// multi-utility computation suite · offline · instant · precise
┌──────────────────────────┐
│ [c] calcalyst_ │
│ computation suite │
└──────────────────────────┘
// select a module to initialize
/ search↵ open firstesc close
// adsenseEMPTY_LEADER_SLOT728×90
// adsenseMOBILE_ANCHOR_SLOT320×50
// keyboard_shortcuts
/focus search
↑↓navigate module list
Enter
open first result from search
open highlighted
compute when module is open
compute when focused in a field
Escclose module · clear selection
⌫
eng.rock-bolt-support-design Calculator
Calculates rock bolt support pressure, factor of safety against bolt pull-out, and maximum unsupported span using empirical and analytical methods. Rock bolt spacing and length are determined by the rock mass quality (Q-system or RMR) — weaker rock requires closer, longer bolts.
Inputs
Rock Density Kg M3
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
Excavation Span M
Distance between supports (m). Longer spans experience larger bending moments — structural adequacy must be rechecked.
Rock Quality Q
Reference formula or conversion factor shown for context.
Bolt Length M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Results
recommended bolt spacing (m)
Sample size or count used in the calculation.
support pressure (kPa)
Reference formula or conversion factor shown for context.
equivalent support ratio
The proportional relationship between two quantities.
Q-value interpretation
Qualitative summary of what the computed numbers mean in practical terms.
NGI Q-system
Sample size or count used in the calculation.
bolt coverage
The fraction of the total that is protected, tested, or accounted for. Higher coverage reduces risk of gaps.