi) [/latex]
2. A verticle cut in clay soil with unit weight of 19 KN/m3 failed when the depth of cut was 4.8 m. What is the cohesive strength of clay?
a) 22 KN/m2
b) 20 KN/m2
c) 21 KN/m2
d) 23 KN/m2 ✅
[Note: Formula, [latex] H_{c} = 4c/\gamma [/latex] Where, H = 4.8m, c = cohesive strength of clay, and [latex] \gamma [/latex] = 19 KN/m3 ]
3. Which Assumption is true for the Rankine Earth pressure Theory –
a) The soil mass is dry and cohesionless
b) The soil mass is semi-infinite and homogeneous
c) The back of the wall is verticle and smooth
d) All of These ✅
4. The lateral earth pressure coefficient Kp and Ka refers to
a) Total stree
b) Natural Stress
c) Effective Stress ✅
d) All of these
e) None of these
5. A verticle cut in soft clay be excavated without any lateral support up to a depth of
a) [latex] 2c/\gamma [/latex]
b) [latex] 2c\sqrt{N_{\phi }}/\gamma [/latex]
c) [latex] 4c\sqrt{N_{\phi }}/\gamma [/latex]
d) [latex] 4c/\gamma [/latex] ✅
6. Which condition fulfil the Coefficient of earth pressure at rest –
a) Greater than active earth pressure
b) Less than the Active earth pressure
c) Greater than the passive earth pressure
d) Less than the passive earth pressure
e) (a) but (d) ✅
f) (b) but (c)
7. According to Rankine’s theory the value of ‘c’ for cohesionless soil is
a) 1
b) 0 ✅
c) 1/2
d) Non of These
8. Which Assumption is true for Coulomb’s Wedge Theory
a) The backfill is dry, cohesionless, homogenous
b) The backfill is elastically undeformable
c) All of These ✅
d) None of These
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