Design of driven piles and drilled shaft foundations(设计桩和钻孔轴驱动的基础).pdfVIP

Design of driven piles and drilled shaft foundations(设计桩和钻孔轴驱动的基础).pdf

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Design of driven piles and drilled shaft foundations(设计桩和钻孔轴驱动的基础)

Design of driven piles and drilled shaft foundations NCHRP 368 Chapter 8 pages 57 to 64 The bearing resistance and settlement behavior of driven piles and drilled shafts can be calculated in two manners: 1. Indirect methods that use conventional soil mechanics methods. 1. s , f’, E’, E , and c determined from correlation with q , u u v t f , u , v and pore pressure dissipation tests. s 2 s 2. c and c determined from lab consolidation tests. c r 2. Direct methods that incorporate a combination of the measured cone tip resistance, sleeve resistance or pore pressure data in the formulae. Direct methods for nominal axial resistance analysis of driven piles and drilled shafts • LCPC method (1982) summarized in NCHRP 368, also in FHWA-SA-91-043, The Cone Penetrometer Test • Norwegian Geotechnical Institute method (1996, 2001) in NCHRP 368 • Politecnico di Torino method (1995) in NCHRP 368 • Unicone method (1997, 2006) in NCHRP 368 • Takesue method (1998) in NCHRP 368 R = (f) (R ) = (f ) (R ) = (f) (Q ) R n stat nstat n f or fstat = 0.7 is recommended in Caltrans amendments to the LRFD BDS The total axial compression resistance of a cylindrical drilled shaft • Qtotal = Qnominal = Qs + Qb • Q = S f (A ) + q (A ) nominal p p b b • Qn = S fp (p) (d) (Dz) + qb (p) (d/2)2 • f is the unit side resistance of each soil layer (TSF or kPa) p • d is the pile diameter • Dz is the vertical thickness of eac

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