Pullout Capacity of Piles in Collapsible Soil

Pullout Capacity of Piles in Collapsible Soil

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
  
© 2017 by IJETT Journal
Volume-51 Number-3
Year of Publication : 2017
Authors : Safa Hussain Abid-Awn, Heba Qasim Hussain
DOI :  10.14445/22315381/IJETT-V51P227

Citation 

Safa Hussain Abid-Awn, Heba Qasim Hussain "Pullout Capacity of Piles in Collapsible Soil", International Journal of Engineering Trends and Technology (IJETT), V51(3),150-155 September 2017. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group

Abstract
This study is presented to investigate the behavior of concrete pile in gypseous soil with 30%, and 66% gypsum content subjected to tension load, also including a comparison to illustrate the behavior of solid steel and concrete piles types (slenderness ratio (L/D) = 10) embedded in the same soil (66% gypsum content) for both dry and 24 hr soaked specimens. The results showed 82%, and 45% capacity decrease to soaked specimens for both 30%, and 66% gypsum content samples respectively. It is argued that this lack in capacity is due to the dissolution of the gypsum. The latter reason interprets the 66% lack in the pullout capacity for the steel pile embedded in 66% gypsum content. Increasing gypsum content enhanced capacity of concrete piles for both dry and soaked samples. The pullout capacity of steel pile illustrates general trend to be more than the corresponding values of concrete types to about 46% for dry and 5% for soaked samples. That behavior can be attributed to the friction or adhesion between pile and soil particles for steel is more than concrete types.

Reference
[1] Kishida, Hideaki. "Stress distribution by model piles in sand." Soils and Foundations 4.1 (1963): 1-23.
[2] Robinsky, E. I., Sagar, W. L., and Morrison, C. F. (1964). "Effect of Shape and Volume on the Capacity of Model Piles in Sand", Canadian Geotechnical Journal, 1(4), 189-204.
[3] ASTM, D3689, (2007), "Standard Test Methods for Deep Foundations Under Static Axial Tensile Load", American Society for Testing and Materials.

Keywords
pullout, piles, gypseous soil, laboratory model, soaking, pile capacity.