Charging Plan Adjustment for Rock Cavern Excavation
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Solution Overview
Problem
Current methods for designing charging plans for rock cavern excavation often fail to account for deviations in rock properties and blast outcomes, leading to inefficient excavation and increased costs due to significant variations between planned and actual rock surfaces post-blast.
Innovation Solution
The method involves determining the locations of drill hole ends and surface topography after the first round blast, using this data to modify the charging plan for subsequent rounds, thereby adjusting for differences in rock properties and improving the accuracy and efficiency of the excavation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a charging plan is designed in advance based on theoretical calculations, then the planning efficiency is improved, but the accuracy of rock surface formation deteriorates due to unaccounted rock property variations
Solution Approach 1:
The system performs preliminary actions by determining drill hole end locations and surface topography after the first round blast before designing subsequent charging plans. This allows the charging plan to be adjusted based on actual rock conditions revealed by the first blast, rather than relying solely on theoretical pre-calculations, thereby improving rock surface accuracy while maintaining planning efficiency.
2Manufacturing precision
If the charging plan is modified based on actual blast outcomes, then the excavation accuracy is improved, but the device complexity increases due to additional measurement and calculation requirements
Solution Approach 1:
The system implements feedback by measuring actual drill hole end locations and surface topography after each blast round, then using this measured data to modify the charging plan for subsequent rounds. This closed-loop feedback mechanism improves excavation accuracy by continuously adapting to actual rock conditions, while the automated measurement and calculation processes manage the complexity burden.
3Productivity
If drill hole locations are determined in advance, then the drilling efficiency is improved, but the adaptability to actual rock conditions deteriorates
Solution Approach 1:
The system applies dynamics by maintaining pre-determined drill hole locations for efficiency while dynamically adjusting the charging plan based on actual drill hole end locations and surface topography measured after each blast. This allows the system to preserve drilling efficiency from fixed locations while adapting to actual rock conditions through flexible charging plan modification.
Data Source
Figure 1~3
Figure 2~4b
Figure 5a~5d
AI summary
The invention relates to a method and an arrangement for preparing a charging plan for rock cavern excavation, in which plan drill hole locations for a round to be drilled in a tunnel face are determined in a predetermined coordinate system by using a drilling plan created by means of a computerassisted design program. The method determines pull-out of a round on the basis of the locations of the hole ends (36) and the topography (28) of the rock remaining after a round blast, and designs or modifies a charging plan for a subsequent round on the basis of the thus determined pull-out.