Civil Thinking

   Engineering  properties

  • •T, P, composition changes à metamorphic rocks
  • •Again – variable in properties à strength
  • •foliated rocks
  • •planes of weakness along foliation
  • •strength: depends on directions of stress  (slate to schist)
  • •gneiss:   interlocking xls & limited foliation
  • •massive (nonfoliated)
  • •quartzite, hornfels  – very strong
  • •marble:  large interlocking xls, but weak à lower strength
  • And – remember the discontinuities !

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