Abstract:
The aim of this study is to conduct a bearing capacity analysis and to provide the most
suitable foundation design for the construction of Faqir Api Flyover, Mandi Mor,
Islamabad, Pakistan using ASTM standards. The subsoil investigation program was
carried out by drilling two (2) boreholes at the site's location. The method of percussion
drilling was adopted and boreholes drilled up to a maximum depth of 36m.The subsoil
mainly encountered was silty clay (CL-ML) and clay (CL). Disturbed samples were
obtained, in situ tests were carried out and soil strength assessment analysis was
performed. The Atterberg Limits (ASTM D-4318) and grain size analysis (ASTM C-
136) were performed to interpret the sub soil geotechnical behavior. Average Minimum
and Maximum SPT values encountered in both bores were 13 and 50 respectively
Moisture content ranges from 7.8 to 9.7 %. Allowable Bearing Capacity for Pile is
measured from 0 to 30 meter against 5 different diameters i.e. 0.75m, 0.90m, 1.0m,
1.2m and 1.5m. The diameter and length of the pile found to be 1.2m and 25m to
achieve the necessary allowable load. Using AASHTO LRFD equation for deep
foundation, bearing capacity was calculated. On the basis of field and lab test results
bearing capacity was calculated and pile foundation is recommended for the site.
