NUMERICAL STUDY ON DYNAMIC PERFORMANCE OF END-ANCHORED ROCKBOLT UNDER IMPACT LOADING

Authors

  • CHEN ZHAO COLLEGE OF ENERGY AND MINING ENGINEERING, SHANDONG UNIVERSITY OF SCIENCE AND TECHNOLOGY, QINGDAO 266590, CHINA HTTPS://ORCID.ORG/0000-0002-8766-4883
  • YUBAO ZHANG COLLEGE OF ENERGY AND MINING ENGINEERING, SHANDONG UNIVERSITY OF SCIENCE AND TECHNOLOGY, QINGDAO 266590, CHINA / STATE KEY LABORATORY OF MINING DISASTER PREVENTION AND CONTROL CO-FOUNDED BY SHANDONG PROVINCE AND THE MINISTRY OF SCIENCE AND TECHNOLOGY, SHANDONG UNIVERSITY OF SCIENCE AND TECHNOLOGY, QINGDAO 266590, CHINA HTTPS://ORCID.ORG/0000-0002-1235-1348
  • WENBIN WU CHINA COAL TECHNOLOGY AND ENGINEERING GROUP CHONGQING RESEARCH INSTITUTE, CHONGQING 400039, CHINA HTTPS://ORCID.ORG/0000-0002-9654-2810
  • ZIJIAN ZHANG COLLEGE OF ENERGY AND MINING ENGINEERING, SHANDONG UNIVERSITY OF SCIENCE AND TECHNOLOGY, QINGDAO 266590, CHINA HTTPS://ORCID.ORG/0000-0002-2735-3549
  • TONGBIN ZHAO COLLEGE OF ENERGY AND MINING ENGINEERING, SHANDONG UNIVERSITY OF SCIENCE AND TECHNOLOGY, QINGDAO 266590, CHINA / STATE KEY LABORATORY OF MINING DISASTER PREVENTION AND CONTROL CO-FOUNDED BY SHANDONG PROVINCE AND THE MINISTRY OF SCIENCE AND TECHNOLOGY, SHANDONG UNIVERSITY OF SCIENCE AND TECHNOLOGY, QINGDAO 266590, CHINA HTTPS://ORCID.ORG/0000-0003-2017-7244

DOI:

https://doi.org/10.1590/1679-78256458

Abstract

THE NUMERICAL MODELLING FOR DYNAMIC IMPACT TESTING OF END-ANCHORED ROCKBOLT IS ESTABLISHED IN THIS PAPER. THE DYNAMIC RESPONSE OF ROCKBOLT UNDER IMPACT LOADING CONDITION IS INVESTIGATED CONSIDERING THE EFFECTS OF DIFFERENT IMPACT ENERGY LEVELS, ANCHORING LENGTH, BOLT DIAMETER, AND MATERIAL TYPE. THE RESULTS SHOW THAT THE STRESS CHARACTERISTICS OF THE ANCHORING SECTION IN END-ANCHORED ROCKBOLT COULD BE DIVIDED INTO THREE STAGES WITH THE IMPACT TIME: IMPACT INITIAL STAGE, IMPACT MIDDLE STAGE AND IMPACT FINAL STAGE. THE ELONGATION OF THE ROCKBOLT INCREASES BY ABOUT 30 MM FOR EVERY 5KJ INCREASE IN IMPACT ENERGY. WHEN THE IMPACT ENERGY LEVEL INCREASES, THE ENERGY ABSORPTION RATE AND MAXIMUM PLASTIC STRAIN BOTH INCREASE SIGNIFICANTLY. THE IMPACT ENERGY IS MAINLY DISSIPATED BY THE PLASTIC DEFORMATION OF THE FREE SECTION AND DEBONDING SECTION OF END-ANCHORED ROCKBOLT. THE FREE SECTION PLAYS A BUFFER ROLE THROUGH ITS ELASTIC DEFORMATION WHEN THE ROCKBOLT IS SUBJECTED TO IMPACT LOADING. IT IS REMARKABLE THAT THE ENERGY ABSORPTION RATE AND ANTI-IMPACT PERFORMANCE OF THE END-ANCHORED ROCKBOLT CAN BE IMPROVED BY INCREASING THE BOLT DIAMETER AND THE BOLT MATERIAL STRENGTH.

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Published

2021-03-02

Issue

Vol. 18 No. 3 (2021)

Section

Articles

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