Development and application of ultrahigh-heat processed rock bolts
In Chinese coal mine industry,most of rock bolts have a low load-bearing capacity and have no requirement for impact absorbing energy.An investigation of broken rock bolts was carried out in underground coal mines and it was found that the major reason of bolt failure was low tensile strength,high inclusion content,lack of impact toughness and impact-bearing capacity.Low impact toughness is the intrinsic reason for bolt broken.To overcome this problem,an ultrahigh-heat processed bolt was developed.The capacity of this type of bolts was evaluated by doing pull-load and twisting tests.The experimental results show that the ultrahigh-heat processed bolts exhibit higher load-bearing capacity comparing to conventional bolts.The coefficient of impact-absorbing energy of the ultrahigh-heat processed bolt is many times higher than that of the conventional bolts.The ultrahigh-heat processed bolts have been used for supporting a roadway subjected to dynamic stresses at Zhangchun Coal Mine in Lu’an.The pre-tension was between 52 to 98 kN and the monitored maximum load was 223 kN which was less than its broken load.The deformation of the roadway was efficiently controlled by the ultrahigh-heat processed bolts.
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Document Type: Research Article
Publication date: February 15, 2015
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