Q1.A multistorey building with a basement is to be constructed. The top 4 m contains loose silt below which dense sand layer is present upto a great depth. Ground water table is at the ground surface. The foundation consists of the basement slab of 6 m width which will rest on the top of dense sand as shown in figure. For dense sand saturated unit weight is 3 20kN / m3 and bearing capacity factor, Nq = 40, Nγ = 45, for loose silt saturated unit weight = 18kN / m3 , Nq = 15, Nγ = 20 . Effective cohesion is 0. Neglect depth factor average elastic modulus E, and Poisson ratio µ of dense sand is 60 ×102 kN / m2 and 0.3 respectively, using factor of safety = 3. (Take influence factor = 2)
The immediate settlement of foundation is
Answer : Option BExplaination / Solution:
Si = 552.48 × 6 × [1-(0.3)2]×2/(60×103) = 100.55 mm
Q2.A fine grained soil has liquid limit of 60 and plastic limit of 20. As per the
plasticity chart, according to IS classification, the soil is represented by the letter
symbols
Answer : Option CExplaination / Solution: No Explaination.
Q5.If σh, σv, σh and σv represent the total horizontal stress, total vertical stress,
effective horizontal stress and effective vertical stress on a soil element, respectively,
the coefficient of earth pressure at rest is given by
Answer : Option BExplaination / Solution: No Explaination.
Q7.The moisture holding capacity of the soil in a 100 hectare farm is 18 cm/m . The field is
to be irrigated when 50 percent of the available moisture in the root zone is depleted.
The irrigation water is to be supplied by a pump working for 10 hours a day, and water
application efficiency is 75 percent. Details of crops planned for cultivation are as follows
The capacity of irrigation system to irrigate crop ‘X ’ in 36 hectares is
Answer : Option BExplaination / Solution: No Explaination.
Q8.The moisture holding capacity of the soil in a 100 hectare farm is 18 cm/m . The field is to be irrigated when 50 percent of the available moisture in the root zone is depleted. The irrigation water is to be supplied by a pump working for 10 hours a day, and water application efficiency is 75 percent. Details of crops planned for cultivation are as follows
The area of crop ‘Y ’ that can be irrigated when the available capacity of irrigation
system is 40 litres/sec is
Answer : Option DExplaination / Solution: No Explaination.