scholarly journals Evaluation of drill and blast excavation quality for a tunnel

2021 ◽  
Vol 861 (4) ◽  
pp. 042059
Author(s):  
Jianxiu Wang ◽  
Fan Wu ◽  
Xiaobo Zhou ◽  
Lisheng Hu
Keyword(s):  
Drill And Blast

scholarly journals The Efficiency of Large Hole Boring (MSP) Method in the Reduction of Blast-Induced Vibration

2021 ◽  
Vol 11 (4) ◽  
pp. 1814
Author(s):  
Min Seong Kim ◽  
Sean Seungwon Lee
Keyword(s):  
Urban Areas ◽  
Cost Effective ◽  
Base Case ◽  
Large Hole ◽  
Promising Alternative ◽  
Geological Information ◽  
Drill And Blast ◽  
Smooth Blasting ◽  
Alternative Designs ◽  
Blasting Method

Drill and blast is the most cost-effective excavation method for underground construction, however, vibration and noise, induced by blasting, have been consistently reported as problems. Cut blasting has been widely employed to reduce the blast-induced problems during underground excavation. We propose that the large hole boring method using the state-of-the-art MSP (Multi-setting smart-investigation of the ground and pre-large hole boring) machine (“MSP method”) can efficiently improve vibration reduction. The MSP machine will be used to create 382 mm diameter empty holes at the tunnel cut area for this purpose. This study assessed the efficiency of the MSP method in reducing blast-induced vibration in five blasting patterns using a cylinder-cut, which is a traditional cut blasting method. The controlled blasting patterns using the MSP method demonstrated up to 72% reduction in blast-induced vibration, compared to the base case, Pattern B, where only cylinder-cut and smooth blasting method were applied. Therefore, the MSP method proves to be a promising alternative for blasting in sensitive urban areas where non-vibration excavation techniques were initially considered. Geological characteristics of 50 m beyond the excavation face can be acquired through the proposed real-time boring data monitoring system together with a borehole alignment tracking and ground exploration system. The obtained geological information will be a great help in preparing alternative designs, and scheduling of construction equipment and labour during the tunnel construction.

Drill and blast

2021 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Scott Donald ◽  
Michael P. Love ◽  
Basem Elbarouni
Keyword(s):  
Drill And Blast

scholarly journals A Comparative Analysis of Rock Fragmentation using Blast Prediction Results

2019 ◽  
Vol 19 (1) ◽  
pp. 49-58
Author(s):  
G. Agyei ◽  
M. Owusu-Tweneboah
Keyword(s):  
Comparative Analysis ◽  
Strength Index ◽  
Drilling Parameters ◽  
Hole Charge ◽  
Powder Factor ◽  
Blast Parameters ◽  
Principle Of Proportionality ◽  
Economic Indices ◽  
Drill And Blast ◽  
The Cost

This work presents prediction and optimisation of controllable parameters of drilling and blasting currently used at the Fobinso Pit of Perseus Mining Ghana Limited (PMGL). The mine faces challenges with blast particle sizes produced after primary blasting. The presence of boulders requires secondary fragmentation to further reduce the broken materials to the acceptable sizes, thereby increasing the cost of production. The mechanical properties of the rocks were determined using Protodyakonov Rock Strength Index. The drill and blast parameters were estimated using the Konya and Walter (1990), Principle of Proportionality, and Instituto Geologo Minero de España (IGME) model developed in 1987. The Modified Kuz-Ram model was used to predict and analyse the results of blasting based on the parameters such as spacing, burden, drillhole diameter, charge density, charge per hole, charge length, and powder factor. A comparative analysis of the predicted size distributions of the various models using diameters of 65 mm and 110 mm revealed no significant differences between the size fractions. The Principle of Proportionality produced the best technical and economic indices for blasting. Keywords: Fragmentation, Drilling Parameters, Primary Blasting, Models, Secondary Blasting

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