Question

A cantilever sheet pile is driven into a granular soil where the water table is 2 m (L1) below the top of the sand.The properties of the sand are ?' = 40 degrees, ? = 17.5 kN/m3, and ?sat = 17.5 kN/m3. It is proposed to excavate to a depth of 6 m (L) below the ground level.

a.)Determine the actual depth to which the sheet pile must be driven (L+D) , using the net lateral pressure diagram. Note: Dactual = 1.3(Dtheory)

b.) Determine maximum moment and location. Assuming an allowable stress of 170 MN/m2, select a sheet pile from the attached table.

Moment of inertia m4/m of wall (in4/ft w mm (in.) Section modulus H mm (im) L mm (in.) f mm (in.) 0 (27.88)(0.335 (0.335)(22.4) 0 2 0 (27.88) (0.375) 0.375) (24.2) 225.12 × 10-6 0 2 5 7 0 0 5 (25.00 0.335) (0.335) (31.0) (15.25)(25.00) 0.375) (0.375) (33.5) 2 584.78 x 10- 4 2 17.70) 27.88) 0.60) 9 0 1 5 (22.00 (0.375) (0.375 (18.4) 2 1 2 (18.00 (0.375) (0.375) (31.00) 262.9 x 10-5 7 2 6 6 6 9 4 1 9 2 0

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Answer #1

So 1.2 a m D-L) Kp.14sind z 4.6 1-sin中 ress vYe 0. 2 YuS 々9.Sg 5+ 30.38 13.35+1.4 z 5389 52.9 kv Taking moments obovt o52.9 Z.565 m and, 33. b Now mzp 2. 33 7 b + 305 0512 93b 305 05+ 36.63 b al so, 52-9(b+ 2-565)-3336+ 63 36- l0s (3เจ-4 b+314,b) for deter minotion o 8m max. , replace the P above the excavation by an cguivalent horee f, uhich is acting at sheet pilewe know secto n modulos. S 오 Bmmax 0o llowable I7O XIO 2 84구 X10.5 m2 so, selectin P2-22 having S 5832X0m

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