Department of Mining and Design, Tiandi Science and Technology Company Limited

针对煤矿井下锚索的锚具出现退锚等锚固不可靠的现象,为得到锚具退锚原因,提高锚索锚固可靠性,采用力学分析、试验分析等方法得出锚具退锚的主要因素,并初步调研了国内煤矿锚索的主要材料。分析结果表明锚索与夹片硬度差不合理、锚索直径误差偏大、锚索强度和硬度偏大、限位距离不合理和锚具质量差是影响锚固可靠性的主要因素。由此得出,降低退锚概率、提高锚索的可靠性的有效参考指标为锚索夹片硬度差大于HRC10,锚索直径误差不超过±0.400.20mm,锚索实际强度低于其抗拉强度和限位距离等于夹片外露距离与锚具回缩距离的和。

According to the phenomena of the anchoring slippage and other unreliable anchoring occurred in the anchoring device of the anchor in underground mi ne, in order to get the slippage causes of the anchoring device and to improve the anchoring relibility of the anchor, the dynamics analysis, lab analysis method and ot her 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 invest igated. The analysis results showed that hardness difference between the anchor and shim irrational, diameter error of the anchor too high, strength and hardness of th e 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 HRC1 0, 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.

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)；