Experimental Model for Studying the Performance of Vertical and Batter Micropiles

Micropiles are small-diameter grouted piles (typically of diameters less than 300mm). Micropiles are ideally suited for low headroom and limited work area conditions. Specially developed installation processes mitigate noise nuisance, vibrations to surrounding soils and structures, disturbance to the production operations in individual units, and disruption to the functioning of business locality, which makes micropiles suitable for underpinning and seismic retrofitting of structures. With a wide variety of potential applications, it is necessary to understand the behavior of micropiles under different loading conditions. Reliable experimental data on battered micropiles are rather scarce compared with that of vertical micropiles. This paper presents the results from an experimental study conducted to understand the response of vertical and battered micropiles with different length/diameter ratio (L/D) subjected to vertical and lateral loading conditions. The vertical load-carrying capacity was found to increase with increasing L/D ratio upto a 300 batter. The ultimate lateral load was found to increase significantly with increasing L/D ratios up to a L/D ratio of 30 and 48 for vertical and battered piles, above which the increase in ultimate lateral load for increasing L/D ratios was found to be insignificant. Furthermore, the ultimate load capacity and mode of failure of the micropiles is a function of the angle of batter, direction of batter, and the L/D ratio for vertically and laterally loaded micropiles. The details of the experimental model employed in the study and the associated failure mechanisms are described in this paper.

Language

  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 4252-4264
  • Monograph Title: Geo-Congress 2014 Technical Papers: Geo-Characterization and Modeling for Sustainability

Subject/Index Terms

Filing Info

  • Accession Number: 01522458
  • Record Type: Publication
  • ISBN: 9780784413272
  • Files: TRIS, ASCE
  • Created Date: Mar 25 2014 3:09PM