The Rock-Breaking Mechanism of Directional Fracture Blast Using an Irregular Shape Cartridge and Its Field Application
Bibliographic record
Abstract
Abstract The testing system of digital laser dynamic caustics was performed here to examine the super-dynamic fracture mechanics of directional blasting crack, which, using an irregular shape cartridge, revealed the rock breaking mechanism of directional fracture blast. The findings show that the blasting primary crack fracture features—the typical tensile break, the variation trend of the dynamic stress intensity factor (DSIF), crack propagation velocity, and crack length— were more or less the same, the primary crack fracture was finished during 60–200 μs, the limit DSIF scarcely exceeded 1.5 MN/m3/2, and the arrest toughness of the blasting fracture was about 0.3 MN/m3/2. The irregular shape cartridge showed significant detonation wave unloading effects and detonation gas jet effects in the accumulative direction or slotting direction; the “air wedge effect” of the high-pressure detonation gas jet acted as the main drive for further expansion of the compression radial crack in the accumulative direction (or slotting direction), which also held the propagation of the compression radial crack in the nonaccumulative or nonslotting direction). Additionally, the accumulative cartridge and slotted cartridge were applied to the construction field, and it was found that the directional fracture blast was enabled, the good blasting fracture surface was formed, and better economic benefits and less operation time could be achieved using these two cartridges.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".