Research on the Catapulted Dynamic Mechanism of Broken Cable-bolt and the Defense Measures
During the extraction process of the top coal caving working face, the fierce looseness, deformation as well as fracture of the surrounding rocks would usually occur because the slots will get strong disturbance. Meanwhile, anchored bolt and cable-bolt shall deform accordingly. When the deformation of the anchored bolt or cable-bolt comes to the extreme extent, they will crack. Then the catapulting and wounding incident will easily happen if the fractural part of the anchored bolt and cable-bolt is not fully griped by the rocks. In the paper, based on the dynamic mechanism analysis on fracture phenomenon about the anchored cable-bolt, the formulas of the kinetic energy and speed of the fractural catapult of the horizontally anchored cables in the ribs and the vertically anchored cables in the roof have been established. And a bolt support theory small pretightening force & large expected anchorage strength has been put forward, which is useful for seriously deformed roadways to prevent anchored cable-bolts from breaking. In addition, a technological method to stop anchored cable-bolt ejecting by means of pipe cap has been put forward.
crossheading cable-bolt fracture catapulting prevention technol
SUN Bo-le YANG Shuang-suo YANG Bo HE Tao
College of Mining Technology, Taiyuan University of Technology, Taiyuan, Shanxi 030024, 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
861-867
2011-10-27（万方平台首次上网日期，不代表论文的发表时间）