Autonomous Drilling Grid (2D)

Blast Design

Charge per hole 55 kg

Hole spacing 4.5 m

Bench height 14 m

Delay between holes 28 ms

Holes detonate outward from the left edge, staggered by row for a V-shaped initiation front — the timing pattern real blast crews use to control fragmentation and vibration.

Live Readout

Fragment size X50

— mm

Ground vibration

— mm/s

Holes fired

0 / 0

Sequence time

0 ms

How it works

Fragment size uses the Kuznetsov equation, the standard field estimate for mean blasted fragment size:

X50 = A · (V/Q)^0.8 · Q^(1/6)
V = burden · spacing · bench height
Q = charge mass per hole (kg)
A = rock factor (fixed at 8, medium-hard rock)

Ground vibration at a 150 m monitoring point uses the USBM scaled-distance predictor, which drives real blast permitting limits:

PPV = K · (D / √Q)^-n
K = 1140, n = 1.6, D = 150 m

Only one hole detonates per delay interval, so Q here is the charge of a single hole — spreading holes across more delays (shorter grid, longer delay) lowers peak vibration without changing how much rock breaks in total.

top-down blast block · click "Fire sequence"