Rock bolting performance and field practice in deep roadway with rock burst
(2.Coal Mining and Designing Branch, China Coal Research Institute, Beijing 100013)
(3.State Key Laboratory of Coal Mining and Clean Utilization, Beijing 100013)
(4.Coal Mining and Designing Branch,China Coal Research Institute, Beijing ,China 100013)
(5.State Key Laboratory of Coal Mining and Clean Utilization, Beijing ,China 100013)
【Abstract】The geomechanics parameter distribution features of rocks surrounding a deep roadway with rock burst in the Changcun Coal Mine of Yima coal mining district, China were introduced, and the deformation and damage characteristics and the main affecting factors of rocks surrounding the deep roadway with rock burst were analyzed. The intrinsic actions of rock bolting to roadway deformation with rock burst were revealed, which include keeping the integrity of surrounding rocks, forming bolting stress fields in surrounding rocks, reducing the stress concentration factors, improving stress distribution around surrounding rocks, and enhancing the anti-impact ability. In addition, the principles in selecting roadway support patterns with rock burst were put forward, the mechanical performances of rock bolt materials with high impact toughness, and the design method of rock bolting parameters were explained. The combined support pattern, i.e., taking rock bolts and cables with high strength and high impact toughness, full length encapsulation with pretension as main supports, steel arches as supplementary supports, was presented to support the lower roadway of face 21220 in the Changcun Coal Mine, and the underground test was carried out. The monitoring data pointed out that: the combined support pattern proposed, which unites with surrounding rocks as a whole and has strong anti-impact ability, can effectively control the deformation and damage of rocks surrounding the deep roadway with rock burst. The loading features of rock bolts and cables under the action ofburst energy are different from those in common roadways, which present a wavy or zigzag variation tendency.
【Keywords】 coal mine roadway; rock burst; rock bolting; bolting performance; underground test; coal mine roadway; rock burst; rock bolting; bolting performance; underground test;
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