Select all true statements. 1-Direct shear tests are useful to establish the Mohr-Coulomb envelope for intact rock. 2-In the stress-strain curve, yield occurs when the deformation becomes plastic.  3-When discontinuities are present in a rock mass, failure can occur along intact rock or along discontinuities. 4- In the stress-strain curve, strain-softening is observed between the yield point and the peak strength.  5-A lower Geological Strength Index (GSI) implies smaller Mb and s rock constants and a poor-quality rock mass.

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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Select all true statements.

1-Direct shear tests are useful to establish the Mohr-Coulomb envelope for intact
rock.
2-In the stress-strain curve, yield occurs when the deformation becomes plastic.
 3-When discontinuities are present in a rock mass, failure can occur along intact
rock or along discontinuities.

4- In the stress-strain curve, strain-softening is observed between the yield point
and the peak strength.

 5-A lower Geological Strength Index (GSI) implies smaller Mb and s rock constants
and a poor-quality rock mass.

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