Research on Slippage Mechanism of Single Anchoring Device in Mine Small Diameter Pre-Stress Anchor
CHU Xiao-wei
JU Wen-jun
WU Yong-zheng
Abstract：According to the phenomena of the anchoring slippage and other unreliable anchoring occurred in the anchoring device of the an-chor in underground mine,in order to get the slippage causes of the anchoring device and to improve the anchoring reliability of the an-chor,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 differ-ence 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 effec-tive 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.
Keywords：anchorslippage of anchoring devicepoor hardnessdiameter errorspace limited distance
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 16-19,23 )