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《Coal Science and Technology》 2014-12
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Research on Slippage Mechanism of Single Anchoring Device in Mine Small Diameter Pre-Stress Anchor

CHU Xiao-wei;JU Wen-jun;WU Yong-zheng;Department of Mining and Design,Tiandi Science and Technology Company Limited;  
According to the phenomena of the anchoring slippage and other unreliable anchoring occurred in the anchoring device of the anchor in underground mine,in order to get the slippage causes of the anchoring device and to improve the anchoring reliability of the anchor,the dynamics analysis,lab analysis method and other methods were applied to get the main factors of the anchor device slippage and the major materials of the anchors applied to the coal mine were preliminarily investigated. The analysis results showed that hardness difference between the anchor and shim irrational,diameter error of the anchor too high,strength and hardness of the anchor too high,critical distance irrational and anchoring device quality poor would be main factors to influence the reliability of the anchoring. Therefore,an effective reference index to reduce the slippage probability and to improve the reliability of the anchor should have hardness difference between the anchor and shim over HRC10,the anchor diameter error should not be over ±0. 400. 20 mm,the actual strength of the anchor should be lower than the tensile strength and aspace limited distance should be a shim exposed distance plus a retuned distance of the anchoring device.
【Fund】: 国家自然科学基金资助项目(U1261211);; 天地科技开采设计事业部科技创新基金资助项目(KCSJ-SCLZH-2012-01)
【CateGory Index】: TD353
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