A NEW DESIGN PROCEDURE FOR DRIVEN PILES AND ITS APPLICATION TO TWO JAPANESE CLAYS

The paper describes how research into the effective stresses developed on displacement piles has led to a new design procedure for driven piles in clay. The new approach calculates local shaft friction capacity from a failure criterion derived from (i) drained interface shear tests, combined with (ii) expressions which link the radial effective stresses at failure to the initial vertical effective stress (σ'vo), the apparent overconsolidation ratio (or YSR), the clay's sensitivity (St) and the relative depth to the pile tip (h/R*). Base resistance may be assessed by conventional methods, or estimated from a new relationship involving the local average CPT resistance, qc. The new method is demonstrated and verified using data from two Japanese case histories involving tests on large instrumented driven pipe-piles.

[1]  Lymon C. Reese,et al.  Load Transfer for Axially Loaded Piles in Clay , 1966 .

[2]  P. R. Vaughan,et al.  The drained residual strength of cohesive soils , 1981 .

[3]  Paul W. Mayne,et al.  K o - OCR Relationships in Soil , 1982 .

[4]  K. Karlsrud,et al.  AXIAL STATIC CAPACITY OF STEEL MODEL PILES IN OVERCONSOLIDATED CLAY. PROCEEDINGS OF THE ELEVENTH INTERNATIONAL CONFERENCE ON SOIL MECHANICS AND FOUNDATION ENGINEERING, SAN FRANCISCO, 12-16 AUGUST 1985 , 1985 .

[5]  Richard J. Jardine,et al.  HUTTON TENSION LEG PLATFORM FOUNDATIONS: PREDICTION OF DRIVEN PILE BEHAVIOUR , 1988 .

[6]  Jean-Louis Briaud,et al.  MEASURED AND PREDICTED AXIAL RESPONSE OF 98 PILES , 1988 .

[7]  Richard J. Jardine,et al.  Effects of installing displacement piles in a high OCR clay , 1991 .

[8]  R. Jardine,et al.  Design and Performance of the Imperial College Instrumented Pile , 1991 .

[9]  Barry Lehane,et al.  Experimental investigations of pile behaviour using instrumented field piles , 1992 .

[10]  Barry Lehane,et al.  Mechanisms of Shaft Friction in Sand from Instrumented Pile Tests , 1994 .

[11]  Barry Lehane,et al.  Research into the behaviour of offshore piles: Field experiments in sand and clay , 1993 .

[12]  Barry Lehane,et al.  Displacement-pile behaviour in a soft marine clay , 1994 .

[13]  Barry Lehane,et al.  Displacement pile behaviour in glacial clay. , 1994 .

[14]  Richard J. Jardine,et al.  Shaft capacity of displacement piles in a high OCR clay , 1995 .

[15]  Tadao Hirano,et al.  Performance of Axially Loaded Steel Pipe Piles Driven in Soft Rock , 1995 .

[16]  J. F. Nauroy,et al.  The effects of time on the capacity of pipe piles in dense marine sand , 1996 .

[17]  Richard J. Jardine,et al.  Axial Capacity of Offshore Piles in Dense North Sea Sands , 1998 .