Tunneling Ground Classification
Rock mass classification systems for tunnel design — RMR (Bieniawski 1989), Q-system (Barton 1974), GSI (Hoek 2002), NATM classes, and squeezing potential (Hoek & Marinos 2000) with support requirements, TBM performance parameters, and convergence estimates
Attributes
class_number
RMR_mindimensionless
RMR_maxdimensionless
Q_mindimensionless
Q_maxdimensionless
GSI_mindimensionless
GSI_maxdimensionless
stand_up_time_hrhr
max_unsupported_span_mm
recommended_support
bolt_length_mm
bolt_spacing_mm
shotcrete_thickness_mmmm
steel_set_spacing_mm
TBM_penetration_rate_m_per_hrm/hr
TBM_utilization_pct%
advance_rate_m_per_daym/day
convergence_pct%
overbreak_pct%
notes
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