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Gold Science and Technology ›› 2018, Vol. 26 ›› Issue (3): 342-348.doi: 10.11872/j.issn.1005-2518.2018.03.342

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Numerical Simulation and Application Research on Joint Development Rock Roadway Blasting Excavation

WANG Haibo,WEI Guoli,ZONG Qi,XU Ying   

  1. School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,Anhui,China
  • Received:2017-07-31 Revised:2018-01-11 Online:2018-06-30 Published:2018-07-28

Abstract: Geological discontinuities such as joints,weak intercalation and faults are the important factors affecting roadway drifting blasting effect.According to the propagation theory of stress wave in rock mass,taking a coal mine roadway downhill as the engineering background,LS-DYNA software was used to simulate and analyze the excavation blasting of jointed rock mass roadway with inclination angle of 68 degree and width 3 cm,and verify the influence of joints on the propagation of stress wave in theoretical analysis.The results show that the joint surface destroys the integrity of rock mass,and the rock fragmentation on the back side of blasthole is weak,and the rock mass breakup is aggravated by the reflection of joint on the side of the attack. Interval hole of cut holes adopted delay filling structure and ?35 mm explosive are used to increase cut blasting energy,the reasonable layout of blast hole,reduce amount of signal hole charge near the joint surface,and increasing blast hole depth,improve the length and quality of block,prolong the explosion energy function,improve the blasting efficiency.The field application has achieved good results.

Key words: jointed rock mass, roadway, drifting blasting, numerical simulation, blasting efficiency, geological discontinuity surface, stress wave propagation

CLC Number: 

  • TD235
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