Geotechnical and Materials Engineering Standards for Bridge ...
Geotechnical and Materials Engineering Standards for Bridge ...
Geotechnical and Materials Engineering Standards for Bridge ...
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STRUCTURAL DLSCONTINUXTY DESCRIPTION - A discontinuity is a general<br />
term <strong>for</strong> any mechanical discontinuity in a rack mars having zero<br />
or low tensile strength. It is the collective term <strong>for</strong> moss<br />
types of joints, bedding planes, schfstosity planes, shear<br />
zones, cleavage <strong>and</strong> faults .<br />
Discontinuities can be described according to the following<br />
parameters:<br />
Orientation - dip from long axis of the core<br />
Form - overall shape of the discontinuity which may be<br />
planar, undulating, stepped or ixregular. This<br />
parameter may be dtfficult to determine from a piece<br />
of core.<br />
Roughness - surface roughness of the discontinuity which can be<br />
polished, smooth, rough or slickensided.<br />
Infilling - material that separates the rock walls of the<br />
discontinuity is usually weaker than the intact rock.<br />
Typical infilling materials are clay gouge, breccia,<br />
calcite <strong>and</strong> quartz<br />
A graphic structural log can be produced as part of the<br />
structural description. Appropriate abbreviations <strong>and</strong> symbols<br />
are noted below.<br />
4-.<br />
Roughness - Polished<br />
Smooth<br />
Rough<br />
Slickensided<br />
Inf illing<br />
Form<br />
- Clay Gouge CE<br />
Calcite Ca<br />
Quartz Qz<br />
Rust Stained Rt<br />
Breccia Bs<br />
- Planar<br />
Undulating<br />
Stepped<br />
Irregular<br />
Discontinuity - Fault (zone) fdz)<br />
Joint J<br />
Shear (zone) s(z)<br />
. Bedding B<br />
Cleavage C<br />
Ye In Y
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