Introduction
Intrinsic elastic energy for strainburst
Evaluation of the intrinsic strainburst proneness of some rocks
Specimens and experiment procedure
Rock source | Rock type | Geological time | |
---|---|---|---|
Name | ID | ||
Linghai, China | Granite | LHG | Jurassic |
Kuru, Finland | Granite | KG | - |
Jinzhou, China | Granite | JZG | Jurassic |
India | Granite | IG | - |
Shandong, China | Granite | SDG | - |
Guangdong, China | Granite | GDG | Late Jurassic |
Sichuan, China | Granite | SCG | Tertiary Eocene (E2R) |
Iddefjord, Norway | Granite | IDG | After the Sveconorwegian orogeny |
Beishan, China | Granite | BSG | Late Permian |
Shenyang, China | Sandstone | SYS | - |
Yunnan, China | Sandstone | YNS | - |
Chifeng, China | Basalt | CFB | Tertiary |
Shandong, China | Marble | SDM | - |
Rock type | Ρ (kg/m3) | P-wave vel. (m/s) | UCS (MPa) | E (GPa) | Stiffness (GN/m) | Mineral Content |
---|---|---|---|---|---|---|
LHG | 2630 | 3032 | 222 | 56 | 1.07 | 56.2% feldspar, 25.8% quartz, 5.0% clay, 4.8% mica, 8.2% others |
KG | 2630 | 4631 | 233 | 81 | 1.60 | 35.3% quartz, 30.4% albite intermediate, 28% microcline, 6% others |
JZG | 2642 | 4624 | 221 | 54 | 1.06 | 43.1% feldspar, 32.4% quartz, 9.1% mica, 6.1% ankerite, 4.5% lizardite, 4.8% others |
IG | 2628 | 4451 | 237 | 74 | 1.45 | 78% feldspar, 12.3% quartz, 3.4% pyroxene, 3.0% ankerite, 3.3% others |
SDG | 2605 | 3710 | 193 | 50 | 0.97 | 63.8% feldspar, 27.2% quartz, 4.1% mica, 4.9% others |
GDG | 2682 | 4498 | 189 | 61 | 1.19 | 64.5% feldspar, 15.3% quartz, 10.2% mica, 5.1% amphibole, 4.9% others |
SCG | 2644 | 3293 | 162 | 52 | 0.96 | 62.8% feldspar, 16.7% quartz, 8.8% ankerite, 3.3% mica, 8.4% others |
IDG | 2640 | 4250 | 177 | 60 | 1.16 | 69.0% feldspar, 21.0% quartz, 10% biotite |
BSG | 2590 | 3736 | 138 | 53 | 1.08 | 57% feldspar, 33% quartz, 2.0 clay, 8% others |
SYS | 2588 | 4386 | 146 | 31 | 0.61 | 60.4% feldspar, 22.0% quartz, 10.8% clay, 5.9% ankerite, 0.9% others |
YNS | 2240 | 2637 | 87 | 18 | 0.34 | 63% feldspar, 31.8% quartz, 5.2% clay |
CFB | 2902 | 5900 | 181 | 47 | 0.93 | 44.5 feldspar, 13.0 pyroxene, 12.4% cummingtonite, 9.7% forsterite, 5.9% clay, 14.5% others |
SDM | 2829 | 4017 | 111 | 60 | 1.20 | 86.1% dolomite, 8.2 calcite, 3.1% amphibole, 2.6% others |
Test results and analysis
Rock type | Test quantity | Spec. ID | Wbk (kJ/m3) | v (m/s) | Avg. Wbk (kJ/m3) | Avg. v (m/s) |
---|---|---|---|---|---|---|
LHG | 1 | LHG-1 | 67.5 | 7.2 | 67.5 | 7.2 |
KG | 1 | KG-1 | 28.3 | 4.6 | 28.3 | 4.6 |
JZG | 2 | JZG-1 | 22.7 | 4.1 | 22.0 | 4.0 |
JZG-2 | 21.2 | 4.0 | ||||
IG | 2 | IG-1 | 15.9 | 3.5 | 17.9 | 3.6 |
IG-2 | 17.9 | 3.7 | ||||
SDG | 2 | SDG-1 | 14.1 | 3.3 | 14.4 | 3.3 |
SDG-2 | 14.7 | 3.4 | ||||
CFB | 2 | CFB-1 | 12.5 | 2.9 | 13.2 | 3.0 |
CFB-2 | 14.0 | 3.1 | ||||
SYS | 2 | SYS-1 | 9.1 | 2.7 | 10.2 | 2.8 |
SYS-2 | 11.3 | 3.0 | ||||
GDG | 2 | GDG-1 | 7.6 | 2.4 | 7.6 | 2.4 |
GDG-2 | 7.6 | 2.4 | ||||
YNS | 2 | YNS-1 | 5.8 | 2.3 | 5.3 | 2.1 |
YNS-2 | 4.7 | 2.0 | ||||
SCG | 2 | SCG-1 | 4.3 | 1.8 | 4.8 | 1.9 |
SCG-2 | 5.3 | 2.0 | ||||
IDG | 1 | IDG-1 | 3 | 1.5 | 3.0 | 1.5 |
BSG | 2 | BSG-1 | 2.3 | 1.3 | 1.5 | 1.0 |
BSG-2 | 0.7 | 0.7 | ||||
SDM | 2 | SDM-1 | 0 | 0 | 0 | 0 |
SDM-2 | 0 | 0 |