Stress wave propagation in supporting bolts:A test for bolt support quality  

作　　者：Wu Rui Xu Jinhai Li Chong Zhou Baojing Ma Qianqian Wang Zhongliang 

机构地区：[1]State Key Laboratory of Coal Resources and Mine Safety,School of Mines,China University of Mining&Technology,Xuzhou 221008,China [2]Mining and Construction Department,Jiangxi Polytechnic College,Pingxiang 337055,China

出　　处：《International Journal of Mining Science and Technology》2012年第4期567-571,共5页矿业科学技术学报（英文版）

基　　金：provided by the National Natural Science Foundation of China (No. 50874104);the Scientific Research Industry Promotion Project of Jiangsu Province of China(No. JH07-023)

摘　　要：A test method for the non-destructive determination of bolt length,anchoring length,and bolt body force is described.This addresses the problems of low accuracy,limited number of data,and untimely warning signs encountered with existing test methods.Numerical simulations of the bolt,resin,and rock system show that the length accuracy when using the velocity wave is lower than when using the acceleration wave.It is accepted practice to use the acceleration wave for length tests because of improved signal to noise ratios of the waveforms.Laboratory and in situ underground tests showed that the precision of the measurements meets field requirements.Using this method the anchor properties of each single bolt and,thus,the safety of the entire roadway support may be evaluated.A test method for the non-destructive determination of bolt length, anchoring length, and bolt body force is described. This addresses the problems of low accuracy, limited number of data, and untimely warning signs encountered with existing test methods. Numerical simulations of the bolt, resin, and rock system show that the length accuracy when using the velocity wave is lower than when using the acceleration wave. It is accepted practice to use the acceleration wave for length tests because of improved signal to noise ratios of the waveforms. Laboratory and in situ underground tests showed that the precision of the measurements meets field requirements. Using this method the anchor properties of each single bolt and, thus, the safety of the entire roadway support may be evaluated.

关 键 词：Stress waveNon-destructive testingSupporting effectStability evaluation 

分 类 号：TU435[建筑科学—岩土工程] TH131.3[建筑科学—土工工程]