Socket friction capacity of large diameter drilled shafts in highly weathered rock

Erol O., Horoz A., Saglamer A.

16th International Conference on Soil Mechanics and Geotechnical Engineering, Osaka, Japan, 01 January 2005, pp.2111-2114 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • City: Osaka
  • Country: Japan
  • Page Numbers: pp.2111-2114


Field load test of three drilled shafts socketed in completely weathered and exteremely fractured metadiorite / amphibolite were conducted using the Osterberg load cell. The objective of the testing was to determine the uplift capacity of short sockets bored in the base rock for foundation design verification of two major viaducts being constructed in the vicinity of North Anatolian Fault. Short piles with 2, 3, and 4m socket lengths were loaded to failure to obtain the ultimate frictional capacity in tension. Observed frictional capacity of the extremely weathered rock (soil like material) was found on the order of 200 kPa. The tests allowed to observe the mobilization of end bearing stresses at the lower part of the pile without reaching to failure.