As stated in former sections, the failure forms for a bolting system under pullout test can be divided into two types; they are bolt fracture and interfacial decoupling; now interfacial decoupling is studied in this section.
But the overall curve trend in Figure 9 was multiply determined by mechanical properties of bolt, cement, and bolt-grout (or grout-tube) bonding effects, which sustained an overall stability of bolting system before failure occurred.
After the occurrence of ends detachment between the last segment and the middle segment, the degree of decoupling bilateral the separation and the bolt elongation were vital to overall stability of bolting system.
The rest bonding section between bolt and cement in this segment was not able to sustain the overall stability of bolting system under the circumstance; hence the load rapidly dropped to zero level after the peak load point .
With cable bolting, it is possible to employ more efficient stoping methods, such as sub-level stoping, in relatively poor rock conditions.
The quality of bolting with Cabolt is excellent because there is no possibility for human error.
The advantages of mechanising the cable bolting process are many:
* The cable bolting task is fully controlled through Tamrock's TMS instrumentation.
Bolting only the crest of the bench (Pattern 3) allowed a greater volume of rockfall from the unsecured portion of the bench face and some backbreak.
Differences between movement rates for each area roughly correspond to the degree of bolting in the slope below, but these are not statistically significant.
A bolting program for the remainder of the mine was generated based on geologic cross sections that identified future rock mass conditions.
The bolting and meshing program will continue to play a key role in achieving an aggressive mine design in weak rock.