The Efficiency of Large Hole Boring (MSP) Method in the Reduction of Blast-Induced Vibration
Abstract
:1. Introduction
2. Project Description
2.1. Introduction to MSP Method
2.2. Characteristics of the MSP Method
3. Comparison of Blasting Efficiency by Size of Empty Hole
4. Real-Scale Test Blasting
4.1. Overview of Test Blasting
4.2. Results of Test Blasting
4.3. Results of PPV Histories
5. Discussion
5.1. Analysis of Vibration-Increasing Factors
5.2. Analysis of Propagation Characteristics of Blast-Induced Vibration
5.3. Effects of MSP Method on Vibration Reduction
6. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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General Blasting (B) | Single-MSP | Multi-MSP | |
---|---|---|---|
Site image | | | |
Number of initial free faces | 0 or 1–3 (Small scale) | 1 (Large scale) | 2–3 (Extremely large scale) |
Characteristics |
|
|
|
Application target areas |
|
|
|
Specification | Description |
---|---|
Name | Minimate Plus (Instantel Inc.) |
Range | Up to 254 mm/s |
Resolution | 0.127 or 0.0159 mm/s with built-in preamp |
Accuracy | 5% or 0.5 mm/s |
Frequency range | 2 to 250 Hz |
Sampling rate | 1024 to 16,000 S/s per channel |
Pattern B | Pattern CB-1 | Pattern CB-2 | Pattern CB-3 | Pattern CB-4 | |
---|---|---|---|---|---|
Cut method | Cylinder-cut (2 holes) | Cylinder-cut (2 holes) | Single-MSP (1 hole) | Single-MSP (1 hole) | Multi-MSP (3 holes) |
Controlled blasting method | Smooth blasting | Combined CB | Combined CB | Combined CB | Combined CB |
Explosives | Emulsion | Emulsion | Emulsion | Emulsion | Low-vibration explosive |
Detonator | Non-electric | Non-electric | Non-electric | Non-electric | Non-electric |
Advance (m) | 2.0 | 2.0 | 2.0 | 1.0 | 0.8 |
Blast hole depth (m) | 2.2 | 2.2 | 2.2 | 1.1 | 1.0 |
Charge per delay (kg/hole) | 1.20 | 1.20 | 1.20 | 0.375 | 0.24 |
Number of LD holes | - | 32 | 37 | 37 | 37 |
Spacing of contour holes (m) | 0.55 | 0.4 | 0.4 | 0.4 | 0.4 |
Number of blast holes | 158 | 210 | 211 | 235 | 323 |
Total charge (kg) | 159.70 | 178.10 | 176.60 | 68.325 | 69.880 |
Name | Manufacturer | Diameter (mm) | Velocity of Detonation (m/s) | Density (g/cc) | Heat of Explosion (kcal/kg) | Gas Quantity (ℓ/kg) |
---|---|---|---|---|---|---|
NewMite Plus | Hanhwa corp. | 32 | 5700 | 1.1–1.2 | 880 | 950 |
Finex | 17 | 4400 | 1.0 | 800 | 850 |
No. | Cut Method | Peak Particle Velocity (PPV, ) | Vibration Reduction Rate (%) Compared with B | |||||
---|---|---|---|---|---|---|---|---|
No. 1 | No. 2 | No. 3 | Min. | Max. | Ave. | |||
1 | B | 0.468 | 1.260 | 0.624 | 0.468 | 1.260 | 0.784 | - |
2 | CB-1 | 0.495 | 0.838 | 0.637 | 0.495 | 0.838 | 0.657 | ▼ 16.20 |
3 | CB-2 | 0.868 | 1.080 | 1.480 | 0.868 | 1.480 | 1.143 | ▲ 45.79 |
4 | CB-3 | 0.327 | 0.592 | 0.505 | 0.327 | 0.592 | 0.475 | ▼ 39.41 |
5 | CB-4 | 0.241 | 0.160 | 0.252 | 0.160 | 0.252 | 0.218 | ▼ 72.19 |
Group | Type | Parameter | Degree of Effect | ||
---|---|---|---|---|---|
Severe | Moderate | Mild | |||
Geological conditions | Uncontrollable variables | Distance between blasting point and structures | ○ | ||
Overburden | ○ | ||||
Topography and stratum | ○ | ||||
Rock condition | ○ | ||||
Atmospheric condition | ○ | ||||
Blasting conditions | Controllable variables | Type of explosive | ○ | ||
Charge per delay | ○ | ||||
Delay time of detonation | ○ | ||||
Drilling angle | ○ | ||||
Burden and hole spacing | ○ | ||||
Stemming conditions | ○ | ||||
Primer position | ○ | ||||
Charge weight | ○ |
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Kim, M.S.; Lee, S.S. The Efficiency of Large Hole Boring (MSP) Method in the Reduction of Blast-Induced Vibration. Appl. Sci. 2021, 11, 1814. https://doi.org/10.3390/app11041814
Kim MS, Lee SS. The Efficiency of Large Hole Boring (MSP) Method in the Reduction of Blast-Induced Vibration. Applied Sciences. 2021; 11(4):1814. https://doi.org/10.3390/app11041814
Chicago/Turabian StyleKim, Min Seong, and Sean Seungwon Lee. 2021. "The Efficiency of Large Hole Boring (MSP) Method in the Reduction of Blast-Induced Vibration" Applied Sciences 11, no. 4: 1814. https://doi.org/10.3390/app11041814