Question

General properties of discontinuity planes and their effects on rock mass quality
also explain by specifying (such as the frequency of discontinuity and the effect of the number of sets on the block size).
please don't write in handwriting or let me read it.

Answer 1

● All rock masses have bedding planes, fissures, fractures, joints and some mechanical defects which are known as discontinuities.

● There are some parameters to describe the properties of discontinuities, like:-  

1)orientation of discontinuity 2)intensity of discontinuity 3)spacing 4) frequency of discontinuity 5)persistence 6)shape and size 7)roughness 8)aperture 9) discontinuity sets and block size.

● The mechanical properties of a rock mass are affected by discontinuities such as

1)planes of weakness,. 2)Mineralogical variations, 3)Bedding planes,. 4)Cracks, flaws and joints.

● The fracture or discontinuity frequency measured along a line through a rock mass is often detailed as one single figure, yet the value can depend significantly on the orientation of the line through the rock mass.

● Effects of parameter number of sets of discontinuities on rock mass is that axial strength decreases with increase of confining pressure.

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