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(c) The void ratio of the soil at a construction site is determined 0.92. The compaction work is carried out establish subgrade formation. The in place void ratio at the end of compaction was found 0.65. By assuming the moisture content remains unchanged, determine (i) Percent (\%) decreases in the total volume of the soil due to compaction. (4 marks) (ii) Percent (\%) increase in the field unit weight. (4 marks) (iii) Percent (\%) change in the degree of saturation. (4 marks)
EQUATION LIST T=π×cα​×(2D2×L​+6D2​) γ=Vw​W​ ρd​=1+ Ss​W4​​G2​ρw​​ γd​=1+100w(%)​γ​ γd​=1+SGs​w​Gd​Zˉs​​ τ′=c+σn′​tanϕ′ E= M old Volume  Number of Blow/ ayer × Number of Layer × Weig ​ α1​=a3​tan2(45∘+2ϕ​)+2ctan(45∘+2ϕ​) σ3​=σ1​tan2(45∘−2ϕ​)−2ctan(45∘−2ϕ​) σa​=2σ1​+σs​​+2σ1​−σ3​​cos2θqi​=Akαi​i​ τf​=2σ1​−σ3​​sin2θk=Aiq​ k=2.303 Ata L​log= h2​h1​​kka4​​=kd​kx​​ k= AhuQ L​i=LΔh​ k=2.727H(ht​−hr)qlog10​(tr​n​)​k=π(h12​−h22​)2.303qlog11​(t2​n​)​