Push Test

As can be seen from the test result in Figure 15, the loading capacity of the bolt increased with increased profile spacing. However, the highest loading capacity was achievable with profile spacing of 37.5 mm rather than 50 mm rib profile spacing. The loading of 37.5 mm spaced bolt was halted as the unencapsulated bolt section began to bend. For the indicated final level push load of 425.8 kN shown for 37.5 mm spaced profiled bolt (Bolt Type T2 G2) in Figure 3, this is 7% greater than the maximum load achievable of Bolt Type T2 G3 of 50 mm profile spacing, and is 16% greater than of Bolt T2 G1 of 25 mm profile spacing, as shown in Table 2. The loading capacity of T2 G2 bolt is 97.5 % greater than the original Bolt TypeT2, with 12.5 mm profile spacing. It should be noted that the differences between the load bearing capacity between the 25 mm profile spaced Bolt Types T2 G1 and T3 is attributed to the surface roughness of the Bolt Type T2G1, which was resulted from the removal of the profile from Bolt TypeT2. The effect of bolt surface roughness on the load bearing capacity of a bolt was previously reported by Aziz and Webb (2003). It is also equally true that the variations between the load bearing capacity between Bolt Types T2G2 and T2G3 could have been influenced by the increased surface roughness of Bolt Type T2G3, nevertheless, the bearing capacity of Bolt Type T2G3 is significantly higher than the T2G3.

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