Volume changes during fracture and frictional sliding: A review

  title={Volume changes during fracture and frictional sliding: A review},
  author={William Francis Brace},
  journal={pure and applied geophysics},
SummaryVolume changes in geologic materials have been measured with strain gauges, cantilever displacement gauges, or through observation of either pore or total volume. When porosity is less than 0.05, compaction is small or absent; apart from elastic strains in the minerals, dilatancy predominates, beginning at 50 to 75 percent of the fracture stress difference. When initial porosity exceeds about 0.05, compaction and dilatancy may overlap. The onset of dilatancy has not been identified, but… CONTINUE READING

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