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Evaluation on load transfer along the length of fully encapsulated rock bolts, based on installation parameters

Conference Paper


Abstract


  • The reinforcement quality of the fully resin encapsulated bolt depends on several factors, which are a combination of the bolt design configuration, bolt/hole diameter ratio and installation procedure. A total of ten bolts were installed into 1.7 m long threaded steel pipes with different resin spin times. The pipes were retrieved from the installed holes in an underground mine road way roof and then cut into 100 mm long sections. the encapsulated bolts in the tube sections were then push tested. Significant variations were found in bond strength along the installed bolt length in the whole tube, with typically the top 200 mm length of bolt being significantly lower (50%) in most cases due to gloving. Additional four more encapsulated bolts in steel tubes were subsequently tested with 50 mm free space above the top of the bolt. The existence of 50 mm spacing enabled better bot anchorage at the bolt top end, with finger gloving being accumulated at the 50 mm over drilled spacing.

UOW Authors


  •   Hillyer, James (external author)
  •   Moslemi, Arash (external author)
  •   Field, S (external author)
  •   Ma, Shuqi (external author)
  •   Aziz, Naj I.
  •   Nemcik, Jan A.

Publication Date


  • 2014

Citation


  • Aziz, N., Nemcik, J., Ma, S., Field, S., Hillyer, J. & Moslemi, A. (2014). Evaluation on load transfer along the length of fully encapsulated rock bolts, based on installation parameters. Sixth International Symposium, High Performance Mining (pp. 221-230). Germany: AIMS.

Abstract


  • The reinforcement quality of the fully resin encapsulated bolt depends on several factors, which are a combination of the bolt design configuration, bolt/hole diameter ratio and installation procedure. A total of ten bolts were installed into 1.7 m long threaded steel pipes with different resin spin times. The pipes were retrieved from the installed holes in an underground mine road way roof and then cut into 100 mm long sections. the encapsulated bolts in the tube sections were then push tested. Significant variations were found in bond strength along the installed bolt length in the whole tube, with typically the top 200 mm length of bolt being significantly lower (50%) in most cases due to gloving. Additional four more encapsulated bolts in steel tubes were subsequently tested with 50 mm free space above the top of the bolt. The existence of 50 mm spacing enabled better bot anchorage at the bolt top end, with finger gloving being accumulated at the 50 mm over drilled spacing.

UOW Authors


  •   Hillyer, James (external author)
  •   Moslemi, Arash (external author)
  •   Field, S (external author)
  •   Ma, Shuqi (external author)
  •   Aziz, Naj I.
  •   Nemcik, Jan A.

Publication Date


  • 2014

Citation


  • Aziz, N., Nemcik, J., Ma, S., Field, S., Hillyer, J. & Moslemi, A. (2014). Evaluation on load transfer along the length of fully encapsulated rock bolts, based on installation parameters. Sixth International Symposium, High Performance Mining (pp. 221-230). Germany: AIMS.