Structural safety assessment of adjacent reinforced concrete beam structures subject to vibrations induced by controllable pneumatic impulse rock-breaking
Bibliographic record
Abstract
Hard rock-breaking in complex and sensitive urban environments represents a critical technical challenge constraining urban development. This paper proposes a controlled pneumatic impulse rock-breaking technology and systematically evaluates its vibration impacts on adjacent structures through open-cut tunnel foundation pit experiments combined with reinforced concrete beam vibration monitoring. The results demonstrate: (1) The controlled pneumatic impulse rock-breaking exhibits a three-stage coupled interaction mechanism: impact stress wave-dominated initial fracturing, quasi-static pressure-driven crack propagation, and secondary fracturing induced by gas flow within fracture networks. This energy dissipation pathway shows distinct differences from traditional explosive impact rock-breaking. (2) Vibration attenuation demonstrates boundary condition dependency, with foundation beam zones conforming to exponential decay ( vmax = 14.41 e−0.34 x) and suspended beam zones following power-law decay ( vmax = 25.63 x−0.569), necessitating vibration mitigation measures for suspended beams. (3) The predominant vibration frequencies concentrate in 10–50 Hz, overlapping with beam natural frequencies, creating resonance-sensitive zones at structure–geological coupling interfaces and far-field propagation termini. This research establishes a structure-vibration propagation parameter coupled analysis framework, specifically addressing quantitative characterization of blasting vibration attenuation patterns and low-frequency resonance risk prediction. The findings provide theoretical and technical support for safe rock excavation in sensitive urban environments, advancing vibration control technologies for underground space development.
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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 | 0.000 |
| 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) | 0.001 | 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 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".