全长预应力结构防止钻孔瓦斯积聚技术研究

Technology of Preventing Methane Accumulation in Bore-hole with Full-length Pre-stress Sturcture

高瓦斯矿井锚杆锚索孔内高浓度瓦斯积聚,工作面回采过程中由于锚杆锚索各构件在高速旋转过程中相互碰撞或端头支架与锚杆锚索头碰撞产生火花而引燃锚杆锚索孔中高浓度瓦斯造成安全事故。分析了锚杆孔中瓦斯罐的形成及瓦斯燃烧因素,井下实测了锚杆支护巷道中瓦斯含量,并对结果进行了分析。论述了实现全长预应力结构的技术措施,并在井下进行了工业性试验。由于采用了全长预应力结构的锚杆锚索组合支护系统,锚杆与孔壁之间的间隙被锚固剂完全充填,不仅支护效果良好,而且消除了高瓦斯矿井锚杆支护巷道中瓦斯罐的隐患。

In mine with high methane content,high-concentration methane would accumulate in boreholes for anchored bolt and anchored rope.During mining procedure,collision of every component of anchored bolt and anchored rope,or collision of anchored bolt head and head support may ignite methane in boreholes and result in disaster.Methane pot form mechanism and methane combustion factors were analyzed;methane content in roadway supported by anchored bolt was measured and analyzed.Full-length pre-stress structure was introduced to prevent methane disaster and industrial test was made.The gap between bolt and borehole was filled fully by anchored material if applying combined supporting system with full-length pre-stress structure,so the supporting effect was excellent and hidden danger of methane pot was eliminated.