Question

17.7 A reinforced earth retaining wall (Figure 17.35) is to be 10 m high. Here, Backfill: unit weight, Y = 16 kN/m and soil fric- tion angle, $i = 34° Reinforcement: vertical spacing, Sy = 1 m; horizontal spacing, Sy = 1.25 m; width of rein- forcement = 120 mm; f = 260 MN/m²; 0,= 25°; factor of safety against tie pullout = 3; and factor of safety against tie breaking = 3 Determine: a. The required thickness of ties b. The required maximum length of ties

Answer 1

Answer:

The coefficient of active earth poposure, ka from Rankine's theory. Kaz tan" {msº- or] - tan? (45° - 34] Ka=0.283 koltat T 145+212 2 = N5v Initial soin 8282: c'h The thickness of the genforcement required, tree is given fenom internal stability checks against die breakage as follows. It is to be noted that the maximum thickness is obtained for the maximum depth: z=H treq = (0, xH xkq) x 3 5,5H x FS (B) wfy - (16 X10 X0.283) x 160x1.25 .o.005num 0:12 X260 x103 * 3. treq=5. Hamm

How a)= | Kari2 а Loea - HX tan(hese-+ Kgx SySH x 2wx tanker 5 XFS (P) oCP) * lo xian(s- 3 ) 2. 283x18] 2 2X0.12xtan 250 = 5.32 +9.48 L req:14.8 m