By means of Boussinesq’s stress distribution theory, which one of the following pressure distribution diagrams can be prepared?
(a) Strain isobar
(b) Vertical pressure distribution on a horizontal plane
(c) Vertical pressure distribution on an inclined plane
(d) Pressure distribution diagram on an oblique plane
Ans. (b)
Ans. (b) Boussinesq’s stress distribution theory is used for vertical pressure distribution on horizontal plane, vertical pressure distribution on vertical plane and stress isobar.
The length of a line originally 100 mm
long on a map plotted to a scale of 1/1000, was
found to be 96 mm due to shrinkage of the map. The map prepared using a
tape of
length 20 m was later found to be actually 20.03 m. If a certain area
on the map, measured
using a planimeter, is 282 mm2, what is the correct area on
the ground?
A footing 3m×1.5m in plan transmits a pressure of 160 kN/m2 on a cohesive soil having E= 8×104 kN/m2 and µ=0.48. What is the immediate settlement at the centre, assuming the footing to be flexible? (Take Iw = 1.52)
(a) 2.11 mm
(b) 3.21 mm
(c) 3.51 mm
(d) 4.62 mm
Ans. (c) 3.51mm Immediate settlement or elastic settement is given as,
Which one of the following coffer dams is suitable for small heights?
(a) Cantilever sheet pile coffer dam
(b) Braced coffer dam
(c) Embankment protected coffer dam
(d) Double wall coffer dam
Ans. (a) A coffer dam may be made of earth materials, timber or steel sheet piling. Cantilever
sheet pile coffer dams are suitable for small heights, since these are susceptible to
large leakage and flood damage.
The unified classification system is based on the recognition of the type and predominance of the constituents considering
(a) grain length
(b) gradation
(c) elasticity
(d) non- compressibility
Ans. (b) Unified classification system is based on recognition of the type and predominance
of the constituents considering grain size, gradation, plasticity and compressibility
Which one of the following is an advantage when geo-textiles is used in road works?
(a) Prior stripping of the natural soil
(b) Economy of aggregate
(c) Increase of different settings
(d) Slower consolidation of fills
Ans. (b)
The most frequent role of geotextiles is road construction is as a separator between
the subgrade and subbase. This prevents the subgrade material from intruding into
sub-base due to repeated traffic loading. The savings in sub-base materials, which
would otherwise be lost due to mixing with the subgrade.
Which one of the following is NOT the common nomenclature of geosynthetics?
(a) Geotextiles
(b) Geogrids
(c) Geogrouts
(d) Geonets
(c)
Geosynthetics are the synthetic fabrics used in various geotechnical applications such
as road and railway embankments, earth dikes and coastal protection structures designed
to perform one or more basic functions such as filtration, drainage, separation of soil
layers, reinforcement or stablizations. Various Geosynthetic are Geotextiles, Geogrids,
Geonets, Geosynthetic clay linear, Geomembrane, Geocomposity, Geofoams.
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