Study on vibration attenuation and damage characteristics of adjacent filling bodies under blasting effects
Source abstract
Abstract
In the two-step mining and filling process, the blasting vibrations from the second-step mining inevitably disturb the filling body from the first step, causing internal damage and potentially leading to the collapse of the filling body. Studying the damage evolution characteristics of the filling body under the influence of blasting is crucial for ensuring the safe production of the mining operation. In this study, blasting vibration tests were conducted underground to calibrate the parameters of the numerical model. An engineering-scale numerical model was developed, with the thickness of the filling body protection layer and the resistance line distance as variables, to investigate the influence of these factors on the damage characteristics of the filling body. The results indicate that the damage evolution process of the filling body can be categorized into four distinct stages: initial accumulation, linear growth, rate decay, and morphological termination. Furthermore, the damage distribution exhibits significant variations; an increase in the thickness of the protection layer results in a transition from interface delamination to a patch damage pattern. Concurrently, extending the resistance line induces a dual effect characterized by deep extension and energy dissipation. The degree of damage to the filling body was quantified using the fractal dimension. The fractal dimension of the filling body’s blast-induced cracks decreased with increasing protection layer thickness, while it generally increased with the extension of the resistance line. The fractal dimension reached its minimum at 2.0 m, and any further increase beyond this value resulted in aggravated damage due to the reflection of stress waves. A damage model for the filling body was established based on the fractal dimension, demonstrating a high degree of fitting accuracy. By analyzing the number of damaged elements in the filling body and the blasting effect on the ore, the study ultimately proposes optimized parameters: when the protective layer thickness is ≤ 2.0 m, the resistance line should be ≤ 2.0 m. Therefore, the rational parameters effectively improve the ore crushing efficiency while reducing the degree of damage to the filling body.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Rock Mechanics and Modeling · Innovative concrete reinforcement materials · Fatigue and fracture mechanics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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