Borehole Shear Device Feasibility and Preliminary Studies

Abstract

The present studies try to overcome the difficulties inherent to the determination of in-situ shear modulus of soils over the complete range of strains. A new apparatus is proposed: the BSD (Borehole Shear Device). It essentially consists of a self-boring cylinder which has the capabilities of expanding radially to recover the pre-existing horizontal stress levels in the soil and of rotating harmonically about its axis. This allows constructing the curve relating the secant modulus to the strain level, based on the field measurements of torque and rotation of the cylinder. The device is expected to work up to failure strains in non-gravelly soils down to depths on the order of 50 m.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1980
Accession Number
ADA090697

Entities

People

  • Douglas White
  • Joaquin Marti
  • Luis L. Rodriguez
  • Roger Sidey

Tags

Communities of Interest

  • Air Platforms
  • Counter WMD
  • Energy and Power Technologies
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Actuators
  • Computational Fluid Dynamics
  • Computational Science
  • Computer Programs
  • Control Systems
  • Finite Element Analysis
  • Geometry
  • Measurement
  • Mechanics
  • Modulus Of Elasticity
  • Numerical Analysis
  • Resonant Frequency
  • Shear Modulus
  • Standing Waves
  • Systems Engineering
  • Transducers
  • Wave Propagation

Readers

  • Aerospace Test and Evaluation
  • Geotechnical Engineering.
  • Mechanical Engineering/Mechanics of Materials.