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A platform for research: civil engineering, architecture and urbanism
A Novel Method of Combined Deep Hole Blasting for Gob-Side Roadway Protection
Abstract With the deterioration of mining conditions, the stability of roadway has become an important research topic for safe and efficient production in coal mines. To protect the gob-side roadway from dynamic mining disturbance under the condition of thick and hard roof so as to ensure the stability of roadway, an innovative method of combined deep hole blasting (CDHB) is proposed. The CDHB method consists of directional energy-gathering blasting and non-directional blasting. By means of theoretical analysis, numerical simulation and field test, the mechanism and effect of the method to protect roadway are analyzed. The research results show that due to the pressure relief principle of the directional energy-gathering blasting technology, the coal mass stress on the side of coal pillar in the roadway is reduced, and the stress concentration area is far away from the roadway. At the same time, owing to the principle of broken expansion filling of non-directional blasting, the collapsed gangue can fill the goaf and support the roof, thus reducing the coal mass stress in front of the working face and at the side of the roadway coal pillar. Finally, the combination of the two blasting methods successfully reduces the coal mass stress of the two sides of the roadway in front of the working face, optimizes the stress environment of the roadway and achieves the goal of protecting the roadway. The effectiveness of the CDHB method is verified by field tests, in which the stress and deformation of the surrounding rock of the roadway are significantly reduced. The research results provide a scientific basis for roadway deformation control under similar conditions.
Highlights A new CDHB method is proposed based on characteristics of rock.Protecting roadway by pressure relieve and increasing coefficient of broken expansion.Comprehensive monitoring showed that CDHB method effectively protects gob-side roadways.
A Novel Method of Combined Deep Hole Blasting for Gob-Side Roadway Protection
Abstract With the deterioration of mining conditions, the stability of roadway has become an important research topic for safe and efficient production in coal mines. To protect the gob-side roadway from dynamic mining disturbance under the condition of thick and hard roof so as to ensure the stability of roadway, an innovative method of combined deep hole blasting (CDHB) is proposed. The CDHB method consists of directional energy-gathering blasting and non-directional blasting. By means of theoretical analysis, numerical simulation and field test, the mechanism and effect of the method to protect roadway are analyzed. The research results show that due to the pressure relief principle of the directional energy-gathering blasting technology, the coal mass stress on the side of coal pillar in the roadway is reduced, and the stress concentration area is far away from the roadway. At the same time, owing to the principle of broken expansion filling of non-directional blasting, the collapsed gangue can fill the goaf and support the roof, thus reducing the coal mass stress in front of the working face and at the side of the roadway coal pillar. Finally, the combination of the two blasting methods successfully reduces the coal mass stress of the two sides of the roadway in front of the working face, optimizes the stress environment of the roadway and achieves the goal of protecting the roadway. The effectiveness of the CDHB method is verified by field tests, in which the stress and deformation of the surrounding rock of the roadway are significantly reduced. The research results provide a scientific basis for roadway deformation control under similar conditions.
Highlights A new CDHB method is proposed based on characteristics of rock.Protecting roadway by pressure relieve and increasing coefficient of broken expansion.Comprehensive monitoring showed that CDHB method effectively protects gob-side roadways.
A Novel Method of Combined Deep Hole Blasting for Gob-Side Roadway Protection
Yang, Jun (author) / Fu, Qiang (author) / Gao, Yubing (author) / Wu, Xing (author) / Chang, Xu (author) / Li, Changjiang (author)
2023
Article (Journal)
Electronic Resource
English
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
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