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Rock-Socketed Shafts for Highway Structure Foundations (2006) / Chapter Skim
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Pages 96-100

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From page 96...
... identifies the major geophysical methods that are applicable to geotechnical investigations and found that overall use of geophysics by transportation agencies is expanding. Seismic refraction for establishing depth to bedrock is the most common use of geophysics for drilled shafts in rock.
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From page 97...
... Uniaxial compressive strength is used directly in the most widely applied design methods for evaluating unit side resistance, unit base resistance, and limiting pressure under lateral loading. Modulus of intact rock is not used directly, but rather with other rock mass characteristics to evaluate rock mass deformation modulus (EM)
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From page 98...
... Furthermore, O-cell and STN testing often result in higher values of allowable side resistance than would be calculated using the recommended prediction equations, which are intended to be conservative. Lateral load testing of rock sockets can be conducted using O-cell and STN methods.
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From page 99...
... Surprisingly, very little data are available by which proposed methods can be evaluated. Studies are needed involving field axial load testing in which rock mass properties are well-documented and design equations for base resistance can be evaluated.
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From page 100...
... • Conduct research and development of methods that account for permanent steel casing in the structural design of drilled shafts. Management of Load Test Data Large amounts of data from load tests on rock-socketed shafts, conducted for the purpose of research or for specific transportation projects, have been acquired, especially since the development of new testing methods.
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Key Terms

  • rock mass
  • florida limestone
  • load test
  • stn test
  • load tests

  • drilled shafts
  • compressive strength
  • lateral load
  • base resistance
  • interface roughness

  • drilled shaft
  • bearing capacity
  • axial load
  • laterally loaded
  • conventional axial

  • load transfer
  • intact rock
  • mass modulus
  • uniaxial compressive
  • shaft design

  • load testing
  • rock socket
  • rock sockets
  • geophysical methods
  • unit base

  • slake durability
  • bridge design
  • electrical resistivity
  • geotechnical capacity
  • weak rock


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