Q1/ (a) The soil profile at a building site consists of dense sand up to 2m depth, normally loaded soft clay from 2 m to 6 m depth, and stiff impervious rock below 6 m depth. The ground-water table is at 0.40 m depth below ground level. The sand has a density of 18.5 kN/m³ above water table and 19 kN/m³ below it. For the clay, saturated density is 171 kN/m³ and void ratio 1.325. Calculate the probable ultimate settlement resulting from a uniformly distributed surface load of 40 kN/m2 applied over an extensive area of the site. (b) In a laboratory consolidation test with porous discs on either side of the soil sample, the 25 mm thick sample took 81 minutes for 90% primary compression. Calculate the value of coefficient of consolidation for the sample. c) What is time needed for 60% consolidation in (a) 0 -0.4m --- 2m 2m 4m:4m 6m 2m 0.4m Sand Clay 4 Um surface pressure Y= 18.5 kN/m Yar=19 kN/m² Y=9 kN/m² w = 50% W₂ = 65% G=2,65% Scanned by TapScanner Ground surface GWT Stiff imperviou Scanned by TapScanner

Q: A silty sand fill 4.5 meters thick and an estimated density of 20 kN/m³ is to be placed over 4.0 m…

A: eo = 1.255Cc = 0.29Cr = 0.035Cv = 0.79 m2/yrNOTE : As per guidelines, first 3 parts are solved.…

Q: A 3m deep sand layer has a specific gravity of 2.68 and a void ratiodf 0.60. Under this layer is a…

A: Compression index is CC=eo-eflogσ1+Δσσ1soFind inital void ratio of claySeo=woG1eo=0.32.7eo=0.81

Q: The profile at a site consists of 5m of sand overlying 10m of compressible clay, which in turn…

A: The excess pore water pressure is developed in the clay layer by immediately placing the surcharge…

Q: A silty sand fill 4.5 meters thick and an estimated density of 20 kN/m³ is to be placed over 4.0 m…

A: Cv = 0.79 m2/yr = 20 kN/m3

Q: The profile at a site consists of 5 m of sand overlying 10 m of compressible clay, which in turn…

A: The excess pore water pressure developed immediately after placing the stress of 200 kPa is…

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Q: A 6 m depth of sand layer has a dry unit weight of 14.9 kN/m' and satura weight of 18.1 kN/m³…

A: Gs = 2.7Cv = 4.3 m2/yr = 100 kPaNOTE : As per guidelines, 3 parts are solved. Request you to post…

Q: The soil profile at a site for a proposed office building consists of a layer of fine sand 10.4 m…

A: Given : Water content of clay, wc = 38%Initial height, Ho = 2 mVoid ratio of sand, eo = 0.76Vertical…

Q: A soil profile consists of 6 m of coarse sand overlying 12 m of firm clay. Below the clay there is a…

A: Total stress: The summation of all the stresses exerted by the total weight of the soil and load on…

Q: A 3m deep sand layer has a specific gravity of 2.68 and a void ratio of 0.60. Under this layer is a…

A: For this problem we dont need to use the Coeff of consoldiation formula , as the final void ratio is…

Calculation of Settlement

The vertical displacement of the structural foundation due to the loading from the superstructure is known as settlement. It is due to the reduction of air voids present in the soil. The amount of vertical displacement depends on the bearing capacity of the soil on which the foundation is laid. The effect of the settlement depends on the magnitude of settlement, uniformity, and the structural design of the structure. The maximum allowable settlement for residential and office buildings should be less than 18 mm, for industrial buildings, it is 38 mm and for commercial buildings, it is 25 mm.