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Determination of ejection velocity of rock fragments during rock burst in consideration of damage

  • Zuo Yu-jun Email author
  • Li Xi-bing 
  • Zhou Zi-long 
Article

Abstract

The ejection velocity of rock fragments during rock burst, one of the important indexes representing the rock burst strength, is used most conveniently in the supporting design of tunnel with rock burst tendency and is often determined by means of observation devices. In order to calculate the average ejection velocity of rock fragments theoretically, the energy of rock burst was divided into damage consuming energy and kinetic energy gained by unit volume of rock firstly, and then the rock burst kinetic proportional coefficient ν was brought up which could be determined according to the rock-burst damage energy index WD, at last the expression of the average ejection velocity of rock fragments during rock burst was obtained and one deep level underground tunnel was researched using the mentioned method. The results show that the calculation method is valid with or without considering the tectonic stress of tunnels, and that the method can be a reference for supporting design of deep mining.

Key words

rock burst ejection velocity support design energy equilibrium damage 

CLC number

TU452 

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Copyright information

© Central South University 2005

Authors and Affiliations

  1. 1.School of Resources and Safety EngineeringCentral South UniversityChangshaChina

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