Question

subject: soil mechanics

03:- The old building (A) is to be removed and replaced by a new building (B), as shown in Figure (Q3). The vertical pressure at the center of the clay layer from the building (A) and building (B) is equal to 13.64 kN/m² and 23.3 kN/mº respectively, Find:- 1. O.C.R after removing building (A). 2. The void ratio (e) of the clay layer: a. Immediately after removing building (A). b. After a very long time from removing building (A). 3. Final consolidation settlement of building (B) if to be constructed: a. Immediately after removing building (A). b. After a very long time from removing building (A). 4. Time required to achieve half the final consolidation settlement of building (B) (14 points) 2 Old building N.G.L 2 m W.T.L Sand, y = 15 kN/m2 Clay, y = 20 W=30% G = 2.7. C= 0.2 C = 0.04, C = 0.5m2 /y 8 m Rock

Answer 1

Building B) fold Building (A) 13 64 kN/m2 7 23.3 kN/m2 (for new NGL 2m Sand, I 2 18 kN/m² y C = 9-es om Clay, I = 20 kN/m² W 230% C=0.2 logo-logo Gs = 37. Cuzossm’lyr Q12 WG 2003X272 0081 Rock 1. OCR = Mascimum effective stress applied in past Existing Effective stress es 23.3713064 + 1S X2 + (20-10) x4 23.3 + 15x2+(20 +03x4 2 00896 4.1461 2o avoid ratio of clay layer immediately after removal of a = b es = WG dl=081 e-G 0.8t es b) Ce = 2002 logl93.3)-logL8364) 1.969-1922

le 20.806 C volt ratio after evemoval of A) 30 as. After immedlately removal of A to +A5 AH= Cc Ho teo logia 18694 2002x8 1 +0.81 logio to = 0.8839 x 0077 = 0006&BALY 0.1626 m നന്നാക zo 162.6 mm b) Afts very long time from removing A A# Dom X 30C8 AH = 0.28 1 +0.81 logro 150 tar st 2 Co2001 0.8239 x 228809 Be z OCQK8 0.8829 xlog 93.3 70 2 0.1103 m 2 110.3 mm

Total settlement 162.6+ 110.3 22729 mm 4. Tome for% 50%. Tv - U? Tigo 20.196 4 TV a Cut d² Bo 1962 0.5 mHyr xt ţ t = 0.19 688² Oos 2 25.088 years