Figure Q.3 shows a sheet-pile wall cofferdam 6 m wide and 60 m long driven to a depth of 5 m in a 9 m thick deposit of s

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Figure Q 3 Shows A Sheet Pile Wall Cofferdam 6 M Wide And 60 M Long Driven To A Depth Of 5 M In A 9 M Thick Deposit Of S 1 (45.57 KiB) Viewed 32 times

Figure Q.3 shows a sheet-pile wall cofferdam 6 m wide and 60 m long driven to a depth of 5 m in a 9 m thick deposit of sand overlying an impermeable bedrock. The water level outside the pile is 3 m above the sand and 1m of sand is excavated from within the cofferdam. The properties of the sand are: You = 20 kN/m², k = 7x10³ m/s Calculate: a the seepage flow into the excavation, b- the exit hydraulic gradient at point A and c- the factor of safety against base heave (Ans. qtot 13.4x10-³m³/s, i,-0.44, FS=2.36) 6 m 3 m Sand Datum Impermeable rock 9 m Im 4m 4 m