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Gold Science and Technology ›› 2019, Vol. 27 ›› Issue (5): 747-754.doi: 10.11872/j.issn.1005-2518.2019.05.747

• Mining Technology and Mine Management • Previous Articles     Next Articles

Water-uncouple Charge Blasting Technology for Diphead Roadway in Coalmine

Haixu WANG(),Qi ZONG(),Haibo WANG,Mengxiang WANG   

  1. School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,Anhui,China
  • Received:2018-09-29 Revised:2018-12-07 Online:2019-10-31 Published:2019-11-07
  • Contact: Qi ZONG E-mail:2404151101@qq.com;qzong@aust.edu.cn

Abstract:

The drilling and blasting method of the downhill roadway in China is mostly shallow hole blasting.So during the process of drilling and blasting in the downhill roadway of the coal mine,the utilization of the blasthole is low,the cycle footage is small,the meteorite accumulation after the explosion is head-on,the bottoming phenomenon is serious,and the forming quality of the surrounding part of the roadway is low,greatly affecting the tunneling speed.In order to improve the energy utilization rate and blasting rock breaking effect of the permitted explosives in the third-class coal mine,and to ensure the working efficiency of the mining area,the uncoupling charge structure was optimized,and the air uncoupling and water uncoupling were respectively obtained from the theoretical derivation.The uncoupling charge structure was optimized,and the effects of air uncoupling and water uncoupling charge coefficient on the quasi-static pressure of the explosive gas were obtained by theoretical derivation,and comparative analysis was carried out.Through the laboratory blasting model test,the propagation characteristics of the explosion stress wave under the action of water and air radial uncoupling were studied respectively.The relationship between the peak stress and the proportional distance and the uncoupling coefficient of the measuring point was analyzed,which is verified by theoretical analysis.The results show that the peak value of the explosion stress wave of the water uncoupled charge at the blasthole is higher than that of the air uncoupled charge when the uncoupling coefficient is the same.As the uncoupling coefficient increases,the peak stress of the explosion stress wave at the blasthole decreases.The peak stress of the water uncoupled charge of the same measuring point is 1.15~1.52 times of the peak stress of the air uncoupled charge.The peak stress action time of the water uncoupled charge is longer than the air uncoupled charge.The obtained stress wave and its peak stress are attenuated by the negative power function with the increase of the uncoupling coefficient,and the attenuation of the air uncoupled charge is faster,which is consistent with the theoretical analysis.The water uncoupled charge structure was used for the blasting of the underground tunnel of the coal mine,and achieved a good blasting effect. In the downhill roadway of a coal mine in Guizhou,the conventional air uncoupled charging structure grooving was carried out on the trapezoidal tunneling section.,and the effect was not satisfactory.The water uncoupled charge blasting technology was used to improve the utilization of the blasthole and reduce the rock fragmentation degree,the explosion of the pile,significantly improve the rock crushing effect and slagging efficiency.

Key words: coal mine diphead roadway, excavation blasting, water-uncouple charge, blasting stress wave, decouple coefficient, model test

CLC Number: 

  • TD853

Table 1

Physical mechanical parameters of concrete model"

参数数值参数数值
密度/(kg·m-32横波波速/(m·s-12 086
动态弹性模量/GPa24.7抗压强度/MPa28.86
泊松比/μ0.23抗拉强度/MPa1.60
纵波波速/(m·s-13 788

Fig.1

Schematic diagram of strain gauge layout and concrete model"

Fig.2

Stress wave shape diagram of Φ12 mm decouple charge"

Table 2

Stress wave peak value test results"

炮孔直径/ mm不耦合系数Kd距离炮孔中心不同距离处的测点压力/MPa
20 mm80 mm140 mm200 mm
空气空气空气空气
101.67139.4160.9105.9129.089.2112.070.298.0
122.00100.0138.586.0121.864.097.160.082.0
142.3382.1112.870.492.356.085.554.070.0
162.6773.895.158.380.446.670.342.857.5

Fig.3

Attenuation curve of stress peak value with borehole distance"

Fig.4

Attenuation curve of stress peak value with uncoupled coefficient"

Fig.5

Excavation effect diagram of water decoupling charge blasting in downhill roadway"

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