How we calculate RMR value?

Question

Accepted Answer

RMR value is calculated by assigning scores to various parameters related to rock mass characteristics.

RMR stands for Rock Mass Rating.
It is calculated by assigning scores to six parameters: uniaxial compressive strength, rock quality designation, spacing of discontinuities, condition of discontinuities, groundwater conditions, and orientation of discontinuities.
The scores for each parameter are added up to get the RMR value, which ranges from 0 to 100.
RMR value is used to assess the stability of rock masses and to design support systems for underground excavations.
For example, an RMR value of 50 or higher indicates a stable rock mass that requires minimal support, while an RMR value of less than 20 indicates a highly unstable rock mass that requires extensive support.

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