Question

7. As shown below, a cantilever type of retaining wall of 7.3 m high with two soil layers behin d the wall. The following parameters can be used: (i) soil l: c-0, φ-40° and γ-17 kNm3; (ii) soil 2: c-5 kN m 2, ф-35° andy-20 kN/m3; Assume a reduction factor k ,2/3 to comsider the cohesion and rietion angle at the base slaby the unit wecight of concrete be assumed to be 23.5 kN/m3. Calculate the factors of safety with respect to overturning, sliding, and bearing capacity. There is no water in this case. (25 marks) 0.3 m Soil 1 3 m 3.5 m Soil 2 -- 1,5 m 0.8 m 0.6m

Please

Answer 1

o.am 3m 3.5m om 2 m りcalculation ot natve earthmessuhe frees: C:O c:5 Its?nss。 3.5m Cb above Bm Po ะ".oUYkur- ratka, 6, :0.ai,(5')

2. N-Im) Lood Type Hoigont at Lood stance om Moment about Toe A) Toe Active Earth pses sure 79, 6702-0?) 子9 . 6チ 2.0% = 165-71 ZMn® 16S-71 Distaunce -from Momant load ipe Nestica toad aloout A 26.43 2 264 3 kN 52.51(1.25) | 으 +0.3+0.1 0.3(1,5)(13.5) a. 66 09 52.675 kN 3 400.9) Cas.) 2 69.qa kN Bove2 3 lo-664 bukfall ④)| , o.s +0.6+ //al,ast 2 4) | 1. 5 ( 2)l"a鬥 211.5 kN a.4rn Zv 420.25 kN kN-M)

0.3m 1.Sm am 0.3m ③ 3. 4m against seaing Fos), Resistt lida 5 ΣΗ ovce Range е 0,5-0.6 Assume M 0.55 Fos)0.55 42o.25) 19.6t - 29 (baye) a) against overlurnin Resi sting Morment Fos). ovestwnina Moment 2 Co66 165.71 # 4,02 >1,55 (gabe)

3) agaenst bearina Capacity: се fromm face o wall 2v z 666-165·귀乙1-1g9 m 20.72.5 2 z 3-4-1.199 2. 天 Base peu metie unth A Area 4ао 구 25 (o.si) 10120 420-725 3. 4 + kn/m2 23514 Avna kN/m. %un min 12-33 ,