Question

Problem 7 The soil profile at a site consists of a top 4 m layer of dense sand followed by 2 m of clay, which is underlain by a stiff stratum. The water table is at 2 m below the ground level. The following data was obtained from a consolidation test on an undisturbed sample obtained from the middle of the clay layer: water content 5 36%, specific gravity of the clay grains = 2.72, compression index = 0.72, recompression index = 0.07, pre-consolidation pressure = 85 kPa. The bulk and saturated unit weights of the sand are 17 kN/m3 and 18.5 kN/m3 respectively. The ground level was raised by placing 2 m of compacted fill with a unit weight of 20 kN/m². Estimate the final consolidation settlement. It is proposed to construct a warehouse covering a large area on top of the raised ground, which is expected to impose a pressure of 25 kPa. What would be the additional consolidation settlement?

Answer 1

25 kpa Fill 4-20 fatto 2 d=17 i sand d=18.5 w=36% Cc=0.72 G-2:72 CR=0.07 op=85kpa clay det clay Asat (Gre) do ite COG= esr 0.36X2-72 = e se- 0.979 dsat 18.335 kn m3 - (2:72 +0.97919.81 ito.979 (40) fill tan xH. 20X 2 = 40 kn/ m2 (o.initial - 2x17+(18.5-9.81)x2 +(18-335-9181)x] m2 = 59.905 kn consolidation settlement S: Har op + 10 HCc Log Soo Opl teo Iteo. 59.905+40 + 2x0.72 L09 2X0.07 (+0.979 Log 585 ogs 59.905 1 +0.979 85 0.0618 m s- 61-8 mm

Ware house construction AO - 25 kpa 00) total 40+25 -65 kpa consolidation Settlement o't До HCC Log log S= HCr teo 6160 teo 85 + 2x0.72 Log 559.905+65 lata 85 Log - 2X0:07 1-979 59905 01323 m. SE 132.3 mm Additional settement settlement -132-3-61-8 70.5mm
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