LARGE DIAMETER PILE LOAD TEST WITH A CASE STUDY USING OSTERBERG - CELL
DOI:
https://doi.org/10.11113/mjce.v30.15723Keywords:
O-Cell, static load test, large diameter pile test, ASTM 1143Abstract
Static loading test using single level bidirectional –Cell was tested in March 2017 at
Paira bridge in Bangladesh for initial load testing. Soil consists of soft silt with traced clay from
0.0 m to 10.5 m underlain by various layer with very dense silty sand at the toe level and below.
Pile was constructed reverse circulation method. Drilling slurry was composed of bentonite slury
for 2.5 m diameter pile. The load cells were attached to a reinforcing cage at 18 m above toe.
Static load test was 28days of casting the pile and tested. Testing was carried as per ASTM 1143
with load increment 7.5 % estimated ultimate load. It was observed that downward movement of
reaching 220 mm and locked downward movement and O-Cell was given force for upward
movement to find out skin fraction. Detailed analysis was carried out and it was found that
ultimate load consisted of 49 MN skin frication and 30 MN end bearing sand safe design load
was calculated as 33 MN.
References
AASHTO LRFD 2012- Bridge Design Specification.
American Society for Testing and Materials (ASTM) 2004. ASTM D1143 / D1143M -
Standard Test Methods for Deep Foundations Under Static Axial Compressive
Load, West Conshohocken, PA, USA.
Fellenius, B. H. 2001. From Strain Measurements to Load in an Instrumented Pile.
Geotechnical News Magazine, Vol. 19, No. 1, pp 35-38.
