深部岩体在掏槽爆破过程中的损伤演化机制

Translated title of the contribution: Damage evolution mechanism of deep rock mass in process of cut blasting

Lixiang Xie, Wenbo Lu, Qinghui Jiang, Qianbing Zhang, Gaohui Wang, Ming Chen, Peng Yan

Research output: Contribution to journalArticleResearchpeer-review

5 Citations (Scopus)

Abstract

For the purpose of research on the damage evolution mechanism of deep rock mass in the process of cut blasting, a coupled model between the Cowper-Symonds hardening model and tension-compression damage model was implemented into commercial software LS-DYNA to simulate the damage evolution mechanism of deep rock mass in the process of cut blasting. The numerical results show that the in-situ stress and existence of free surface have an influence on the damage evolution mechanism of deep rock mass in the process of cut blasting. Since the in-situ stress exerts the resistance on the pressure load induced by blasting load in the rock mass, the damage scope of the rock mass surrounding the cut holes is influenced accordingly, and the damage scope decreases with the increase of the in-situ stress. However, in the process of cut blasting, the center hole as a free surface can enlarge the damage scope surrounding the cut holes. That is because the stress waves change into tensile stress waves upon the reflection at the free surface, here, and the tensile damage caused by tensile stress waves at the free surface propagates toward the inner rock mass, and eventually the damage scope of the rock mass surrounding the cut holes is enlarged.

Translated title of the contributionDamage evolution mechanism of deep rock mass in process of cut blasting
Original languageChinese
Pages (from-to)1252-1260
Number of pages9
JournalJournal of Central South University (Science and Technology)
Volume48
Issue number5
DOIs
Publication statusPublished - 26 May 2017

Keywords

  • Cut blasting
  • Damage scope
  • Deep rock mass
  • In-situ stress
  • Resistance
  • Tension-compression damage model

Cite this