Persistence determines the possibilities of relative movement along a discontinuity in a soil or rock mass in geotechnical engineering. Discontinuities are usually differentiated in persistent, non-persistent, and abutting discontinuities (figure).[1][2]
Persistence of discontinuities in a soil or rock mass.
A persistent discontinuity is a continuous plane in a soil or rock mass. Shear displacement takes place if the shear stress along the discontinuity plane exceeds the shear strength of the discontinuity plane.
Non-persistent discontinuityedit
A non-persistent discontinuity ends in intact soil or rock. Before movement of the material on both sides of a non-persistent discontinuity is possible, the discontinuity has to extend and break through intact material. As intact material has virtually always far higher shear strength than the discontinuity, a non-persistent discontinuity will have larger shear strength than a persistent discontinuity.
Abutting discontinuityedit
An abutting discontinuity abuts against another discontinuity. Abutting discontinuities might continue at the other side of the intersecting discontinuity, however, with a displacement to give so-called ‘stepped planes’. Shear displacement along the discontinuity can take place if the shear strength along the discontinuity plane is exceeded, and the blocks of material against which the discontinuity abuts can move or break.
Anisotropic persistenceedit
A discontinuity might be persistent in dip direction but be not persistent perpendicular to the dip direction or vice versa.[1][2]
^ ab"International Society for Rock Mechanics Commission on Standardization of Laboratory and Field Tests: Suggested methods for the quantitative description of discontinuities in rock masses". International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. 15 (6): 319–368. 1978. doi:10.1016/0148-9062(78)91472-9.
^ abISRM (1981). Brown, E.T. (ed.). Rock Characterization, Testing and Monitoring, ISRM suggested methods. Pergamon Press, Oxford. p. 211.
April 11, 2024
persistence, discontinuity, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, persistence, discontinuity, news, newspa. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Persistence discontinuity news newspapers books scholar JSTOR July 2012 Learn how and when to remove this template message Persistence determines the possibilities of relative movement along a discontinuity in a soil or rock mass in geotechnical engineering Discontinuities are usually differentiated in persistent non persistent and abutting discontinuities figure 1 2 Persistence of discontinuities in a soil or rock mass Contents 1 Persistent discontinuity 2 Non persistent discontinuity 3 Abutting discontinuity 4 Anisotropic persistence 5 See also 6 ReferencesPersistent discontinuity editA persistent discontinuity is a continuous plane in a soil or rock mass Shear displacement takes place if the shear stress along the discontinuity plane exceeds the shear strength of the discontinuity plane Non persistent discontinuity editA non persistent discontinuity ends in intact soil or rock Before movement of the material on both sides of a non persistent discontinuity is possible the discontinuity has to extend and break through intact material As intact material has virtually always far higher shear strength than the discontinuity a non persistent discontinuity will have larger shear strength than a persistent discontinuity Abutting discontinuity editAn abutting discontinuity abuts against another discontinuity Abutting discontinuities might continue at the other side of the intersecting discontinuity however with a displacement to give so called stepped planes Shear displacement along the discontinuity can take place if the shear strength along the discontinuity plane is exceeded and the blocks of material against which the discontinuity abuts can move or break Anisotropic persistence editA discontinuity might be persistent in dip direction but be not persistent perpendicular to the dip direction or vice versa 1 2 See also editDiscontinuity geotechnical engineering Rock mechanics Shear strength discontinuity References edit a b International Society for Rock Mechanics Commission on Standardization of Laboratory and Field Tests Suggested methods for the quantitative description of discontinuities in rock masses International Journal of Rock Mechanics and Mining Sciences amp Geomechanics Abstracts 15 6 319 368 1978 doi 10 1016 0148 9062 78 91472 9 a b ISRM 1981 Brown E T ed Rock Characterization Testing and Monitoring ISRM suggested methods Pergamon Press Oxford p 211 Retrieved from https en wikipedia org w index php title Persistence discontinuity amp oldid 1162929035, wikipedia, wiki, book, books, library,
