Rock burst hazard determination by using computed tomography technology in deep workface
The rockburst in mines results from the dynamic load coupled with static one in coal seams around workface zones, so it is essential to learn the stress distribution of the coal and surrounding rock for determination of rockburst risk areas. The relationship between the elastic wave velocity and stress applied on coal sample was investigated systematically by laboratory testing, theoretically analysis, as well as on-site observation, and a positive correlation between them under uniaxial compression was put forward. Furthermore, it is drawn that the anomaly of elastic wave velocity reflects the stress changes: the positive anomaly ascertains the stress concentration while the negative anomaly estimates the mining destress and weaken degree, and corresponding assessment criterions and parameters were established respectively. The hazard areas and degree of an island longwall face 16302C were forecasted before coal winning based on the elastic wave anomaly distribution rules using active tremor velocity inversion, monitoring results of mining shocks during exploitation indicate that the consistency between locations of big tremors and where forecasted by computed tomography (CT) exceed 80％. The successful application of this technology achieved remarkable economic and social benefits for disaster control in rock burst mines.
Rockburst Elastic wave CT Welocity anomaly Inversion Verification
Linming Dou Tongjun Chen Siyuan Gong Hu He Shibin Zhang
State Key Laboratory of Coal Resources and Mine Safety, School of Mines, China University of Mining Jining NO.3 Coal Mine of Yanzhou Mining Industry Group, Jining, Shandong 272000, China
国际会议
The First International Symposium on Mine Safety Science and Engineering (首届矿山安全科学与工程学术会议)
北京
英文
1205-1212
2011-10-27（万方平台首次上网日期，不代表论文的发表时间）