Numerical study on the fracturing mechanism of shock wave interactions between two adjacent blast holes in deep rock blasting

Yuan, Wei; Liu, Shangge; Wang, Wei; Su, Xuebin; Li, Zonghong; Li, Jiaxin; Wen, Lei; Chang, Jiangfang; Sun, Xiaoyun

doi:10.1007/s11803-019-0533-6

Cited by 25 publications

(12 citation statements)

References 11 publications

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“…This paper studies the influence of delayed blasting on the permeability enhancement effect by simulating different initiation times of blasting holes to seek the best blasting time. According to field observations and research, the commonly used differential interval time is 15 ~ 75 ms, usually 25 ~ 30 ms 35 , 36 . Considering the actual situation of the Sanyuan coal mine and taking the millisecond time of the high-precision detonator as the standard, the millisecond blasting time is set as 0, 17, 25 and 42 ms, and the numerical model experiment is carried out in four groups.…”

Section: Analysis Of Numerical Simulation Resultsmentioning

confidence: 99%

Study on the technology of enhancing permeability by deep hole presplitting blasting in Sanyuan coal mine

Zhao

Wang

Gao

2021

Sci Rep

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To reduce gas disasters in low permeability and high gas coal seams and improve gas predrainage efficiency, conventional deep hole presplitting blasting permeability increasing technology was refined and perfected. The damage degree of coal and rock blasting was quantitatively evaluated by using the value range of the damage variable D. According to the actual field test parameters of coal seam #3 in the Sanyuan coal mine, Dlim = 0.81 ~ 1.0 was the coal rock crushing area, Dlim = 0.19 ~ 0.81 was the coal rock crack area, and Dlim = 0 ~ 0.19 was the coal rock disturbance area. The blasting models under different blasting parameters were established by ANSYS/LS-DYNA software. The influence radius of single-hole blasting was 3.1 m, the hole diameter of double-hole blasting was 113 mm, the hole spacing was 5.5 m, and the delayed blasting time was 25 ms. According to the numerical simulation results, the determined parameters were tested on the working face of the 1312 transportation roadway in coal seam #3 of the Sanyuan coal mine. The results show that after blasting, the permeability of the original coal seam was increased by more than 30 times, the gas concentration was increased by 2.16 times, and the single hole purity and mixing volume were increased by 4.73 and 4.27 times, respectively. The positive effects of deep hole presplitting blasting permeability enhancement technology on the pressure relief and permeability enhancement of a low pressure and high gas coal seam were determined.

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Section: Analysis Of Numerical Simulation Resultsmentioning

confidence: 99%

Study on the technology of enhancing permeability by deep hole presplitting blasting in Sanyuan coal mine

Zhao

Wang

Gao

2021

Sci Rep

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“…Currently, the means of blasting can provide independent operation of each explosive charge in the bore [7][8][9], that is, using this approach it is possible to optimize the drilling operations parameters and to achieve a significant reduction in the effect of the explosion seismic impact on the protected massif and quarry objects in the joint operation of blasting works on the surface and underground workings within the combined development of the field.…”

Section: Discussionmentioning

confidence: 99%

Limitations on seismic effects of technological explosions in the combined development of the Sarbai deposit

Kutuev

Zharikov

2020

E3S Web Conf.

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The issue of joint production of drilling-and-blasting operations (DBO) is acute in the combined field workings with the condition of underground mining in the edge massif of the pit walls. Normally, the underground mine construction begins with the quarry depth approaching the end marks. In this situation, even if there is any volume for wall cutback, it is very insignificant and blasting works come closely to the limit circuit of the quarry, behind which the protected massif is located and underground workings is supposed to be carried out in the future. The main task in carrying out DBO under such conditions is to maintain the stability of this massif. Timely explosion shielding and the creation of contour fracture surfaces by applying controlled blasting reduce the negative explosion impact on the edge, yet do not always prevent the stress waves spread across the massif caused by seismic effect. Therefore, limiting the explosion seismic action in the border zone is as important for the massif stability as the professional pre-splitting.

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“…is paper studies the influence of delayed blasting on the permeability enhancement effect by simulating the different initiation times of blasting holes to seek the best millisecond blasting time. According to field observations and research, the commonly used differential interval time is 15-75 ms, usually 25-30 ms [20,21]. Considering the actual situation of the Sanyuan coal mine and taking the millisecond time of the high-precision detonator as the standard, the millisecond blasting time is set as 0, 17, 25, and 42 ms, and the numerical model experiment is carried out in four groups.…”

Section: Simulation Analysis On Delay Time Optimization Of Millisecond Blastingmentioning

confidence: 99%

Study on the Technology of Enhancing Permeability by Millisecond Blasting in Sanyuan Coal Mine

Zhao

Wang

Gao

2021

Mathematical Problems in Engineering

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To reduce gas disasters in low permeability and high-gas coal seams and improve gas predrainage efficiency, conventional deep-hole presplitting blasting permeability increasing technology was refined and perfected. The numerical calculation model of presplitting blasting was established by using ANSYS/LS-DYNA numerical simulation software. The damage degree of coal and rock blasting was quantitatively evaluated by using the value range of the damage variable D. According to the actual field test parameters of coal seam #3 in the Sanyuan coal mine, Dlim = 0.81–1.0 was the coal rock crushing area, Dlim = 0.19–0.81 was the coal rock crack area, and Dlim = 0–0.19 was the coal rock disturbance area. By comparing and analysing the damage distribution nephogram of coal and rock mass under the influence of different millisecond blasting time interval and the blasting effect of simulation model, the optimal layout parameters of multilayer through cracks were obtained theoretically. And, the determined parameters were tested on the working face of the 1312 transportation roadway in coal seam #3 of the Sanyuan coal mine. The permeability effect was compared and analysed through the analysis of the gas concentration, gas purity, and mixing volume before and after the implementation of deep-hole presplitting blasting antireflection technology, as well as the change of gas pressure, attenuation coefficient, permeability coefficient, and other parameters between blasting coal seams. The positive role of millisecond blasting in reducing pressure and increasing permeability in low permeability and high-gas coal seam were determined.

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Numerical study on the fracturing mechanism of shock wave interactions between two adjacent blast holes in deep rock blasting

Cited by 25 publications

References 11 publications

Study on the technology of enhancing permeability by deep hole presplitting blasting in Sanyuan coal mine

Study on the technology of enhancing permeability by deep hole presplitting blasting in Sanyuan coal mine

Limitations on seismic effects of technological explosions in the combined development of the Sarbai deposit

Study on the Technology of Enhancing Permeability by Millisecond Blasting in Sanyuan Coal Mine

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