1 Introduction
2 Methodology
2.1 Small-scale Blast Tests
Property | Granite | Mortar | Damping | |||
---|---|---|---|---|---|---|
Mean | St.dev | Mean | St.dev | Mean | St.dev | |
UCS [MPa] | 171.50 | 9.00 | 27.70 | 1.10 | – | – |
Brazilian tensile strength [MPa] | 10.85 | 1.52 | 2.90 | 0.49 | – | – |
Density [g/cm3] | 2.70 | 0.01 | 1.66 | 0.01 | 2.12 | 0.08 |
Young’s modulus [GPa] | 65.30 | 0.83 | 12.20 | 0.31 | – | – |
Poisson’s ratio [–] | 0.24 | 0.02 | 0.23 | 0.05 | – | – |
P-wave velocity [m/s] | 4908 | 111 | 3069 | 62 | 1210 | 274 |
S-wave velocity [m/s] | 3212 | 150 | 2065 | 40 | 643 | 79 |
2.2 Numerical Modelling
2.2.1 Modelling in Abaqus
2.2.2 HiDEM Model
2.2.3 Simplified n(s) Model
3 Preliminary Results
3.1 Crack Patterns
3.2 Fragmentation Analysis of Blasted Cylinders
3.3 Numerical Estimates of Fragmentation and Fines Sources
Ppeak [MPa] | Fragment mass percentage [%] | Max. diameter of branching-merging fragments rmax [mm] | |||
---|---|---|---|---|---|
Crushing | Branching-merging | Boulders | Branching-merging (<10 particles) | ||
35 | 4.5 | 1.5 | 94 | 0.5 | 14.1 |
85 | 26.5 | 19.6 | 53.9 | 1.1 | 70.9 |
166 | 37.5 | 55.3 | 7.1 | 4.3 | 52.4 |