ABSTRACT
Vander Veen's Method for Piles in Cohesionless Soils In the Vander Veen et aI., (1957) method, the ultimate end-bearing resistance of a pile is taken, equal to the point resistance of the cone. To allow for the variation of cone resistance which normally occurs, the method considers average cone resistance over a depth equal to three times the diameter of the pile above the pile point level and one pile diameter below point level as shown in Fig. 15.17(a). Experience has shown that if a safety factor of 2.5 is applied to the ultimate end resistance as determined from cone resistance, the pile is unlikely to settle more than 15 mm under the working load (Tomlinson, 1986). The equations for ultimate bearing capacity and allowable load may be written as,
pile base resistance, ultimate base capacity,
allowable base load,
(15.51a) (15.51b)
(15.51c)
where, qp =average cone resistance over a depth 4d as shown in Fig. 15.17(a) and Fs =factor of safety.
