Research on Rock Bolt Pull-out Tests in 1000-meter Deep Mining Area
In view of the lack of evaluation of bolt support effect in 1000-meter mining area,by use of the self-developed bolt intelligent pull-out test system,two deep slit weldge tubing bolts are selected for pull-out tests,the variation laws of bolt pull-out force at different lengths and positions are obtained,and the corresponding support suggestions are given.The research shows that the anchoring force of 1.3 m rock bolt is about 25 kN and that of 1.8 m rock bolt is about 33 kN.In deep mining area,1.8 m and above rock bolts should be preferred as supports;The anchoring force at different locations varies greatly,and it is speculated to be caused by the different rock mass qualities at different locations.The research on rock mass quality classification in the mining area should be strengthened,and the bolt support parameters should be further optimized according to the classification results.
kilometer mining depthslit weldge tubing boltpull-out testsupport evaluation
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维普
