Tunnel Relaxation Method for Determining the Initial and Long-term Deformation Around an Underground Opening.
Waddell GG; Crocker TJ; Skinner EH
Proc 12th Symp on Rock Mechanics Rolla Missouri, 1970 Nov; :903-931
This paper describes a method of measuring initial and long-term deformations which occur in the medium surrounding mine accessways and discusses the importance of this type of measurement in assessing support-problem areas. Delineated are (1) description of the rock-deformation monitoring equipment, (2) results of two field tests which monitored rock deformation around 4-foot-diameter raise bores, and (3) a numerical-analysis (finite-element) technique to correlate theoretical with experimental results. Instrumentation developed provided the sensitivity and resolution needed to measure rock deformation around a full-scale raise bore during excavation. Results of the tests conducted at the Lucky Friday Mine, Mullan, Idaho, show the relationships between (1) deformation versus time, and (2) deformation versus bit progress.
Proc. 12th Symp. on Rock Mechanics, Rolla, Missouri, Nov. 16-18, 1970, PP. 903-931