Application of Loose Blasting in Fully-Mechanized Coal Face Crossing Faults

Li, Wenyuan; Yang, Ren Shu

doi:10.4028/www.scientific.net/amr.838-841.1880

Cited by 5 publications

(4 citation statements)

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“…Permeability enhancement is currently the most effective and economical gas drainage technology. Scholars have proposed measures such as presplitting blasting 8 , hydraulic fracturing 9 , liquid CO 2 fracturing 10 , and loose blasting 11 , 12 for improving permeability enhancement. Loose blasting is most widely used among them.…”

Section: Introductionmentioning

confidence: 99%

Study on parameter optimization of deep hole cumulative blasting in low permeability coal seams

Zhao

Shen

et al. 2022

Sci Rep

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Coal seam gas extraction is an important means of exploiting and utilizing gas resources, as well as a means of preventing coal mine disasters. To improve gas extraction efficiency in high gas and low permeability coal seams while ensuring blasting security, deep hole cumulative blasting parameters were optimized. ANSYS/LS-DYNA software is used to establish a 3-dimensional cumulative blasting model. By comparing and analyzing the blasting stress nephograms, stress time-history curves, and crack expansion curves, the optimal blasthole diameter, charge position, and charge length are obtained. Based on the numerical simulation results, a field test was carried out in the No. 10 coal seam of the Pingdingshan coal mine. The test results show that after cumulative blasting, the gas concentration was increased by an average of 2.25 times, the gas purity was increased by an average of 3.78 times, the permeability coefficient of the coal seam was increased by 21 times, and the effective radius of blasting was up to 7 m. The positive effects of deep hole cumulative blasting parameter optimization on the pressure relief and permeability enhancement of a high gas and low permeability coal seam were determined, which can provide a reference for other similar working faces to implement this technology.

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Section: Introductionmentioning

confidence: 99%

Study on parameter optimization of deep hole cumulative blasting in low permeability coal seams

Zhao

Shen

et al. 2022

Sci Rep

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“…Loose blasting is most widely used among them. e conventional blasting technology often encounters the difficult problem that the coal seam fracture development is not good or the coal pulverization is serious [6]. In order to improve the utilization rate of explosive, the cumulative blasting technology is proposed.…”

Section: Introductionmentioning

confidence: 99%

“…Stress-time curves of coal elements at different distances (β is the radial decoupling coefficient) 6. Advances in Civil Engineering are, respectively, 45 meters and 10 meters deep.…”

mentioning

confidence: 99%

Study on the Decoupled Charge Effect in Deep‐Hole Cumulative Blasting of Coal Seam

Song

Guo

et al. 2019

Advances in Civil Engineering

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Five models of cumulative blasting are established by using ANSYS/LS-DYNA to study the effect of decoupling coefficient on cumulative blasting to improve coal seam permeability. The formation and migration process of the shaped energy jets with two kinds of decoupling coefficient are compared and analyzed; also, the propagation of explosive stress waves is represented. The result showed that the air in the blast hole is the key to the formation and migration of the condensing jet. The air in the hole also could reduce the attenuation of stress wave in a certain range. However, if the decoupling coefficient is too large, the air in the hole will consume excessive explosive energy, which is also not conducive to energy transfer. Therefore, there is an optimum decoupling coefficient which can minimize the coal crushing area, increase the coal fissure area, and improve the gas extraction rate. Besides, the cumulative blasting tests were carried out in a coal seam. The test results show that decoupling charge could effectively improve coal seam permeability, and the blasting effect was better when the decoupling coefficient is between 1.67 and 2.

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“…The mining industry, especially the open-pit mining, are encountering many challenges, such as the proper waste disposal and improvement in efficiency [1]- [4]. Loose blasting to break coal and rock is one of the important ways of efficient mining in open pit coal mine [5]. In the mining process, fragmentation of coal and rock is an important index for evaluating blasting effect.…”

Section: Introductionmentioning

confidence: 99%

Distribution Characteristics of Fragments Size and Optimization of Blasting Parameters Under Blasting Impact Load in Open-Pit Mine

et al. 2019

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The size distribution characteristics of fragments formed after loose blasting in open-pit mine will directly affect the economic benefits of the mining enterprise. The impact load test of coal samples with pressure ranging from 0.13MPa to 2.0MPa was carried out by using the split Hope Pressure Bar Test System (SHPB). Based on the theory of stress wave attenuation, the relationship between blasting load and coal samples impact test in the laboratory is established. It is concluded that with the increase of impact pressure, the degree of coal samples breakage increases gradually. According to the requirement of blasting quality in open-pit mine, it is concluded that the impact pressure range with good crushing effect is 0.30MPa ≤ P ≤ 0.90MPa. Based on image recognition method, the fragmentation distribution characteristics of loose deposits of coal seam blasting in open-pit mine are obtained. Combining the impact load test in the laboratory and the fragmentation distribution of coal seam blasting, the influence area of blasting impact fragmentation is divided. According to the research results, two optimization schemes of blasting parameters are put forward and the blasting effect of the two schemes is verified by numerical simulation using ANSYS/LSDYNA. Through field blasting optimization test in open-pit mine, it is concluded that increasing blasting hole spacing and row spacing can effectively control dust pollution and increase massive coal rate.INDEX TERMS Open-pit mine, fragments size distribution, impact load, numerical simulation, blasting optimization.

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Application of Loose Blasting in Fully-Mechanized Coal Face Crossing Faults

Cited by 5 publications

References 0 publications

Study on parameter optimization of deep hole cumulative blasting in low permeability coal seams

Study on parameter optimization of deep hole cumulative blasting in low permeability coal seams

Study on the Decoupled Charge Effect in Deep‐Hole Cumulative Blasting of Coal Seam

Distribution Characteristics of Fragments Size and Optimization of Blasting Parameters Under Blasting Impact Load in Open-Pit Mine

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