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The Rock Mass Rating (RMR) System is a geomechanical classification system for rocks, developed by Z. T. Bieniawski () between 1972 and 1973.〔 〕 It combines the most significant geologic parameters of influence and represents them with one overall comprehensive index of rock mass quality, which is used for the design and construction of excavations in rock, such as tunnels, mines, slopes and foundations. ==Definition== The following six parameters are used to classify a rock mass using the RMR system #Uniaxial compressive strength of rock material #Rock quality designation (RQD) #Spacing of discontinuities #Condition of discontinuities #Groundwater conditions #Orientation of discontinuities Each of the six parameters is assigned a value corresponding to the characteristics of the rock. These values are derived from field surveys and laboratory tests. The sum of the six parameters is the "RMR value", which lies between 0 and 100. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rock mass rating」の詳細全文を読む スポンサード リンク
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