Static skin friction behavior of a single micropile in sand

Numerical pile segment analyses were conducted using an advanced soil model to investigate the development of side resistance and the soil behavior around a micropile installed in sand and subjected to static axial loading. A series of static pile segment analyses were performed for micropiles and Conventional Drilled Cast-In-Place (CDCIP) piles considering effects of pile installation, relative density of sand and pile diameter. Results of analyses were used to determine the effects of pile installation, pile diameter, and relative density of sand on static shear behavior of a micropile and changes in effective stresses and volumetric strains in the soil adjacent to the interface. Relatively high side resistance and stiff t-z response were characteristic features of a micropile compared with CDCIP piles. Results of static numerical pile segment analyses for micropiles were compared and found to exhibit good agreement with pile loading tests and design methods.

[1]  James H. Long,et al.  Skin friction features of drilled CIP piles in sand from pile segment analysis , 2008 .

[2]  M. Boulon.  BASIC FEATURES OF SOIL STRUCTURE INTERFACE BEHAVIOUR , 1989 .

[3]  Branko Ladanyi,et al.  A numerical solution of cavity expansion problem in sand based directly on experimental stress-strain curves , 1998 .

[4]  Guy T. Houlsby,et al.  FINITE CAVITY EXPANSION IN DILATANT SOILS: LOADING ANALYSIS , 1991 .

[5]  K. Terzaghi,et al.  Soil mechanics in engineering practice , 1948 .

[6]  O. C. Zienkiewicz,et al.  Simple model for transient soil loading in earthquake analysis. I. Basic model and its application , 1985 .

[7]  O. C. Zienkiewicz,et al.  Generalized plasticity and the modelling of soil behaviour , 1990 .

[8]  Ilan Juran,et al.  Micropiles: the state of practice. Part II: design of single micropiles and groups and networks of micropiles , 1999 .

[9]  Djoni Eka Sidarta.  Neural Network-Based Constitutive Modeling of Granular Material , 2000 .

[10]  D. M. Potts,et al.  The shaft resistance of axially loaded piles in clay , 1982 .

[11]  Hoe I. Ling,et al.  Pressure-Level Dependency and Densification Behavior of Sand Through Generalized Plasticity Model , 2003 .

[12]  O. C. Zienkiewicz,et al.  Simple model for transient soil loading in earthquake analysis. II. Non-associative models for sands , 1985 .

[13]  Sung June Lee.  Behavior of a Single Micropile in Sand Under Cyclic Axial Loads , 2004 .

[14]  Yannis F. Dafalias,et al.  Dilatancy for cohesionless soils , 2000 .

[15]  E. Wernick.  Stresses and strains on the surface of anchors , 1978 .

[16]  M. Randolph,et al.  Analysis of Deformation of Vertically Loaded Piles , 1978 .

[17]  C. Gaudin,et al.  Scale effects on tension capacity for rough piles buried in dense sand , 2005 .

[18]  Vito Nicola Ghionna,et al.  An elastoplastic model for sand–structure interface behaviour , 2002 .

[19]  Kenneth L. Lee,et al.  Drained Strength Characteristics of Sands , 1967 .

[20]  Tom Armour,et al.  Micropile Design and Construction Guidelines: Implementation Manual , 2000 .

[21]  Anil Misra,et al.  Simplified analysis method for micropile pullout behavior , 2004 .

[22]  C. Clayton.  The Standard Penetration Test , 1995 .

[23]  Hai-Sui Yu,et al.  Expansion of a thick cylinder of soils , 1992 .

[24]  Jp Turner,et al.  Physical Modeling of Drilled Shaft Side Resistance in Sand , 1994 .

[25]  Thomas H. Hanna.  Foundations in Tension Ground Anchors , 1982 .

[26]  Ilan Juran,et al.  Micropiles: the state of practice Part 1: Characteristics, definitions and classifications , 1997 .