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Question 1 A smooth wall retains two layers of soil as shown in Figure 1. The groundwater table is located at 3 m below the ground surface. Suatu dinding licin menahan dua lapisan tanah seperti dinurjuikan pada Rajah 1.Aras air bumi berada pada 3 m dari permukaan tanah Construct a diagram of earth pressure against the wall. Jika terdapat keadaan akrif, bina rajah bagi tekanan bumi terhadap dinding tersebut 7 i) (2 Marks/Markah) ii) Estimate the total active lateral force acting on the wall. Anggarkan jumlah dava sisi akif yang bertindak terhadap dinding tersebut) (2 Marks/Markah) ii) Estimate the total active lateral force acting on the wall if the watertable was not present. Argarkan jumlah daya sisi aketf ang bertindak terhadap dinding tersebut jika paras air tanah ridak yjud (3 Marks/Markah) iv) Discuss actions that can be undertaken in the design of this wall if the Factor of Sáfety against overturning was found to be lower than the specified value. Bincangkan perkara-perkara yang boleh dibuat terhadap rekabentuk dinding penahan ini jika factor keselamatan tehadap gulingan tidak mencapai nilai yang dikehendakki 3 Marks/Markah) clayey sand Y 17 kN/m c 10 kN/m2 3 m 20° 2 m sand 30° Figure 1 Rajah 1

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