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formation level. The unit weight of water is Yw = 9.81——

Design Approach 1

Geometry

Unplanned 'overdig' AH = min|~10%(Hnom - da), 0.5m] = 0.5 mO Unplanned height of excavation Hd = Hnom + AH = 6.5 m

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Vertical total stresses (excluding surcharge) at... ground level avk = 0.kPa wall toe (retained side) avk = ovk + Ykx (Hd + dd) = 225.2kPa formation level ovk = 0kPa wall toe (restrained side) ovk = ovk + Ykx dd = 101.7 kPa Difference in hydraulic head Ah = Hd = 6.5 m

Hydraulic head at wall toe htoe =-x (Hd + dd) = 4.48 m

Pore water pressures at... (assuming head falls linearly around wall) ground level u^ = 0kPa formation level uk = uk = 0kPa wall toe (retained side) uk = Ywx (d + dd - htoe) = 72.3 kPa©

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