Analytical Chem Soil HW Solutions 21

Analytical Chem Soil HW Solutions 21 - Use of strength data...

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21 Use of strength data to calculate friction pile load capacity Q2.5 A friction pile, 300 mm in diameter, is driven to a depth of 25 m in dense sand of unit weight 19 kN/m 3 . The ratio of horizontal to vertical effective stresses is 0.5. The angle of friction between the pile and the sand is 26 ° and the resistance offered at the base of the pile may be ignored. The natural water table, below which the pore water pressures are hydrostatic, is 5m below ground level. During construction works, the water table is temporarily lowered to a depth of 16m by pumping from wells. A load test on the pile is carried out while pumping to lower the groundwater level is still in progress. Calculate the ultimate load capacity of the pile (a) observed in the test, and (b) after pumping from the wells has stopped, and the water table has recovered to its natural level. Q2.5 Solution The vertical total stress σ v , the pore water pressure u and the vertical ( ' v ) and horizontal ( ' h ) effective stresses all vary linearly with depth between the soil surface and the water
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This note was uploaded on 12/28/2011 for the course CHM 4302 taught by Professor Stuartchalk during the Fall '11 term at UNF.

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