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- Mining_rock_mass_rating abstract "Laubscher developed the Mining Rock Mass Rating (MRMR) system by modifying the Rock Mass Rating (RMR) system of Bieniawski. In the MRMR system the stability and support are determined with the following equations:RMR = IRS + RQD + spacing + conditionin which:RMR = Laubschers Rock Mass RatingIRS = Intact Rock StrengthRQD = Rock Quality Designationspacing = expression for the spacing of discontinuitiescondition = condition of discontinuities (parameter also dependent on groundwater presence, pressure, or quantity of groundwater inflow in the underground excavation)MRMR = RMR * adjustment factorsin which:adjustment factors = factors to compensate for: the method of excavation, orientation of discontinuities and excavation, induced stresses, and future weatheringThe parameters to calculate the RMR value are similar to those used in the RMR system of Bieniawski. This may be confusing, as some of the parameters in the MRMR system are modified, such as the condition parameter that includes groundwater presence and pressure in the MRMR system whereas groundwater is a separate parameter in the RMR system of Bieniawski. The number of classes for the parameters and the detail of the description of the parameters are also more extensive than in the RMR system of Bieniawski.The adjustment factors depend on future (susceptibility to) weathering, stress environment, orientation, The combination of values of RMR and MRMR determines the so-called reinforcement potential. A rock mass with a high RMR before the adjustment factors are applied has a high reinforcement potential, and can be reinforced by, for example, rock bolts, whatever the MRMR value might be after excavation. Contrariwise, rock bolts are not a suitable reinforcement for a rock mass with a low RMR (i.e. has a low reinforcement potential).Laubscher uses a graph for the spacing parameter. The parameter is dependent on a maximum of three discontinuity sets that determine the size and the form of the rock blocks. The condition parameter is determined by the discontinuity set with the most adverse influence on the stability.The concept of adjustment factors for the rock mass before and after excavation is very attractive. This allows for compensation of local variations, which may be present at the location of the rock mass observed, but might not be present at the location of the proposed excavation or vice versa. In addition, this allows for quantification of the influence of excavation and excavation induced stresses, excavation methods, and the influence of past and future weathering of the rock mass.".
- Mining_rock_mass_rating wikiPageID "31161085".
- Mining_rock_mass_rating wikiPageLength "6301".
- Mining_rock_mass_rating wikiPageOutDegree "13".
- Mining_rock_mass_rating wikiPageRevisionID "666763528".
- Mining_rock_mass_rating wikiPageWikiLink Category:Geotechnical_engineering.
- Mining_rock_mass_rating wikiPageWikiLink Category:Rock_mass_classification.
- Mining_rock_mass_rating wikiPageWikiLink Core_recovery_parameters.
- Mining_rock_mass_rating wikiPageWikiLink Discontinuity_(geotechnical_engineering).
- Mining_rock_mass_rating wikiPageWikiLink Geotechnical_engineering.
- Mining_rock_mass_rating wikiPageWikiLink Hoek–Brown_failure_criterion.
- Mining_rock_mass_rating wikiPageWikiLink International_Society_for_Rock_Mechanics.
- Mining_rock_mass_rating wikiPageWikiLink John_Wiley_&_Sons.
- Mining_rock_mass_rating wikiPageWikiLink Rock_mass_classification.
- Mining_rock_mass_rating wikiPageWikiLink Rock_mass_rating.
- Mining_rock_mass_rating wikiPageWikiLink Weathering.
- Mining_rock_mass_rating wikiPageWikiLinkText "Mining rock mass rating".
- Mining_rock_mass_rating wikiPageUsesTemplate Template:Cite_book.
- Mining_rock_mass_rating wikiPageUsesTemplate Template:Cite_conference.
- Mining_rock_mass_rating wikiPageUsesTemplate Template:Cite_journal.
- Mining_rock_mass_rating wikiPageUsesTemplate Template:Context.
- Mining_rock_mass_rating subject Category:Geotechnical_engineering.
- Mining_rock_mass_rating subject Category:Rock_mass_classification.
- Mining_rock_mass_rating type Mechanic.
- Mining_rock_mass_rating type Page.
- Mining_rock_mass_rating comment "Laubscher developed the Mining Rock Mass Rating (MRMR) system by modifying the Rock Mass Rating (RMR) system of Bieniawski.".
- Mining_rock_mass_rating label "Mining rock mass rating".
- Mining_rock_mass_rating sameAs Q6865634.
- Mining_rock_mass_rating sameAs m.0gh6ssp.
- Mining_rock_mass_rating sameAs Q6865634.
- Mining_rock_mass_rating wasDerivedFrom Mining_rock_mass_rating?oldid=666763528.
- Mining_rock_mass_rating isPrimaryTopicOf Mining_rock_mass_rating.