Monitoring and Measuring on Performances of High Pre-Tensioned Full Length Anchoring Bolt

With an improvement on the conventional force measuring bolt,a CM-200 I type force measuring bolt was developed to monitor and measure the stressed conditions of the high pre-tensioned full length anchoring bolt.A lab rating was conducted.Meanwhile,a torque socket to suitably add the torque to the force measuring bolt was developed and thus a actual performance monitoring and measuring of the high pre-stress full length anchoring bolt could be well conducted.The improved force measuring bolt was applied to the underground mine.The monitoring and measuring results showed that after the pre-tension made,the load on the high pre-tension full length anchoring bolt would be evenly distributed along the bar of the bolt.When the surrounding rock deformed,there would be a neutral point occurred at the 500mm to the bolt real end.A shaft force at the location would be max and the shearing stress would be zero.The support performances of the bolt could be fully played.