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DEEP FOUNDATIONS – Pile Foundations

CHAPTER 7. DEEP FOUNDATIONS pile FOUNDATIONS ULTIMATE pile CAPACITY. Beacause of the non-homogeneity of soil and the unlimited variables that affecting pile behaviour, different methods of approach are, therefore, existed. Among these methods are:- a. The static methods, b. The load-transfer methods, c. The empirical methods d. The dynamic methods, and e. Field tests methods. A. STATIC APPROACH. Piles in Compression: L. Q ult = P( .C u + K s . v . tan ).dz + A b ( c + vb .N q + . ) WP .. (1). 0. Q ult = Qs + .Q b Wp ..(2). Qall = Qs / + .Q b / Wp ..(3). Qall = Qult / .. (4). where: SF = Safety factor = for driven piles, and = or = and = for bored piles. FACTOR OF SAFETY OF SINGLE pile IN CLAY. Type of pile Factor of Safety Qall. Driven piles = Qall. = QP / Bored piles (i) = Qall. = QP / (Take the smaller value) (ii) F1 = , F2 = Q all.

2 o For Piles in Clay; Equation (1) will be: Since for piles in normally consolidated clay the undrained condition is control, φu =0 and δ=0 ∴ ks.σv′.tanδ=0 and c =cu =qu / 2.Also, for φu =0: Nc =9(from Skempton chart for circular or square), Nq =1.0 and Nγ =0.0. In addition to, the difference between [Ab.q−W p] is only in (γconc.−γsoil)which is very small, that can be ...

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