Development of a fully debonded cone bolt for rockburst support
Bibliographic record
Abstract
The development of cone bolts is briefly reviewed in this paper. It was found that local bonding between the bolt and the grout can prevent the cone from moving and effectively absorbing dynamic energy. To solve the debonding issue and provide consistent performance of modified cone bolts (MCB), we developed a new patented debonding agent in the form of a plastic sleeve installed over the shaft of the cone bolt. Dynamic and static laboratory testing combined with in situ pull tests confirmed the new system's functionality. Drop tests confirmed that this new debonding agent is much more effective than grease used in the original cone bolt design. In addition, the new cone bolt is designed for 33 mm boreholes and thus can be used in a onepass rock support system to facilitate rapid drift development in underground mines. The new fully debonded MCB33 cone bolt is characterised by higher dynamic energy absorption capacity, consistent performance, and the ability to withstand repeated impacts from sequential rockburst events.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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 source (direct Gemma or distilled Codex), 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".