Design of Rock-Socketed Drilled Shafts

This project was aimed at evaluating and developing design methods for laterally loaded drilled shafts socketed in rock. Five lateral load tests on rock socketed drilled shafts with full range of instrumentation were conducted in Ohio. Detailed instrumentation included the use of vibrating wire strain gages, inclinometers, dial gages, and load cells. P-y curves representing site-specific lateral shaft-rock interaction were deduced from strain data. Field testing included the use of a borehole pressuremeter/dilatometer to obtain measurements that were correlated with rock mass strength and deformation parameters as well as with p-y curves. A comparison was made between the baseline p-y curves deduced from strain data of lateral load tests, the p-y curves predicted by using Reese’s interim criterion, and the p-y curves from the pressuremeter tests in rock. A new hyperbolic p-y criterion for rock is proposed based on the field test data and extensive theoretical work. Validation of the proposed p-y criterion of rock was carried out by comparing the predictions of shaft deflections and bending moments using the hyperbolic p-y criterion against actual lateral load tests results. Based on the findings of this study, a complete solution for the design of drilled shafts socketed in rock or intermediate geomaterials under lateral loads is provided.

• Record URL:
  http://digitalarchive.oclc.org/request?id%3Doclcnum%3A76795400
• Corporate Authors:

  E L Robinson of Ohio, Company

  6000 Memorial Drive
  Dublin, OH  United States  43017

  Ohio Department of Transportation

  1980 West Broad Street
  Columbus, OH  United States  43223

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Nusairat, Jamal
  • Liang, Robert
  • Engel, Richard
• Publication Date: 2006-10

Language

• English

Media Info

• Media Type: Print
• Edition: Final Report
• Features: Figures; Photos; References; Tables;
• Pagination: 398p

Subject/Index Terms

• TRT Terms: Boreholes; Deflection; Deformation; Design; Field tests; Inclinometers; Load cells; Load tests; Pressure gages; Rocks; Strain gages
• Uncontrolled Terms: Drilled shafts; Lateral loads; P-Y curves; Rock mass; Rock sockets
• Geographic Terms: Ohio
• Subject Areas: Bridges and other structures; Design; Geotechnology; Highways; I24: Design of Bridges and Retaining Walls; I43: Rock Mechanics;

Filing Info

• Accession Number: 01044262
• Record Type: Publication
• Report/Paper Numbers: FHWA/OH-2006/21
• Contract Numbers: 134137
• Files: TRIS, ATRI, USDOT, STATEDOT
• Created Date: Mar 4 2007 9:03AM