01 / ORIENTATION
Stereonet
Lower hemisphere
GEORESOLVE / FIELD TO REPORT
G-StructuralOrientations. Patterns. Rock mass quality.
Structural geology plots and a transparent RMR assessment in one workspace.
Ready.
02 / FREQUENCY
Rose diagram
03 / OBSERVATIONS
Measurements
Azimuths run clockwise from north. Planes use dip direction / dip or right-hand-rule strike / dip. Lines use trend / plunge. Invalid rows stay visible and are excluded from figures.
| ID | Type | Convention | Azimuth ° | Dip / plunge ° | Group | Check | Remove |
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BIENIAWSKI 1989 / DISCRETE RATINGS
Rock mass parameters
Favourability is assessed relative to the excavation geometry; it is not inferred from the stereonet. Slope adjustment is RMR89, not SMR or a stability analysis.
Methods, conventions & references
Stereonet and rose diagrams
Lower-hemisphere east/north/down vectors. Equal-area radius √(1 − sin plunge); equal-angle radius tan(45° − plunge/2). Right-hand-rule strike becomes dip direction +90°. Pole trend is dip direction +180°, plunge is 90° − dip. Great circles are sampled at 1° intervals.
Rose bins start at north and use [start, end). Axial measurements reduce modulo 180° and repeat across the opposite half; percentages divide by eligible measurements once. Petal radius is proportional to count, so petal area is not proportional to frequency. Plane strike is dip direction −90°. Lines are excluded from plane roses and planes from trend roses.
RMR89
Discrete category scores, not interpolated ratings. RQD thresholds are 25, 50, 75 and 90%, with an exact threshold assigned to the higher category. Other shared endpoints are explicitly resolved in the input labels. Groundwater uses observed conditions; intact strength uses UCS in MPa. No assumed UCS conversion from rebound or point-load measurements.
A negative raw total is retained in the report and the displayed classification score is floored at zero. Missing inputs do not produce a rock class. The five joint-condition scores sum to at most 30; the overall method replaces that sum.
Rating tables: FHWA-NHI-09-010, Table 6-3, pp. 6-10–6-11; FHWA Geotechnical Site Characterization, Table 9-6. Interface references supplied: RMR Calculator and RMR Calculator Online. Structural reference: Allmendinger Stereonet.
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