Comprehensive assessment on dynamic roof instability under fractured rock mass conditions in the excavation disturbed zone  

作　　者：Xing-ping Lai Fen-hua Ren Yong-ping Wu Mei-feng Cai 

机构地区：[1]Energy School, Xi＇an University of Science ＆ Technology, Xi＇an 710054, China [2]School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China [3]Key Laboratory of Western Mine ＆ Hazard Prevention, China Ministry of Education, Xi＇an 710054, China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2009年第1期12-18,共7页矿物冶金与材料学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.10402033 and No.10772144)

摘　　要：The damage process of fractured rock mass showed that the fracture in rocks induced roof collapse in Yangchangwan Coal Mine, China. The rock mass was particularly weak and fractured. There occurred 6 large-scale dynamical roof falls in the excavation disturbed zone （EDZ） with the collapsing volume of 216 m^3. First, the field detailed geological environment, regional seismic dynamics, and dynamic instability of roadways were generally investigated. Second, the field multiple-index monitoring measurements for detecting the deep delamination of the roof, convergence deformation, bolt-cable load, acoustic emission （AE） characteristic parameters, total AE events, AE energy-releasing rate, rock mass fracture, and damage were arranged. Finally, according to the time-space-strength relations, a quantitative assessment of the influence of rock-mass damage on the dynamic roof instability was accomplished.The damage process of fractured rock mass showed that the fracture in rocks induced roof collapse in Yangchangwan Coal Mine, China. The rock mass was particularly weak and fractured. There occurred 6 large-scale dynamical roof falls in the excavation disturbed zone （EDZ） with the collapsing volume of 216 m^3. First, the field detailed geological environment, regional seismic dynamics, and dynamic instability of roadways were generally investigated. Second, the field multiple-index monitoring measurements for detecting the deep delamination of the roof, convergence deformation, bolt-cable load, acoustic emission （AE） characteristic parameters, total AE events, AE energy-releasing rate, rock mass fracture, and damage were arranged. Finally, according to the time-space-strength relations, a quantitative assessment of the influence of rock-mass damage on the dynamic roof instability was accomplished.

关 键 词：fractured rock mass excavation disturbed zone （EDZ） roof collapse acoustic emission （AE） quantitative assessment 

分 类 号：TD863[矿业工程—金属矿开采] TV223.1[矿业工程—矿山开采]