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186:. 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.
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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.
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might be persistent in dip direction but be not persistent perpendicular to the dip direction or vice versa.
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is a continuous plane in a soil or rock mass. Shear displacement takes place if the shear stress along the
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plane exceeds the shear strength of the discontinuity plane.
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Persistence of discontinuities in a soil or rock mass.
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272:(1981). Brown, E.T. (ed.).
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