Rapid excavation technology by drilling and blasting and it's application in hard rock roadway

2011 ◽  
Author(s):  
Wen-hua Yuan
Keyword(s):  
Hard Rock ◽  
Rapid Excavation ◽  
Rock Roadway

The Dynamic Effect Analysis of Transient Unloading due to Blasting Excavation in Deep and Hard Rock Roadway

2013 ◽  
Vol 753-755 ◽  
pp. 682-685 ◽  
Author(s):  
Jun Guo ◽  
De Qing Gan ◽  
Jing Tan ◽  
Gui Lin Lv
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Hard Rock ◽  
Dynamic Effect ◽  
Rock Fragmentation ◽  
Effect Analysis ◽  
Dynamic Finite Element ◽  
Blasting Excavation ◽  
Rock Roadway ◽  
Element Method

The dynamic effect analysis of transient unloading is one of main points to the mechanism of rock fragmentation by blasting. The paper introduces the details of rhe effect of instantaneous unloading to rock fragmentation by blasting. Use the dynamic finite element method to calculate the process of transient unloading of excavation; get some conclusions about transient unloading.

scholarly journals Positioning and Sequence Planning of Drilling Boreholes in Hard Rock Roadway

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 56480-56490
Author(s):  
Yuming Cui ◽  
Songyong Liu ◽  
Huifu Ji ◽  
Yuhui Han ◽  
Yueshen Yu
Keyword(s):  
Hard Rock ◽  
Sequence Planning ◽  
Rock Roadway

Roadway Hard Rock Loose Blasting by Digging Machine Technique

2012 ◽  
Vol 204-208 ◽  
pp. 1758-1762 ◽  
Author(s):  
Ju Gen Fu ◽  
Rui Xuan Luan ◽  
Yan Ting Zhang
Keyword(s):  
Service Life ◽  
Hard Rock ◽  
Blast Hole ◽  
Machine Construction ◽  
Engineering Practice ◽  
The West ◽  
Charge Structure ◽  
Hole Depth ◽  
Sandy Mudstone ◽  
Rock Roadway

Rock roadway digging machine is generally applicable to soft mudstone, sandy mudstone roadway. When it comes to the harder rock,, the speed of digging machine construction is greatly reduced, the tool were wear seriously, the service life is substantially reduced, the tunneling cost is dramatic increased. So we must use the loose secondary blasting, to soften rocks. According to the specific circumstances of the west lane in Liuzhuang Coalmine, and proposed coal mine loose blasting technique program in keeping with construction requirements after the study, that is reasonable blast-hole depth, hole parameters, charge amount, charge structure, stemming length. Research results have a good loose blasting effect in engineering practice.

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