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Classification of density of joints, volumetric joint count, and ...

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The two main groups are joints and weakness zones. these are described in the following: ▫ joint is a discontinuity plane of natural origin along which ... 3 pages
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Reference: www.rockmass.netDec. 2014Classifications of some discontinuity featuresDiscontinuity is any structural or geological feature that changes or alters the homogeneity of a rock,which may be technically joints, bedding planes, minor faults, or other surfaces of weakness such ascleavage and schistosity planes. It excludes major faults, since they are considered as structural regions oftheir own.Discontinuities constitute a tremendous range, from structures of up to several kilometres in extentdown to a few centimetres, see Figure 1. The two main groups are joints and weakness zones. Theseare described in the following: Joint is a discontinuity plane of natural origin along which there has been no visible displacement.Joint is here used as a term for break, fracture, crack, as seen in Figure 1. Singularity is a small weakness zone or a seam. Weakness zone is a part or zone in the ground in which the mechanical properties are significantlylower than those of the surrounding rock...